Montco Bio Placement Test

Suppose one strand of a "mini-gene" has the base sequence TACCCGGATTCA. The last codon in the mRNA sequence will be: A) UGA B) AGT C) AGU D) TCA E) ACT

C

The oxygen we breathe in is used in A) Glycolysis B) Krebs cycle C) Electron Transport System D) Preparatory Step E) Fermentation

C

What bond is (are) easily disrupted in aqueous (water) solutions? A) Covalent B) Polar covalent C) Ionic D) A and B are correct E) A, B, and C are correct

C

What is the significance of the conversion of pyruvate to lactate during fermentation? A) Pyruvate becomes available to enter the mitochondrial matrix B) The citric acid/Krebs cycle is initiated C) NAD+ is regenerated for use in glycolysis D) ATP is produced E) The energy in pyruvate is used up

C

Which does not occur in telophase? A) Cytokinesis is under way B) The nuclear membrane is being reconstructed C) The centromeres split apart D) Chromosomes de-condense into chromatin E) The nucleolus reforms

C

Which kingdom possesses unicellular animal-like species and unicellular plant-like species? A) Fungi B) Animalia C) Protist D) Plant E) Bacteria

C

Which of the classes of RNA molecules carries the genetic information as it is needed for the construction of a protein? A) Ribosomal RNA B) Transfer RNA C) Messenger RNA D) Primary RNA E) Secondary RNA

C

A covalent bond is formed when: A)Two non-polar molecules associate with each other in a polar environment B) A positively charged particle is attracted to a negatively charged particle C) One atom gives up electrons to another atom D) Two atoms share electrons E) Two polar molecules are attracted to each other

D

A guess in a scientific process is called __; a unifying explanation for a range of observations is termed___? A) Theory: Hypothesis B) Theory: Experiment C) Hypothesis: Control D) Hypothesis: Theory E) Experiment: Theory

D

A molecule of glucose has the molecular formula C6H12O6. Therefore it has __ atoms. A) 3 B) 12 C) 6 D) 24 E) None of the above

D

After being formed by ribosomes on the endoplasmic reticulum, what is the next organelle to which a protein might be transported? A) Mitochondria B) Smooth endoplasmic reticulum C) Nucleus D) Golgi apparatus E) Chloroplast

D

Prior to protein synthesis, the DNA A) Attracts tRNAs with appropriate amino acids B) Must first undergo replication C) Contains anticodons that must become codons D) Serves as a template for the production of mRNA E) Attaches to ribosomes for protein synthesis

D

The Bacteria and Eukarya domains are distinguished by: A) All members of Bacteria are single-celled and all members of Eukarya are multicellular. B) All Bacteria get nutrients via absorption and all Eukarya by photosynthesis. C) Only Eukarya have the ability to grow and reproduce. D) In Bacteria there is an absence of membranous organelles, such as a nucleus. E) Only Eukarya have DNA

D

The atomic number of carbon is 6. Its nucleus must contain: A) 6 neutrons and 6 protons B) 3 protons and 3 neutrons C) 6 neutrons and 0 electrons D) 6 protons and 0 electrons E) 6 protons and 6 electrons

D

Traits controlled by sex-linked recessive genes are expressed more often in males because: A) Males inherit these genes from their fathers B) Males always carry two copies of these genes C) All male offspring of a female carrier get the gene D) The male has only one copy of these genes E) Males get more copies of recessive genes than females do

D

What is the importance of crossing over in meiosis? A) It provides extra genetic material for the daughter cells B) It produces proteins necessary for cell division C) It causes the separation of homologous chromosomes D) It ensures that the daughter cells have different genetic material E) It initiates meiosis 11

D

Which of the following is NOT one of the four most common elements found in living organisms? A) Hydrogen B) Carbon C) Oxygen D) Sulfur E) Nitrogen

D

Which of the following issues would be LEAST helped by application of the scientific method? A) Developing more effective high school curricula B) Evaluating the relationship between violence in videogames and criminal behavior in teens C) Determining the most effective safety products for automobiles D) Formulating public policy on euthanasia E) Comparing the effectiveness of two potential antibiotics

D

Which of the following reactions requires the removal of water to form a covalent bond? A) Glycogen -> glucose subunits B) Peptide -> amino acids C) Cellulose -> glucose D) Glucose and galactose -> lactose E) Fat -> fatty acids and glycerol

