If a particular noncoding sequence is repeated 100-10,000 copies per genome, this is considered ________ repetitive DNA
A. highly
B. moderately
C. low
D. All of the answer options are correct.
E. None of the answer options is correct.
B
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Over time, the carbon isotope 14C decays into
a. 12C. b. 14N. c. 12N. d. 13C. e. 12B.
How does sickle cell anemia reduce the blood’s ability to deliver oxygen to tissues?
a. The plasma membrane is too thick to allow oxygen to diffuse into sickle-shaped red blood cells. b. Sickle-shaped red blood cells puncture normal red blood cells, causing them to rupture and lose hemoglobin. c. Deformed red blood cells clog capillaries, preventing other red blood cells from passing through. d. Sickle cells contain a mutated form of hemoglobin that binds to half as many oxygen molecules.
Undiagnosed or untreated infections with Neisseria gonorrhoeae can progress to
A. bubonic plague. B. meningococcal meningitis. C. trench fever. D. pelvic inflammatory disease (PID). E. Q fever.
When leaf cells lose so much water that turgor pressure falls, the plant:
A. wilts B. closes up the protein channels through which water is lost C. takes in water from air D. dies E. starts to grow