The pancreatic secretions governing glucose
levels are precisely controlled by
a. neural connections to the pancreas.
b. the blood-brain barrier.
c. cooperative interactions.
d. feedback mechanisms.
e. releasing factors
D
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Removing plants from an area, as we do when we harvest crops, removes a great deal of nitrogen. One of the ways farmers enable soils to naturally recover is:
A. adding human made fertilizer. B. planting the field with legumes. C. adding bacteria to the soil. D. leaving the soil bare, removing any plants that would consume nitrogen.
Which of the following correctly describes the roles of Mg2+ ions in the polymerase reaction?
A. The first Mg2+ deprotonates the aspartate in the active site. B. The first Mg2+ deprotonates the 3'-OH of the previous nucleotide. C. The second Mg2+ deprotonates H2O in the active site. D. The second Mg2+ stabilizes PPi by protonation. E. None of these choices is correct.
Individuals with the O blood group are known as universal donors because the Gal and GlcNAc groups that are recognized by the antibodies in A, B, and AB in other individuals are missing
Which of which of the following types of erythrocyte plasma membrane components lacks these GlcNAc groups? A) a glycoprotein B) a glycolipid C) glycophorin D) a GPI-anchored protein E) a glycocalyx protein
Consider the possibility that we discover a gene that regulates both the amount of root hairs and where root hairs grow on a root tip. Since the surface area provided by root hairs is so critical to their uptake of water and nutrients, expanding their growth area seems a great advantage. However, which of these might be a problem?
A. Growth of root hairs in the root cap would cause them to be shredded off since this area takes substantial abrasion. B. Growth of root hairs in the zone of cell division would interfere with root cell proliferation. C. Growth of root hairs in the zone of elongation would cause them to be shredded off as they anchored in soil and the root lengthened. D. All of these choices pose a problem.