Bio Placement Test

During which phase of the eukaryotic cell cycle does DNA and chromosome replication occur? A) the S phase of interphase B) the G1 phase of interphase C) the mitotic phase D) cytokinesis E) the G2 phase of interphase

A) the S phase of interphase

The cell formed through fertilization is called a/an A) zygote B) gamete C) sperm cell D) ovum E) egg cell

A) zygote

Which of these processes occurs in the cytosol? A) glycolysis B) electron transport system C) Krebs cycle D) photosynthesis E) chemiosmosis

A) glycolysis

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) have the same number of electrons

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) prophase 1

What determines the cohesiveness of water molecules? A) Hydrogen bonds B) ionic bonds C) covalent D) hydrophobic interactions E) high heat of of vaporization

A) Hydrogen bonds

The anaerobic breakdown of glucose is called A) glycolysis B) electron transport system C) Krebs cycle D) photosynthesis E) fermentation

A) glycolysis

Choose the correct pathway of information flow in the cell. A) RNA--> DNA--> protein B) DNA--> RNA--> protein C) ER--> DNA--> RNA--> protein D) ER--> DNA--> Golgi--> protein E) ribosomal RNA--> DNA--> protein

B) DNA--> RNA--> protein

What best describes a control group in an experiment? A) the condition that is being tested B) a sample taken through all experimental steps except the one being tested C) a variable that changes throughout the experiment D) the dependent variable E) a condition that is different in every way from what is being tested

B) a sample taken through all experimental steps except the one being tested

Which molecule attaches to pyruvate after glycolysis and before Krebs cycle? A) lactate B) acetyl-CoA C) citric acid D) NADH E) oxygen

B) acetyl-CoA

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) are the site of conversion of light energy into chemical energy

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 know as semiconservative replication because one old strand is conserved in the new molecules D) the enzyme that replicates the DNA is DNA polymerase E) the enzyme that links the Okazaki fragments together is DNA ligase

B) replication occurs as each base is paired with one exactly like it

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) NAD+ is regenerated for use in glycolysis

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) NAD+ is regenerated for use in glycolysis

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

Which of the classes of RNA molecules is part of the process of transcription? A) ribosomal RNA B) transfer RNA C) messenger RNA D) primary RNA E) secondary RNA

C) messenger RNA

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

The human appendix is an example of a(n): A) analogous structure B) homologous structure C) vestigial structure D) adaptation E) mutation

C) vestigial structure

What is the importance of crossing over during meiosis? A) it provides extra genetic material for the daughter cells B) it provides 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

Triglycerides are: A) polymers of amino acids B) always composed of carbon rings C) lacking carboxyl groups (COOH) D) nonpolar and hydrophobic E) made from glycerol and nucleic acids

D) nonpolar and hydrophobic

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

E) 8

Which of the classes of RNA molecules is/are a part of the process of translation? A) ribosomal RNA B) transfer RNA C) messenger RNA D) A and C E) A, B and C

E) A, B and C

Which of the following molecules can be modified to enter the citric acid/Krebs cycle? A) pyruvate B) amino acids C) fatty acids D) none of the above E) all of the above

E) all of the above