The sea squirts and lancelets have an inner chamber that expels water. This chamber is called the
(a) intestine.
(b) bladder.
(c) atrium.
(d) nephridium.
(c) atrium.
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A tobacco farmer is walking through her fields. On a leaf of one of her tobacco plants, she notices several small brown spots surrounded by what appears to be necrotic or dying tissue. What likely caused these spots and necrotic patches?
A. The plant is demonstrating a hypersensitive response. B. The plant was recently eaten by caterpillars. C. The plant is demonstrating a SAR response. D. The plant is producing terpenes.
The Kd values of antibody-to-antigen binding range from 10-12 M to 10-8 M. Antibody X binds to wild-type E. coli ssDNA-binding protein, showing a value of Kd =10-11 M
When antibody X binds to a mutant derived ssDNA-binding protein that contains a single amino acid substitution, a value of Kd = 10-7 M is determined. We can conclude that: A. the amino acid substitution has increased the affinity of antibody X. B. the amino acid substitution has decreased the affinity of antibody X. C. the amino acid substitution has increased the affinity of ssDNA-binding protein to DNA. D. the amino acid substitution has decreased the affinity of ssDNA-binding protein to DNA. E. None of these choices is correct.
Which molecule is the main structural component of biological membranes?
a. starch b. triglyceride c. protein d. phospholipid e. steroid
Burning fossil fuels has clearly resulted in ____
a. increases in atmospheric concentrations of carbon dioxide b. increases in extinction rates
c. increases in concentrations of carbon dioxide in soils d. increases in carbon retention in animals e. decreases in atmospheric concentrations of oxygen