Speculate why the half-life of mRNA is short, while the half-lives of rRNA and tRNA are long
What will be an ideal response?
Answer: An important feature present in rRNA and tRNA yet lacking in mRNA is the secondary structures that make them more difficult to degrade by ribonucleases. These additional bonds also require more energy input to degrade them. Based on their function in the cell, mRNA is just a messenger and should thus be temporary. rRNA and tRNA are stable enzymatic molecules that are continuously catalyzing reactions in the cells.
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Bioluminescent patterns can indicate: a. species
b. gender. c. hunting strategies. d. all of these choices.
Mature sperm is(are) indicated by
a. B. b. C. c. D. d. E. e. none of these.
The sex-determining chromosomes of a human male are the
A) Z and Z chromosomes. B) Y and Z chromosomes. C) X and Y chromosomes. D) Y and Y chromosomes. E) X and X chromosomes.
What can happen if an enzyme is altered, even slightly?
A) It will continue to catalyze reactions, but at a slower rate. B) It will still catalyze reactions, but only at a higher temperature. C) The amount of activator required to "turn on" the enzyme will need to increase. D) Its active site may change, causing the enzyme to stop functioning. E) It will catalyze reactions too quickly, potentially causing illness for the individual.