During RNAi, what do miRNAs target for destruction?
A) heterochromatic regions of DNA
B) CpG islands
C) mRNAs
D) histones
E) ribosomes
C
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If a physician hears abnormal heart sounds while examining a patient with a stethoscope, this would most likely indicate a problem with
a. the firing of the sinoatrial node. b. the contraction of the heart muscle. c. the function of the heart valves. d. the electrical signal from the muscles of the ventricles. e. the flow of blood into the atria.
What would happen if activation energy barriers didn't exist?
A) Substrates would not bind properly to enzymes. B) Chemical reactions in the body would never occur. C) Coenzymes would not work, but enzyme function would not be affected. D) All chemical reactions in the body would proceed whether they were needed or not.
The hydrolysis of GTP to GDP carried out by tubulin molecules ________________
(a) provides the energy needed for tubulin to polymerize. (b) occurs because the pool of free GDP has run out. (c) tips the balance in favor of microtubule assembly. (d) allows the behavior of microtubules called dynamic instability.
Choose all that apply. A concentration gradient is exhibited when
_____ the room temperature is 34 degree Celsius and the outside air is 34 degrees Celsius. _____ intracellular fluid has 5% solute and extracellular fluid has 0.8% solute concentration. _____ during rest, muscle and liver cells contain high glycogen concentration and blood contains lower concentrations. _____ the pCO2 changes from 45 to 35 mmHg in the alveoli of lungs.