You are working on a team that is designing a new drug. For this drug to work, it must enter the cytoplasm of specific target cells. Which of the following would be a factor that determines whether the molecule selectively enters the target cells?
A) hydrophobicity of the drug molecule
B) lack of charge on the drug molecule
C) similarity of the drug molecule to other molecules transported by the target cells
D) lipid composition of the target cells' plasma membrane
C
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Which of the following cannot be a product of transcription?
A. protein B. mRNA C. tRNA D. rRNA
If a plant contains seven bud scale scars this would indicate that the plant is ________ years old.
A. seven B. four C. fourteen D. You cannot tell the age of a plant by the number of bundle scars.
If red blood cells are taken from the body and placed in a hypertonic solution, what happens to the cells?
A) The cells remain unchanged due to equal solute concentrations inside and outside the cells. B) The cells remain unchanged due to equal water concentrations inside and outside the cells. C) They become white blood cells. D) The cells swell and burst because water moves into them. E) The cells shrivel up because water leaves them.
A famous example of allometry, the antlers of the extinct Irish elk ( Megaceros giganteus)
A. were expressed at a different position from those of any other deer. B. were smaller, relative to body mass, than those of any other deer. C. were larger, relative to body mass, than those of any other deer. D. grew at the same rate as the deer's body mass. E. were expressed at a different time during ontogeny from those of any other deer.