When chromosomes replicate
A) the original DNA is distributed to the two daughter cells, with no new DNA synthesized.
B) the two DNA strands separate and each is used as a template for synthesis of a new strand.
C) one strand of the DNA is completely replicated first, and then the second strand is replicated.
D) new DNA synthesis occurs in only one location along the entire DNA molecule.
B
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All of the following statements about exoskeletons are correct except
A. muscles are attached to the exoskeleton. B. exoskeletons do not limit growth because they can stretch. C. exoskeletons are shed by many arthropods in a process called molting. D. exoskeletons are made of chitin. E. chitin is a polysaccharide.
One problem with using common names is that
a. many organisms may have the same common name. b. many common names may exist for the same organism. c. the common name may vary by language and region. d. all of the above are true.
Provide at least two types of evidence that support the endosymbiont theory. What will be an ideal response?
A potential source of nitrogen in a sandy soil environment might be the bacterium, Rhizobium, which inhabits the root nodules of leguminous plants. Which of these statements is true, and should prevent Rhizobium or other root-inhabiting nitrogen-fixers from contributing nitrogen to the soil in this experiment?
A) Mosses have no roots. B) Moss gametophytes lack stomata. C) Mosses evolved before there were substantial amounts of nitrogen in Earth?s atmosphere. D) Among land plants, only legumes are known to establish symbiotic relationships with members of other kingdoms.