Which of the following is an obstacle to crystallization and structural analysis of membrane proteins?
a) membrane proteins are unstable in detergent-containing solutions
b) all of the choices are obstacles
c) membrane proteins are present in low numbers in the cell
d) membrane proteins are prone to aggregation
Ans: b) all of the choices are obstacles
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A G protein:
A. is a component of a signal-transduction pathway that is coupled to a G proteincoupled receptor. B. is composed of three subunits and is inactive when bound to GDP. C. releases GDP and binds to GTP when associated with an activated receptor. D. becomes deactivated when bound GTP is dephosphorylated to GDP. E. All of these choices are correct.
Which of the following is classified as a synovial joint?
a. joints between teeth b. joints between vertebrae c. knee joint d. joints between skull bones
Which of the following statements is incorrect about mutations?
A. Some mutations change the nucleotide sequence of a gene. B. Mutations change the bases in DNA. C. A mutation in a somatic cell will be passed on to subsequent generations. D. Without mutations, there would be no variation and no evolution. E. Some mutations remove nucleotides from a gene.
If a child develops an anterior pituitary tumor that reduces LH and FSH production, the child will
A) not develop gonads. B) produce excess testosterone or estrogen. C) experience delayed or disrupted puberty. D) develop secondary sexual characteristics before puberty. E) have decreased production of GnRH.