Which of the following was a significant new challenge plants faced in moving to land that they had not faced in their aquatic environment?
a. predation
b. desiccation
c. the need for osmotic regulation
d. light availability
e. nutrient availability
Ans: b. desiccation
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Conjugating ciliates exchange a pair of haploid micronuclei that undergo mitosis as a diploid micronucleus, while the macronucleus in each
A. is expelled from the cell. B. disintegrates. C. divides by meiosis. D. fuses with each other. E. shrinks and becomes diploid micronuclei.
Meselson and Stahl determined that DNA replication in E. coli is semiconservative. What additive did they initially supply to the medium in order to distinguish "new" from "old" DNA?
What will be an ideal response?
Which behavior is an example of a fixed action pattern?
A) the imprinting of baby goslings on their mother B) habituation in the cnidarian Hydra C) the way female digger wasps find their nests D) the way a greylag goose retrieves an egg that has rolled out of the nest
Cells that ingest and destroy bacteria and other foreign particles are called:
a. phagocytes. b. lymphocytes. c. goblet cells. d. ciliated cells.