Which of these is the best description of a virus?
A. chemical complexes of RNA or DNA protected by a protein shell
B. a member of the kingdom Virusae
C. the smallest bacteria known
D. a noncellular living organism
E. an invasive cell that cannot stop reproducing
Answer: A
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Epigenetic modifications affect the nucleotide sequence of the DNA
a. True b. False Indicate whether the statement is true or false
Behavioral traits are useful in differentiating species because behaviors ____
a. are never genetically determined b. related to mating may create prezygotic isolation c. of fossilized specimens are easy to infer d. are independent of morphological characteristics e. are always learned
The enzymes used to cut genes in recombinant DNA research are called
A) replicases. B) restriction enzymes. C) spliceosomes. D) RNA polymerases. E) DNA polymerases.
Many of the antiviral drugs currently used to treat HIV/AIDS also interfere with an enzyme that helps mitochondria multiply. Treatment can therefore result in a decrease in the number of mitochondria found in certain tissues. Given this information, what might you expect to see in patients treated with antiviral drugs?
A. an increase in phosphofructokinase activity B. an increase in lactic acid levels C. an increase in oxidative phosphorylation D. an increase in NADH dehydrogenase activity