Translocations
A. are rare.
B. are the breaking and rejoining of chromatids of homologous chromosomes.
C. are not likely to affect gene expression.
D. can occur in mitotic cells.
E. cannot be passed to offspring.
D. can occur in mitotic cells.
Homologous chromosomes undergo crossing over during
A. prophase I of meiosis.
B. prophase II of meiosis.
C. prophase I and II of meiosis.
D. prophase I of mitosis.
E. anaphase II of meiosis.
A. prophase I of meiosis.
DNA replication occurs
A. during G2.
B. before both mitosis and meiosis.
C. during chromosome condensation.
D. only before meiosis.
E. only before mitosis.
B. before both mitosis and meiosis.
After DNA replication, each chromosome has _______ molecule(s) of DNA called _______, that after separation are known as _______ chromosomes.
A. two; daughter chromatids; sister
B. four; sister chromosomes; daughter
C. four; sister chromatids; daughter
D. two; daughter chromosomes; sister
E. two; sister chromatids; daughter
E. two; sister chromatids; daughter
Which of the following statements about cyclin-dependent kinases (Cdk’s) or cyclin is false?
A. Different Cdk’s act at different points in the cell cycle.
B. Cdk’s use ATP as a substrate.
C. Phosphorylated retinoblastoma protein is inactive.
D. A Cdk can catalyze the phosphorylation of retinoblastoma protein.
E. Cyclin is made continuously during the cell cycle.
E. Cyclin is made continuously during the cell cycle.
Which of the following statements about aneuploidy is false?
A. An individual with an extra chromosome is trisomic.
B. Trisomies are common in human zygotes.
C. It does not occur in humans.
D. Aneuploidy results when a piece of one chromosome translocates to another chromosome.
E. It results from chromosomal nondisjunction.
C. It does not occur in humans.
In meiosis II,
A. four genetically identical cells are generated.
B. crossing over occurs.
C. DNA replication occurs.
D. sister chromatids are separated.
E. chromosomes do not condense.
D. sister chromatids are separated.
Apoptosis
A. occurs only during development.
B. is the same process as necrosis.
C. occurs only in animals.
D. is controlled by signal transduction pathways.
E. is triggered solely by signals external to the cell.
D. is controlled by signal transduction pathways
A human cell in G1 of the cell cycle has 46 (23 pairs) of chromosomes. The number of daughter chromosomes in telophase II of meiosis is
A. 34.5.
B. 46.
C. 69.
D. 92.
E. 23.
D. 92.
In meiosis, as opposed to mitosis,
A. crossing over cannot take place.
B. there is no cytokinesis.
C. pairing of homologous chromosomes occurs.
D. only two daughter cells are formed.
E. genetically identical daughter cells are produced
C. pairing of homologous chromosomes occurs.
Which of the following statements about asexual reproduction in flowering plants is true?
A. In asexual reproduction, there is genetic variation among the offspring.
B. It produces offspring that are genetically identical to the parent.
C. It requires meiosis.
D. In asexual reproduction, two gametes fuse to produce a zygote.
E. In asexual reproduction, progeny have half the number of chromosomes as the parent.
B. It produces offspring that are genetically identical to the parent.
In sexually reproducing organisms, the diploid phase of the life cycle begins at
A. spore formation.
B. mitosis.
C. meiosis.
D. gamete formation.
E. fertilization.
E. fertilization.
Interphase involves all of the following except
A. the synthesis of cellular components necessary for mitosis.
B. DNA replication.
C. G1
D. the condensation of chromatin.
E. G2
D. the condensation of chromatin.
Human papilloma virus (HPV) infection of the tissues lining the cervix
A. codes for a protein that inactivates the retinoblastoma protein.
B. activates a tumor suppressor.
C. has a gene that codes for a growth factor receptor.
D. results in inhibition of cell division.
E. activates an oncogene.
A. codes for a protein that inactivates the retinoblastoma protein.
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