Streptomycin has its effect by causing _____________
A. DNA polymerase to malfunction D. errors in nuclotide assembly
B. errors in amino acid assembly E. a combination of more than one of these
C. breakage of hydrogen bonds in the DNA
molecule
B
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Based on the composition of the plasma membrane, how do you predict a protein with one section of hydrophobic amino acids and one section of hydrophilic amino acids would be situated in the membrane?
A) The hydrophobic portion of the protein could embed in the membrane, and the hydrophilic portion could extend into the cell. B) Both the hydrophobic and hydrophilic portions of the protein could embed in the membrane. C) This protein could not be found in the membrane. D) The hydrophilic portion of the protein could embed in the membrane, and the hydrophobic portion could extend into the cell.
Coarse sediment bottoms primarily support
a. infauna. b. interstitial animals. c. epifauna. d. pelagic organisms. e. seaweeds.
Although children believe that "holding my breath until I die" is possible, why should parents not be concerned by this threat?
A) As a child holds his or her breath, oxygen levels build, stimulating breathing by the brain stem. B) As a child holds his or her breath, oxygen levels decrease, stimulating breathing by the brain stem. C) As a child holds his or her breath, carbon dioxide levels decrease, stimulating breathing by the brain stem. D) As a child holds his or her breath, carbon dioxide levels increase, stimulating breathing by the brain stem.
A G-protein receptor with GTP bound to it _____
A) is in its active state B) signals a protein to maintain its shape and conformation C) will use cGMP as a second messenger D) directly affects gene expression