bio PT 1

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

A) 23

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) Aa

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

A) Animal cells

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

A) Heritable

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) 6 protons and 0 electrons

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) Both transcription and replication of genetic material

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) Cell, tissue, organ, organ system

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

E) Only Eukarya have DNA

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) They are firmly established and cannot be refuted.

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) Gain or loss of electrons

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) Glycolysis

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) 37%

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) C-G-G-A-T-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 constantD) All variables are independent of each other E) All critical variables are manipulated

A) One variable is manipulated while others are held constant

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) Osmosis

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) Primary

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) Random mutations of the DNA

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) The HCl molecules separate into H+ and Cl-

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) A base

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

B) A nuclear membrane

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) Alternative forms of a gene for a single trait, such as blue eyes or brown eyes

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) Capture the energy of sunlight to meet metabolic demands.

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) Homeostasis

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

B) Hydrolysis

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) Lacks a nucleus.

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) No double bonds and is saturated; double bonds and is unsaturated

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) One factor must be dominant and one must be recessive

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

B) Populations

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) 12

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) Active Transport

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

C) Electron Transport System

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

C) Experienced natural selection that has allowed the resistant Streptococcus bacteria to survive and multiply.

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) Gametes

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) Messenger RNA

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) Phosphorus

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

C) Protist

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) Shows the dominant phenotype

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) The genetic information in almost all of your body cells is identical.

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) Two molecules of pyruvate

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) Formulating public policy on euthanasia

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) G1, S, G2, M

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) Glucose and galactose -> lactose

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) Golgi apparatus

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) It ensures that the daughter cells have different genetic material

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) Two atoms share electrons

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) Water

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) A, B and C

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) A, B, and C

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) A, B, and C

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) Anaphase 11