D

Which of the following will be least likely to degrade a protein? A) Temperature greater than 100 degrees centigrade B) Strong acid C) Strong base D) Water E) Poisons

D

Which represents the correct sequence of stages in the cell cycle? A) G1, G2, S, M B) G1, G2, M, S C) M, S, G1, G2 D) G1, S, G2, M E) G1, M, G2, S

D

Which the following occurs in the nucleus in a eukaryotic cell? A) Transcription only B) Assembly of amino acids into protein only C) Replication of genetic material only D) Both transcription and replication of genetic material E) Translation only

D

A "mini-gene" has the base sequence TACCCGTGCACG. If the T at the beginning of the sequence is deleted, what will be the consequence? A) All of the codons after that point will be changed B) Only the amino acid coded for in that codon will be changed C) RNA polymerase will skip that codon, but all the others will be read normally. D) RNA polymerase will correct the deletion, and a normal protein will be produced E) The first nucleotide is always replaced anyway, so there will be no change.

A

A human male has ___ chromosomes with ___ sex chromosomes. A) 46, XY B) 48, XY C) 46, XX D) 48, XX E) 48, YY

A

An individual with a dominant phenotype is crossed with an individual with a recessive phenotype and 4 of their 9 offspring show the recessive phenotype. What is the genotype of the parent with the dominant phenotype? A) Aa B) AA C) aa D) AAAa E) Aaaa

A

During the Krebs cycle: A) The products of glycolysis are further broken down, generating additional ATP and NADH molecules B) High-energy electron carriers pass their energy to molecules of sugar, which store them as potential energy C) Cellular respiration can continue even in the absence of oxygen D) Pyruvate molecules are converted to lactate E) NADH gets oxidized to NAD+

A

During which stage of meiosis does crossing-over occur? A) Prophase 1 B) Metaphase 1 C) Anaphase 11 D) Prophase 11 E) Metaphase 11

A

Fish sperm consists mostly of the male fish's DNA. If tested chemically, there would be relatively high amounts of A) Nitrogenous bases, sugar and phosphate groups B) Phospholipids and steroids C) Triglycerides and ATP D) Proteins and stored fats E) Amino acids and unsaturated fats

A

For the DNA sequence G-C-C-T-A-T in one polynucleotide chain, the sequence found in the other polynucleotide chain must be: A) C-G-G-A-T-A. B) G-C-C-A-T-A. C) C-G-G-A-U-A. D) A-T-T-C-G-C. E) G-C-C-T-A-T.

A

Genetic variations in natural populations develop due to: A) Random mutations of the DNA B) Changes in the diet C) Changes in the environment D) Environmental catastrophes E) Individual activities

A

How are amino acids and proteins related? A) Proteins are made up of chains of amino acids B) Amino acids are formed by joining together many proteins C) Proteins are a portion of an amino acid D) Proteins are chains of carbohydrates; amino acids are a type of lipid E) Amino acids are similar to fatty acids

A

In controlled experiments: A) One variable is manipulated while others are held constant B) All variables are dependent on each other C) All variables are held constant D) All variables are independent of each other E) All critical variables are manipulated

A

Natural selection can act on a trait only if the trait is: A) Heritable B) Behavioral C) Favorable D) New E) Morphological

A

The "first cells" shown at the bottom of this illustration most likely refer to: A) Prokaryotes. B) Animals. C) Plants. D) Fungi. E) Protists.

A

The atoms of a single element A) Have the same number of electrons B) Can form bonds only with atoms of the same element C) Can have different numbers of electrons D) Can have different numbers of protons E) Always have an overall positive charge

A

The cell formed through fertilization is called a/an A) Zygote B) Gamete C) Sperm cell D) Ovum E) Egg cell

A

The formation of ions involves the: A) Gain or loss of electrons B) Gain or loss of protons C) Sharing of electrons D) Sharing of protons E) Gain or loss of neutrons

A

The haploid number of chromosomes for humans is * A) 23 B) 24 C) 26 D) 46 E) 48

A

The movement of water across a membrane from a solution of lower solute concentration to a solution of higher solute concentration is best described as A) Osmosis B) Facilitated diffusion C) Active Transport D) Simple diffusion E) Endocytosis

A

The process of converting the "message" of mRNA into a sequence of amino acids is called: A) Translation B) Transcription C) Replication D) Activation E) Duplication

