Which of the following is NOT characteristic of most parasites:
a. they are specialist and usually are able to affect only one variety of hosts.
b. they inflict serious injury and kill their hosts.
c. some reside inside their hosts, whereas others live outside their hosts.
d. their host may be a plant as well as an animal
e. parasites are smaller than their hosts
Answer: b. they inflict serious injury and kill their hosts.
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What makes water a good solvent?
a. It dissolves ions and polar molecules. b. It dissolves fats. c. It mixes well with alcohol. d. It heats up very quickly. e. It is very acidic.
The diploid portion of a plant life cycle is known as the:a
parental generation. b. sporophyte generation. c. daughter generation. d. gametophyte generation. e. reproductive generation.
The disease, sickle-cell anemia is common in malaria-infested areas because individuals that are heterozygous for the gene (AS) have enhanced resistance to malaria over normal individuals (AA). Individuals with severe sickle-cell anemia (SS) usually die before reproduction. If this population moves to an area without malaria, what will happen to the allele frequency of the A allele over time?
A. It will go up because there is no sickle cell anemia. B. It will go up because there is no malaria. C. It will go down because there is no malaria. D. It will go down because there is no sickle cell anemia.
Classification.Respond to the following statements in reference to the five animal phyla listed below.
A. This phylum has no tissues or organs. B. C. Members of this group have a brain with nerve cords, have a saclike or branched gut, and lack a circulatory system. D. Tapeworms are members of this phylum. E. Members of this phylum have a pseudocoelomic cavity. F. Members of this phylum have a brain with a ventral nerve cord, a complete gut, and a circulatory system that is usually closed.