The first plants evolved rapidly during the __________ period
a. Devonian
b. Silurian
c. Carboniferous
d. Triassic
e. Ordovician
B
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Deoxyribonucleic acid
a. is one of the adenosine phosphates. b. is one of the nucleotide coenzymes. c. stores and retrieves heritable information in all cells. d. translates protein-building instructions into actual protein structure. e. is none of these.
Which of the following is NOT true of hydrogen bonds?
a. They are quite weak. b. The hydrogen is slightly positive. c. They are uncommon in macromolecules. d. They form in salts such as NaCl. e. They always involve hydrogen.
Traits like reduced body hair in many native North American and Asian populations are most likely the result of sexual selection
Indicate whether the statement is true or false
Which of the following ethnic groups does NOT have Neanderthal DNA in their genome?
A. Western Europeans B. Australians C. Tibetans D. Africans