Which of the following is NOT a dehydration synthesis reaction?
a. amino acids forming proteins
b. glycogen forming glucose molecules
c. nucleotides forming DNA
d. fatty acids & glycerol forming a fat
Ans: b. glycogen forming glucose molecules
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A particular cell contains all of the standard histones but lacks several histone variants. Which of the following MAY be true of this cell?
A. The cell will be completely unable to remodel its chromatin. B. The cell will have an enhanced ability to chemically modify its histones. C. The cell will be unable to express any of its genes at all. D. The cell will express different sets of genes than other cells in the same organism E. The cell will not be able to divide.
You are studying with a classmate who asks you about the concept of a replacement rate. She wants to know what happens to a population if the replacement rate is reached? She also assumes the average human replacement rate is 2.0. What would you tell her?
A. When replacement rate is reached, the population declines. The replacement rate is greater than 2.0 to make up for declining birth rates. B. When replacement rate is reached, the population increases. The replacement rate is lower than 2.0 to make up for increasing birth rates. C. When replacement rate is reached, the population is in equilibrium. The replacement rate is equal to 2.0 to replace both mother and father. D. When replacement rate is reached, the population is in equilibrium. The replacement rate is greater than 2.0 because some individuals die before they reproduce. E. When replacement rate is reached, the population declines. The replacement rate is lower than 2.0 to make up for increasing birth rates.
Which of the following statements about the pathogen-specific response is true?
A. The pathways involved always trigger the hypersensitive response. B. The pathogen is recognized by its avr gene product. C. There is never a gene-for-gene response. D. If the R gene product is not triggered, no disease will occur. E. Avr and R gene pairs have been cloned in species pathogenized by microbes, fungi, and insects.
The cell-mediated immune response is most
effective against
a. cancer cells. b. viral infected cells. c. bacteria circulating in the blood. d. cancer cells and viral infected cells. e. bacteria circulating in the blood and viral infected cells.