Under which of the following situations would receptor down-regulation most likely occur?
a. The number of G proteins is too high.
b. The concentration of a hormone is too high.
c. The cell is unable to manufacture cyclic AMP.
d. The concentration of a neurotransmitter is too low.
e. The number of receptors in the plasma membrane is too low.
b
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Consider the structure and function of DNA. Which of the following statements is true?
A. Because DNA contains carbohydrates, it provides structural support to the cells. B. The phosphodiester bonds that stabilize the association of the two strands are easily broken and reformed. C. If the sequence of one DNA strand is known, then the sequence of the other strand can be determined. D. Since DNA is made of phosphate groups that are ionized, it could easily pass through a cell membrane.
Asexually produced spores will result in offspring that ____
a. have no mating type b. are genetically distinct from the parent fungus c. are clones of the parent fungus d. have a different mating type from the parent fungus e. are unable to reproduce
Regine Verma and colleagues wanted to know if there was a sex difference in the human connectome. Which age
group(s) had a detectable a sex difference using DTI?
a. 8-13.3 years b. 13.4-17 years c. 17.1-22 years d. both 13.4-17 and 17.1-22 years e. all ages examined
A covalent bond:a
forms only between identical atoms. b. involves a sharing of only one pair of electrons. c. is always polar. d. may be polar or nonpolar depending on the atoms involved. e. always forms between identical molecules.