Chlorosis in plants is a condition best explained by
A. lack of oxygen.
B. lack of soil moisture.
C. lack of water.
D. lack of carbon dioxide.
E. lack of certain minerals.
Answer: E
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Four features help define __________: a notochord, a dorsal hollow nerve cord, a pharynx with gill
slits, and a tail extending past the anus. Fill in the blank(s) with the appropriate word(s).
The most inclusive level of organization listed here is
a(n) a. organ. b. atom. c. molecule. d. multicelled organism. e. cell.
What effect is warming predicted to have on migration behavior?
A) Birds will depart for migration earlier and return later. B) Birds will depart for migration later and return later. C) Birds will depart for migration earlier and return earlier. D) Birds will depart for migration later and return earlier.
A group of membrane proteins can be extracted from membranes only by using detergents
All the proteins in this group have a similar amino acid sequence at their C-terminus: -KKKKKXXC (where K stands for lysine, X stands for any amino acid, and C stands for cysteine). This sequence is essential for their attachment to the membrane. What is the most likely way in which the C-terminal sequence attaches these proteins to the membrane? (a) The cysteine residue is covalently attached to a membrane lipid. (b) The peptide spans the membrane as an ? helix. (c) The peptide spans the membrane as part of a ? sheet. (d) The positively charged lysine residues interact with an acidic integral membrane protein.