Before the genes of a zygote become active, the stages of animal development are directed by
a. the environment.
b. the cytoplasmic determinants of the egg.
c. the cytoplasmic determinants of the sperm.
d. the cytoplasmic determinants of the egg and the sperm.
e. the nucleus.
B
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The substances that donate electrons to the electron transport chains of chemolithotrophs are ________.
A. lipids B. carbohydrates C. inorganic compounds D. methane gas and alcohols
Which of the following are NOT components
of the appendicular skeleton? a. arm bones b. collarbones c. finger bones d. ribs e. leg bones
ATP
a. can be produced by endocytosis. b. is the by-product of the biosynthesis of organic compounds such as glucose. c. is produced in greatest amounts during anaerobic respiration. d. is released in aerobic respiration. e. is released in anaerobic respiration.
It is estimated that humans have approximately ________ base pairs in our genome.
A. 180 million B. 2.5 million C. 3 billion D. 12 trillion