How does an integrase resemble a topoisomerase and how do they differ?
What will be an ideal response?
Ans: Both enzymes break one strand of DNA at a time and reconnect broken ends. Topoisomerases reconnect the same two ends that were originally broken (after manipulating them), while integrases join nicked ends from different duplexes.
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If animals were unable to produce pectin, what effect would this have on their epithelial tissues?
A. It would have no effect on epithelial tissue structure or function. B. Epithelial cells would be unable to adhere to one another. C. Epithelial cells would be unable to communicate with one another. D. Epithelial cells would be unable to adhere to the extracellular matrix. E. Epithelial cells would be unable to form organized sheets of cells.
Typhoid fever is caused by a species of:
A) Campylobacter. B) Escherichia. C) Salmonella. D) Shigella.
When the end product of a pathway inhibits catalysis of the first step of that pathway, this phenomenon is called
A. feedback inhibition. B. metabolic channeling. C. reversible covalent modification. D. non-competitive inhibition.
What is the consequence of a deleterious mutation becoming fixed in a population?
a. Muller's ratchet will automatically move an additional turn. b. Recombination cannot remove the mutation. c. Mating between unrelated individuals can produce offspring that does not carry the mutation. d. Muller's ratchet may move an additional turn. e. B and D.