In humans, the genes for blood type A and B show lack of dominance to one another and both dominate O. Two type O people would be able to have 

A. 1 O: 1 A: 1 B: 1 AB type children.
B. only O type children.
C. 1 O: 1 A type children.
D. only AB type children.


B. only O type children.

Biology & Microbiology

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In various experiments that recreated conditions on the early Earth, molecules such as amino acids,

glucose and ribose were produced from a. clay. b. ether. c. formaldehyde. d. alcohols. e. ATP.

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Which number identifies the site where activators bind?

a. 2 b. 3 c. 4 d. 5 e. 6

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Which group of vertebrates possessed an anatomical feature that made evolution of the limbs of all tetrapods possible?

A) reptiles B) amphibians C) lobe-finned fish D) sharks

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Which of the following is correct about

melatonin?

a. it protects against certain cancers b. it encourages the growth of certain cancers c. it causes a decline in body temperature d. all of these (a through c) are correct about melatonin e. one of these (a through c) is incorrect about melatonin

Biology & Microbiology