A

What determines the cohesiveness of water molecules? A) Hydrogen bonds B) Ionic bonds C) Covalent bonds D) Hydrophobic interactions E) High heat of vaporization

A

What happens when hydrochloric acid is added to water? A) The HCl molecules separate into H+ and Cl- B) The water had less free H+ C) The concentration of OH- increases D) The pH of the water increases E) None of the above

A

Which mutation provides a survival advantage? A) A flower that attracts more bees B) A tree that grows shorter than the surrounding trees C) A horse that lacks the ability to digest either grains or grass D) A brightly colored fish that attracts predators E) A shrub that loses the ability to make seeds

A

Which of the following are both universal characteristics of life? A) The ability to grow and the ability to reproduce using DNA B) The ability to reproduce using DNA and the ability to capture energy from the sun C) The ability to move and the ability to sense the environment D) The ability to grow and the ability to think E) The ability to reproduce and the ability to sleep

A

Which of the following does NOT describe a chemical reaction? A) The products are placed to the left of the arrow B) The reactants are placed to the left of the arrow C) The arrow represents the direction in which the reaction proceeds D) Atoms must be balanced on both sides of the equation E) All of the above are true

A

Which of the following energy-generating processes is the only one that occurs in almost all living organisms? A) Glycolysis B) Combustion C) Krebs Cycle D) Photosynthesis E) Chemiosmosis

A

Which of the following refers to the amino acid sequence of proteins? A) Primary B) Secondary C) Tertiary D) Quaternary E) None of the above

A

Which of these processes occurs in the cytosol? A) Glycolysis B) Electron Transport System C) Krebs Cycle D) Photosynthesis E) Chemiosmosis

A

Which type of cell does NOT produce cell walls? A) Animal cells B) Plant cells C) Archaea D) Bacteria E) Prokaryotic cells

A

A basic difference between a prokaryotic cell and a eukaryotic cell is that the prokaryotic cell: A) Possesses membrane-bound organelles. B) Lacks a nucleus. C) Lacks DNA D) is considerably larger. E) is structurally more complex.

B

A chemical compound that releases OH- into a solution is called: A) A proton B) A base C) An acid D) A hydroxide ion E) A hydrogen ion

B

As shown in this figure, the top triglyceride (a) has ____; the bottom triglyceride has ____. A) Double bonds and is saturated; no double bonds and is unsaturated B) No double bonds and is saturated; double bonds and is unsaturated C) No double bonds and is unsaturated; double bonds and is saturated D) Double bonds and is unsaturated; double bonds and is unsaturated E) Double bonds and is unsaturated; no double bonds and is saturated

B

From your knowledge of the function of lysosomes, the pH of lysosomes is likely to be A) Always changing B) 5 C) Neutral D) 9 E) 12

B

If a reaction results in one molecule losing an electron and a second molecule gaining that electron, the electron donor is said to be A) Reduced B) Oxidized C) Transformed D) Activated E) Inhibited

B

In plant cells, chloroplasts A) Serve the same purpose as mitochondria do in animal cells B) Are the site of conversion of light energy into chemical energy C) Play an important role in the breakdown of plant toxins D) Generate turgor pressure E) A and B are correct

B

Mitochondria and chloroplasts share all of the following characteristics EXCEPT that they: A) Are capable of ATP synthesis. B) Capture the energy of sunlight to meet metabolic demands. C) Possess their own DNA D) Are surrounded by a double membrane E) Were originally independent organisms

B

The movement of molecules across a membrane from an area of higher concentration (of the molecule)to an area of lower concentration is best described as A) Osmosis B) Passive transport C) Active transport D) Electron transport E) Receptor-mediated endocytosis

B

To test the effect of vitamin D on growth, two groups of rats were raised under identical conditions and fed the same diet. One of the groups received daily injections of vitamin D. The other group received injections of saline, which did not contain vitamin D. All the rats were weighed weekly for 2 months. In this experiment, the control was the: A) Group receiving vitamin D. B) Group receiving saline. C) Average weight gain of the rats. D) 2-month period of time. E) The diet the rats ate

B

What are alleles? A) Genes for different traits, such as hair color or eye color B) Alternative forms of a gene for a single trait, such as blue eyes or brown eyes C) The location of genes on the chromosome D) Recessive forms of the gene E) Dominant forms of the gene

