Cells actively secreting enzymes would likely carry out more ____ than other cells
a. exocytosis
b. osmosis
c. endocytosis
d. conjugation
e. fractionation
ANSWER: a
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A gene is a DNA sequence that codes for a
protein or
a. RNA. b. DNA. c. ribosomes. d. a lipid. e. more than one of these.
Four of the following statements are true of the organism depicted in the figure above. Which one is the exception?
a. It represents a symbiotic relationship. b. It contains two different organisms. c. It decreases the absorptive surface of the partner. d. It can live in harsh climates. e. It can break down the bedrock it colonizes.
A morula becomes a _________ when it reaches the uterus
a. gastrula. b. blastomere. c. blastocyst. d. gamete. e. zygote.
The root-shoot axis of plants
A. is determined by sunlight, as roots grow away from the sun and shoot grow toward the sun. B. is determined by three axes. C. is determined by the orientation of the first zygotic cell division. D. develops in segments. E. None of the answers are correct.