____ have a body temperature similar to that of their surroundings
a. Endotherms
b. Ectotherms
c. Mice
d. Humans
e. Birds
ANSWER: b
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A mutation in yeast makes it unable to convert pyruvate to ethanol. How will this mutation affect these yeast cells? The mutant yeast cells will _____
A) be unable to grow anaerobically B) grow anaerobically only when given glucose C) be unable to metabolize glucose D) die because they cannot regenerate NAD+ from NAD E) metabolize only fatty acids
Why would a scientist trying to isolate osteoblasts look between the periosteum and the bone in a young animal to find them?
What will be an ideal response?
What is typically the result of receptor up-regulation?
a. A hormone's signal is amplified. b. The number of receptors decreases. c. The sensitivity of a cell to a hormone decreases. d. The number of genes that code for a receptor increases. e. The concentration of hormone molecules in the blood increases
Which of the following is not a potential outcome of a gene duplication?
A) they may result in gene redundancy B) they may result in providing the raw material for evolution C) they may lead to the development of gene families D) they may produce phenotypic variation E) they may lead to translocation cross formation during synapsis