Which mollusc group includes primarily sedentary animals that use mucus-coated gills to trap fine food particles?
A) cephalopods
B) gastropods
C) chitons
D) bivalves
Answer: D
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Of the following, which is the most current description of a gene?
A) a unit of heredity that causes formation of a phenotypic characteristic B) a DNA subunit that codes for a single complete protein C) a DNA sequence that is expressed to form a functional product: either RNA or polypeptide D) a DNAâ€"RNA sequence combination that results in an enzymatic product E) a discrete unit of hereditary information that consists of a sequence of amino acids
Mice lacking plakoglobin have skin defects but usually die from
A) cancer. B) muscular dystrophy. C) heart failure. D) Ehlers–Danlos syndrome. E) scurvy.
One type of illegal doping in sports is the abuse of anabolic steroids such as testosterone. Doctors measure the testosterone (T) to LH ratio in athletes' urine to detect such doping. Why is this an effective indicator?
A. Testosterone upregulates LH, so the doping athlete will have an unusually low T/LH ratio. B. LH has negative feedback onto testosterone, so the doping athlete will have an unusually high T/LH ratio. C. LH downregulates testosterone, so the doping athlete will have an unusually low T/LH ratio. D. Testosterone has negative feedback onto LH production, so the doping athlete will have an unusually high T/LH ratio.
All of the following pertain to Neisseria meningitidis, except
A) It causes serious meningitis B) It is a common cause of bacterial pneumonia C) It is more easily transmitted in day-care facilities, dorms, and military barracks D) Virulence factors include a capsule, pili, endotoxin, and IgA protease E) The reservoir is the nasopharynx of human carriers