An XYY male has _______ that resulted from nondisjunction during spermatogenesis.
a. Jacobs syndrome
b. Down syndrome
c. Klinefelter syndrome
d. Turner syndrome
Answer: a. Jacobs syndrome
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Which is not true of DNA replication?
a. It occurs in the S phase of the cell cycle. b. It functions similarly for all organisms. c. It is semiconservative. d. Both strands are synthesized in one direction only. e. Both strands are synthesized continuously.
Which of the following statement is true about helicase?
A. Helicase adds nucleotides to DNA B. Helicase unzips DNA C. All of the above D. Helicase transcribes RNA
Analogous features are problematic when constructing evolutionary tree because they are
a) based on DNA instead of comparative anatomy b) based on comparative anatomy instead of embryology c) monophyletic instead of convergent d) the result of common ancestry instead of natural selection e) the result of natural selection instead of common ancestry
Which human extraembryonic membrane forms the blood vessels of the umbilical cord?
A. Amnion B. Yolk sac C. Chorion D. Allantois E. Protein coat