What is a characteristic of eukaryotes?
a. All are multicelled organisms
b. Their cells are typically smaller than bacteria.
c. They are more like bacteria than archaea.
d. Their cells are less complex than bacteria or archaea.
e. Their DNA is contained in a nucleus.
ANSWER: a
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In the example of the flicker hybrid zone, why does it appear that the flicker hybrids are in a stable hybrid zone?
a. The two kinds of flickers are reproductively isolated from one another. b. The two kinds of flickers have evolved completely into one distinct group. c. The two kinds of flickers have shown some reinforcement and thus the hybrids are beginning to disappear. d. The two kinds of flickers have out-competed their parental populations and exist as an entirely new species. e. The two kinds of flickers do not show reinforcement, nor have fused into one distinct group and their hybrid zone has not expanded.
Establishing a phylogeny for bacteria is more difficult than establishing a phylogeny for plants or animals." This statement is:
A. correct because it is difficult to obtain enough morphological data from bacteria. B. correct because bacteria can engage in lateral gene transfer. C. incorrect because bacteria are so small. D. correct because of the quick generation time of bacteria.
Which of the following is (are) proposed to be a function of telomeres?
a) They are required for the complete replication of the chromosome. b) They prevent the ends of chromosomes from fusing with one another. c) They form caps that protect the chromosomes from nucleases and other destabilizing influences. d) All of the choices are correct.
In humans, transmission of nerve impulses across a synaptic cleft is carried out by ________.
a. neurotransmitter molecules b. potassium ions c. the nodes of Ranvier d. sodium ions