What macromolecule is composed entirely of beta-glucose units?
a. starch
b. chitin
c. glycogen
d. cellulose
e. protein
D
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Bat wings, human forearms, elephant legs, and cat forelimbs are collectively referred to as _____
a. analogous structures b. homologous structures c. vestigial structures d. homozygous structures e. heterozygous structures
A human embryo is capable of movement and has gonads that are distinguishable as either testes or ovaries by the end
of the:a. second week. b. fourth week. c. sixth week. d. eighth week. e. first trimester.
Which of the following is either consumed or synthesized in virtually every cellular reaction?
a. sugars b. enzymes c. DNA d. ATP
A bacterial genome is typically
A) a single linear piece of DNA. B) multiple linear pieces of DNA. C) a linear RNA molecule. D) a single circular DNA molecule. E) multiple circular DNA molecules.