B

What do we call the maintenance of internal conditions of an organism within a certain boundary range? A) Evolution B) Homeostasis C) Adaptation D) Metabolism E) Photosynthesis

B

What type of chemical reaction results in the breakdown of organic polymersinto their respective subunits? A) Condensation B) Hydrolysis C) Oxidation D) Ionization E) Dehydration

B

Which is not a feature of a prokaryotic cell? A) A plasma membrane B) A nuclear membrane C) Ribosomes D) Enzymes E) DNA

B

Which of the classes of RNA molecules carries the amino acids that are added to the growing polypeptide chain? A) Ribosomal RNA B) Transfer RNA C) Messenger RNA D) Primary RNA E) Secondary RNA

B

Which of the following can evolve? A) Individuals B) Populations C) Genes D) DNA E) All of the above

B

Which of the following is NOT true according to Mendel's law of segregation? A) Each individual contains two factors for each trait B) One factor must be dominant and one must be recessive C) Factors separate from each other during the formation of gametes D) Each gamete contains one copy of each factor E) Fertilization restores the two copies of each factor

B

Which of the following statements about DNA replication is NOT correct? A) The DNA molecule unwinds as the hydrogen bonds are broken B) Replication occurs as each base is paired with one exactly like it C) The process is known as semiconservative replication because one old strand is conserved in the new molecule D) The enzyme that replicates the DNA is DNA polymerase E) The enzyme that links the Okazaki fragments together is DNA ligase

B

Which of the following statements about prokaryotes is incorrect? A) Prokaryotes appeared on earth before eukaryotes B) Prokaryotes have circular pieces of DNA within their nuclei C) Prokaryotes contain cytoplasm D) Prokaryotes contain ribosomes E) Some prokaryotes con photosynthesize

B

Which point mutation would be most likely to have a catastrophic effect? A) A base substitution B) A base deletion near the start of the coding sequence C) The deletion of three bases near the start of the coding sequence D) A base deletion near the end of the coding sequence E) A base deletion at the very end of the coding sequence

B

Which sequence of stages in mitosis is correct? A) Prophase, anaphase, metaphase, telophase B) Prophase, metaphase, anaphase, telophase C) Anaphase, metaphase, telophase, prophase D) Anaphase, prophase, telophase, metaphase E) Prophase, telophase, anaphase, metaphase

B

A chemical compound that releases H+ into a solution is called: A) A proton B) A base C) an acid D) A hydroxide ion E) A hydrogen ion

C

A neutral solution has A) No H+ B) No OH- C) equal amounts of H+ and OH- D) No pH E) A pH of 0

C

A primary source of scientific results is ___ A) The news media B) Anecdotes from others C) Articles in peer- reviewed journals D) The internet E) All of the above

C

An antibiotic is given repeatedly to treat a recurrent ear infection. It worked initially but now is no longer effective. This likely indicates that the Streptococcus bacterium: A) Is very sensitive to the antibiotic. B) Is being treated with an antibiotic that has experienced a manufacturing error, making it ineffective. C) Experienced natural selection that has allowed the resistant Streptococcus bacteria to survive and multiply. D) Are infectious only if they are sensitive to the antibiotic. E) All of the above

C

An individual who is a carrier for a sex-linked trait, such as hemophilia: A) Is always male B) Is homozygous for the condition C) Shows the dominant phenotype D) Cannot pass the gene to his or her daughters E) Is never a female

C

At the end of glycolysis, the original carbons of the glucose molecule form: A) Six molecules of carbon dioxide B) Two molecules of NADH C) Two molecules of pyruvate D) Two molecules of citric acid E) Two molecules of fructose

C

Evolution: A) Occurs too slowly to be observed B) Can occur in the wild but not in the laboratory C) Is responsibility for the increased occurrence of antibiotic-resistant bacteria D) Is unrelated to mutations in DNA E) All of the above are correct

C

For a mutation to affect the evolution of an animal species, it must occur in A) Somatic cells B) Prokaryotic cells C) Gametes D) None of the above E) All of the above

C

If a DNA sample contains 13% adenine, what percentage of the sample contains cytosine? A) 13% B) 0% C) 37% D) 26% E) 74%

