The sperm head encloses a compact nucleus and is capped by a vesicle called what?
A. Sertoli cell
B. flagellum
C. acrosome
D. vas deferens
E. epididymis
C. acrosome
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The information in DNA is copied into molecules of ____
a. lipid b. carbohydrates c. hydrogen peroxide d. oxygen e. RNA
Calico cats are female. The patches of fur color result from X inactivation, silencing fur color genes on one X chromosome or the other. However, extremely rarely, there can be a male calico. Describe the genetics necessary for a male calico cat.
A. XX with a translocation of the SRY gene onto one of the X chromosomes. B. XY with a mutation in the SRY gene. C. XX with a translocation of the testosterone gene onto one of the X chromosomes. D. XY with a mutation in the estrogen gene. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about calico cats? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Egg-laying mammals ____.
A. hatch fully developed young from their eggs B. are monotremes C. are hairless D. are confined to South America E. bear their young into permanent pouches
Which is the metabolic breakdown of substances?
a. catabolism b. anabolism c. using ATP d. photosynthesis e. formation of ATP