Binary fission differs from the division of eukaryotic cells in that

A. tubulin is involved in chromosome segregation in binary fission.
B. cytokinesis occurs only in binary fission.
C. binary fission results in daughter cells with differing genetic makeup.
D. DNA replication does not take place in eukaryotic cells.
E. a spindle is involved in chromosome segregation in eukaryotic cells.

E.
Anaphase

A. involves chromosomes lining up at the equatorial plate.
B. occurs just before cytokinesis.
C. is the phase during which sister chromatids separate and move to opposite poles.
D. occurs before the nuclear envelope breaks down.
E. occurs just after cytokinesis.

C.
DNA replication occurs

A. only before mitosis.
B. before both mitosis and meiosis.
C. during chromosome condensation.
D. during G2.
E. only before meiosis

B.
After DNA replication, each chromosome has _______ molecules of DNA called _______, that after separation are known as _______ chromosomes.

A. two; sister chromatids; daughter
B. four; sister chromosomes; daughter
C. two; daughter chromosomes; sister
D. four; sister chromatids; daughter
E. two; daughter chromatids; sister

A.
Which statement about cyclin-dependent kinases (CDKs) or cyclin is false?

A.CDKs use ATP as a substrate.
B. Cyclin is made continuously during the cell cycle.
C. Different CDKs act at different points in the cell cycle.
D. Phosphorylated retinoblastoma protein is inactive.
E. A CDK can catalyze the phosphorylation of retinoblastoma protein.

B.
Cytokinesis

A. involves actin in both animals and plants.
B. precisely distributes organelles.
C. involves the Golgi apparatus in plants.
D. uses the same motor proteins in animals and plants
E. does not require energy.

C.
Translocations

A. are rare.
B. are the breaking and rejoining of chromatids of homologous chromosomes.
C. are not likely to affect gene expression.
D. cannot be passed to offspring.
E. can occur in mitotic cells.

E.
Which statement about aneuploidy is false?

A. It occurs in humans.
B. Aneuploidy results when a piece of one chromosome translocates to another chromosome.
C. Trisomies are common in human zygotes.
D. It results from chromosomal nondisjunction.
E. An individual with an extra chromosome is trisomic.

B.
In an experiment on the regulation of the cell cycle, it was found that S phase cells produce a substance that, when diffused in G1 nuclei, activated DNA replication. Radioactive labeling was then used to determine which nuclei were synthesizing DNA. The results are shown in the table below. Based on this data, which radioisotope was most likely used, and in what form? Hint: Think about the structure of the molecule where synthesis is being monitored. (Table was on quiz)
A. 35S; 35S-cysteine
B. 32P; 32P-phospholipid
C. 35S; 35S-sulfate
D. 14C; 14C-carbon dioxide
E. 32P; 32P-phosphate
E.
In meiosis, as opposed to mitosis,

A. genetically identical daughter cells are produced.
B. pairing of homologous chromosomes occurs.
C. crossing over cannot take place.
D. there is no cytokinesis.
E. only two daughter cells are formed.

B.
Apoptosis

A. occurs only in animals.
B. is the same process as necrosis.
C. is triggered solely by signals external to the cell.
D. occurs only during development.
E. is controlled by signal transduction pathways.

E.
Which stage of mitosis includes the formation of kinetochores?

A. Anaphase
B. Interphase
C. Telophase
D. Metaphase
E. Prophase

E.
Which statement about asexual reproduction in flowering plants is true?

A. In asexual reproduction, two gametes fuse to produce a zygote.
B. n asexual reproduction, there is genetic variation among the offspring.
C. Asexual reproduction requires meiosis.
D. Asexual reproduction produces offspring that are genetically identical to the parent.
E. In asexual reproduction, progeny have half the number of chromosomes as the parent.

D.
Homologous chromosomes undergo crossing over during _______ of meiosis.

A.prophase I of meiosis.
B. prophase II of meiosis.
C. prophase I of mitosis.
D. prophase I and II of meiosis.
E. anaphase II of meiosis.

A.
The mitotic spindle

A. is composed of two different types of microtubules.
B. provides the force needed for chromosome movement.
C. plays a role in cytokinesis.
D. begins to form during metaphase.
E. is composed of intermediate filaments.

B.
A human cell in G1 of the cell cycle has 23 pairs of chromosomes. The number of daughter chromosomes in a cell in telophase II of meiosis is

A.34.
B.92.
C. 46.
D. 69.
E. 23.

E.
In sexually reproducing organisms, the diploid phase of the life cycle begins at

A. gamete formation.
B. mitosis.
C. spore formation.
D. meiosis.
E. fertilization.

E.
Which cellular event occurs outside of interphase?

A. The synthesis of cellular components necessary for mitosis
B. G1
C. The condensation of chromatin
D. DNA replication
E. G2

C.
In meiosis II,

A. DNA replication occurs.
B. chromosomes do not condense.
C. crossing over occurs.
D. sister chromatids are separated.
E. four genetically identical cells are generated.

D.
The DNA content of a cell can be measured using a fluorescent dye. Based on the table below, at what point in the cell cycle does the DNA content begin to double?
Cell cycle Phase Dye Intensity
G 0 52
G1 49
G2 103
M 100
S 102

A. G1 phase
B. G0 phase
C. G2 phase
D. S phase
E. M phase

D.
x

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