Compare the two major deadenylation-dependent mRNA decay pathways in eukaryotes
What will be an ideal response?
Ans: Both pathways involve the deadenylation of the poly(A) tail to a length of about ten adenines. In one pathway, this triggers a decapping enzyme to remove the 5? cap and allows a 5? to 3? exonuclease to degrade the mRNA. In the other pathway, an exosome complex degrades the mRNA from 3? to 5?.
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True or false: Because water is so abundant on Earth, oxygen and hydrogen make up a majority of the known matter of the universe
A. true B. false
Over several generations in a population, inbreeding tends to
A. decrease the relative proportions of homozygotes. B. decrease the likelihood of heterozygotes. C. stabilize the balance of genotypes predicted by the Hardy-Weinberg equilibrium. D. All of the choices are correct.
Archaea reproduce primarily through ____
a. fusion b. binary fission c. sex d. meiosis e. cell joining
What is the key difference in defining "obese" and defining "overweight"?
A) An obese person always carries weight as excess muscle. B) An obese person always carries weight as excess fat. C) An overweight person always carries weight as excess fat. D) The two terms mean the same thing.