Which characteristic of a chloroplast makes it appear green?
A. The outer membrane
B. The inner membrane
C. The stroma
D. The plastid
E. The chlorophyll
Answer: E
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In insects, primary symbionts are ________, while secondary symbionts ________
A) heritable / are transmitted horizontally B) able to replicate outside of the host / are obligate symbionts C) required for host reproduction / are not required for host reproduction D) obligate symbionts / have a free-living replicative stage
Positive cooperativity would most likely be observed when a protein is:
A. a single polypeptide with a Kd = 10-10. B. a single polypeptide with three ligand-binding sites of increasing Kd values. C. comprised of two identical subunits, each of which binds ligand. D. comprised of two ligand-binding sites where the Kd for the second site decreases after the first ligand binds. E. comprised of subunits A and B, where ligand binding to A facilitates ligand binding to B.
The ras proto-oncogene family is a group of related genes that slow or stop the progression of cancer
a. True b. False Indicate whether the statement is true or false
Endocarditis is often a consequence of bacteria attached to the heart valves. These microbes are not eliminated by circulating lymphocytes because
A. lymphocytes do not circulate through the heart valves to detect the presence of microbes. B. Gram-positive microbes don't have an exotoxin surface molecule to trigger an immune response. C. these microbes become covered in platelets and fibrin which is not recognized as foreign by the immune system. D. lymphocytes cannot engulf microbes attached to tissue.