A layer of membrane attached to a virus is called
A. an envelope.
B. a protein coat.
C. a chromosome.
D. a plasmid.
E. a nucleus.
A. an envelope.
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Starch is used to store energy and cellulose is a structural polysaccharide. The key differences that explain these functions are:
A. cellulose with high branching aids strong structures, and starch with low branching makes for easy energy release. B. the unbranched structure of starch makes it easy to process for energy, and the branched structure in cellulose creates strong bonds. C. alpha 1-4 and alpha 1-6 glycosidic linkage in starch creates branching, and beta 1-4 in cellulose creates unbranched structures. D. beta 1-4 and alpha 1-6 glycosidic linkage of starch can create branches, and alpha 1-4 linkages in cellulose creates cellulose.
Found mostly in marine environments, members of the ____ Lophotrochozoan phylum have a muscular, mucuscovered
proboscis that they can turn inside out to capture prey.
a. Rotifera b. Mollusca c. Platyhelminthes d. Annelida e. Nemertea
Escherichia coli and Clostridium acetobutylicum are reported to be derived from a common ancestor. They have some similar, but not identical gene sequences. What is the best explanation for this difference in genetic coding?
A. After the two species diverged, the similar gene sequences evolved through convergent evolution. B. The two species never diverged, but were discovered by two different scientists and given different names. C. After the two species diverged, the genes accumulated random mutations that resulted in similar, but not identical gene sequences. D. The two species are not closely related, but E. coli passed the similar gene sequences to C. acetobutylicum via horizontal gene transfer.
The pH of an acidic solution is.
a) less than 7 b) more than 7 c) equal to 7 d) cannot be determined