Jellyfish (cnidarians) and comb jellies are thought to be closely related. While both trap food, the mechanism by which they achieve prey capture is different. Which of the following statements reflects this difference?
A. Comb jellies use cilia to create small
currents around their bodies to draw in prey;
jellyfish catch prey opportunistically.
B. Comb jellies use specialized cells derived
from mesoderm-like tissues to chase prey;
jellyfish catch prey opportunistically.
C. Comb jellies have a sticky substance on
their tentacles to trap prey; jellyfish have
nematocysts to sting and immobilize prey.
D. Comb jellies have a stomach to digest and
absorb prey; jellyfish have a stomach and a
rudimentary intestine to digest and absorb
prey.
C
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Which of the following is a method of introducing genes into plants?
a. using Ti plasmid and Rhizobium radiobacter bacteria to infect cells with the new genes b. creating transgenic plant cells in cultures to produce a callus which then grows into a transgenic plant c. crossing plants with desirable traits with other plants with the same trait for multiple generations d. both using Ti plasmid and Rhizobium radiobacter bacteria to infect cells AND creating transgenic plant cells to produce a callus that grows into a transgenic plant. e. both using Ti plasmid and Rhizobium radiobacter bacteria to infect cells AND crossing plants with desirable traits with other plants with the same trait for multiple generations.
Researchers can deliver genes into plants by using
a. the bacterium Agrobacterium tumefaciens. b. microscopic particles coated with DNA. c. electric shocks. d. chemicals. e. all of these.
Which of the following does NOT apply to parasitoids?
A. They are insects. B. They kill animals on which they feed. C. Their host usually survives. D. The larvae develop in a host’s body. E. Some are effective biological control agents.
A survivorship curve that shows a population producing very few offspring, each of which has a high probability of surviving to adulthood, is typical of
A) sea stars. B) elephants. C) oysters. D) rodents.