C

If a sperm cell has 6 chromosomes, it comes from an animal whose somatic cells have ___ chromosomes. A) 6 B) 10 C) 12 D) 18 E) 24

C

If enzymes were used during a reaction, which of the following could be added to a system to make the reaction occur faster? A) Water B) A decrease in temperature C) An small increase in heat energy D) End products E) All of the above

C

In an analysis of the nucleotide composition of DNA to see which bases are equivalent in amount, which of the following is true? A) A = C B) A = G and C = T C) A + C = G + T D) A + T = C + G E) G = T

C

In an experiment, you measure the concentration of a polar molecule inside and outside the cell and find that the concentration of this molecule is gradually increasing inside the cell. You also measure the concentration of ATP inside the cell and find that it is dropping. Which of the following processes are you likely to be observing? A) Osmosis B) Facilitated diffusion C) Active Transport D) Simple diffusion E) Passive transport

C

Large biological molecules are synthesized by removal of A) Carbon B) Covalent bonds C) Water D) Oxygen E) Peptides

C

Which of the following is TRUE regarding the genetic information in the cells of your body? A) Different kinds of body cells contain different genetic information. B) Each type of body cell contains only the genetic information it needs to be that type of cell. C) The genetic information in almost all of your body cells is identical. D) The genetic information in your body cells changes in a predictable manner as you grow and develop. E) The genetic information is stored in the sequence of amino acids in proteins

C

Which of the following levels of organization is the most inclusive? A) Organism B) Population C) Biosphere D) Community E) Ecosystem

C

Which of these atoms would become inert if it accepted three electrons? A) Carbon B) Hydrogen C) Phosphorus D) Calcium E) All of the above

C

Which organism is least likely to survive to reproduce? A) A flower that produces a scent that attracts bees B) A shrub that produces a toxin in its flower buds that repels deer C) An animal with a mutation that causes skin color to be more noticeable D) A dark-furred rodent that comes out only at night E) a seahorse that mimics the weeds in which it lives

C

A lipid is a polymer made up of which kind of monomers? A) Glucose or modified glucose molecules B) Amino Acids C) Nucleotides D) Alternating sugar and phosphate groups E) Fatty acids and glycerol

E

At which stage of meiosis is each chromosome composed of a single chromatid? A) Prophase 1 B) Prophase 11 C) Metaphase 1 D) Metaphase 11 E) Anaphase 11

E

If a species contains 40% guanine in its DNA, what is the percentage of adenine that it would contain? A) 40% B) 60% C) 100% D) 20% E) 10%

E

In a phospholipid bilayer, the A) Phosphate groups are hydrophobic B) Fatty acids tails are ionized C) Fatty acid tails are hydrophilic D) Proteins are located only between the two phospholipid bilayers E) Phosphate heads are oriented toward the exterior of the cell or toward the cytoplasm

E

The anaerobic breakdown of glucose is called A) Glycolysis B) Electron Transport System C) Krebs Cycle D) Photosynthesis E) Fermentation

E

The second orbital shell of an atom can hold ___electrons A) 2 B) 3 C) 4 D) 6 E) 8

E

Which is the correct sequence of increasing organization? A) Molecule, cell, organelle, organ B) Organelle, tissue, cell, organ C) Atom, molecule, tissue, cell D) Organ, organism, tissue, cell E) Cell, tissue, organ, organ system

E

Which of the following are expected to result in genetic variation among offspring? A) Mutations B) Crossing over C) Random assortment of parental chromosomes during meiosis D) A and B E) A, B, and C

E

Which of the following is FALSE about scientific theories? A) They have been thoroughly tested. B) They are developed by inductive reasoning. C) They are used to support observations using deductive reasoning. D) They can be either supported or modified by new observations. E) They are firmly established and cannot be refuted.

E

Which of the following is/are characteristics of living organisms? A) Organized structure B) Growth and reproduction C) Maintenance of homeostasis D) A and B E) A, B and C

E

Which property of water molecules enables water to function as a moderator of temperature for living organisms? A) High specific heat B) High heat of vaporization C) High heat of fusion D) A and B E) A, B, and C

E

Which statement is NOT true about x-linked characteristics? A) More males than females are affected B) If a female has the characteristic, all her sons will show it C) Females can be carriers of the gene without showing it D) The characteristic often skips a generation, from a woman's father to her son E) Males can have two copies of the allele for the trait, but females only have one

E