The polytene chromosomes of certain insect larvae
churn out copious amounts of gene products because
a. they are acetylated.
b. they are methylated.
c. they contain numerous side-by-side copies of
genes.
d. they have multiple promoter sites.
e. their histones are only loosely associated with
the DNA molecules.
Answer: c
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Vertebrates such as ____ have both exo- and endoskeletons
a. birds b. humans c. turtles d. lobsters e. fish
The use of a drug to prevent imminent infection is called ________.
A. synergism B. competitive inhibition C. lantibiotics D. prebiotics E. prophylaxis
Which of the following is a type of epithelial
tissue that is one layer thick?
a. stratified b. dense connective c. loose connective d. simple e. more than one of these
Under normal circumstances, several important types of genes control the activities of cells
Some of these genes (proto-oncogenes, tumor suppressor genes, and mutator genes) have critical roles in regulating cell growth and division, as well as repair of DNA during replication. Despite their important roles, mutations to any one of these genes alone do not induce a cancerous condition. Explain why.