Telomerase activity in stem cells is very low
A. true
B. false
B
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Which of the following is a correct comparison of bacterial and eukaryotic chromosomes?
A. Both have a single replication origin. B. Only eukaryotes have specific sequences necessary for DNA distribution during cell division. C. Eukaryotes usually have circular chromosomes; bacteria have linear. D. Both have multiple replication origins. E. Bacteria have circular chromosomes; eukaryotes have linear.
The cellular effect of the abnormally oligomerized yeast protein Sup35 is
a. failure of translation to terminate. b. abnormal chromosome inactivation by heterochromatin formation. c. abnormal imprinting of some genes. d. abnormal cytoskeletal structures. e. failure of chromosomes to condense during mitosis.
A fertility doctor is trying to determine why a couple is infertile. It has been determined that the woman is fertile, so the problem may be with the man. In analyzing his semen, the doctor notices adequate sperm production, but the sperm are largely
inactive. He concludes that the semen may be lacking in proper nutrients for the sperm. Which structure would be the most likely candidate for the source of the problem? A) vas deferens B) seminiferous tubules C) seminal vesicles D) urethra
Humans have ________ pairs of homologous chromosomes.
a. 46 b. 23 c. 22 d. 44