Bartel's research group showed that an RNA replicase ribozyme could be created by _____
A) carefully synthesizing a novel ribozyme monomer by monomer based on the sequence of known ribozymes
B) creating large numbers of random RNA segments and testing each one to see if any replicase activity was present
C) starting with random components and allowing selection to result in molecules that were better and better at replicating
D) examining protein replicases and reverse-engineering an RNA molecule capable of doing the same job
Answer: C
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In summer squash, spherical-shaped fruit has been
shown to be dominant to elongated fruit. On one occasion two different spherical varieties were crossed and produced all disk-shaped fruits. When these hybrid disk-shaped fruits were crossed, they produced 75 disk-shaped fruits, 48 spherical fruits, and 9 elongated fruits. Explain these results. What will be an ideal response?
The osmotic potential of a plant refers to the
A) force exerted outward on a cell wall by the water contained in the cell. B) surfaces of larger molecules, such as those in the cell walls, exerting an attractive force on water. C) association between concentrations of solutes in cells and the rate of water loss. D) ratio of carbon fixed (photosynthesis) per unit of water lost (transpiration).
photosynthesis
What will be an ideal response?
Chemoreceptors located in the aortic and carotid bodies stimulate the respiratory control center in the brain when the blood ________ decreases.
A. pH B. PO2 C. PCO2 D. HCO3- concentration E. hemoglobin concentration