Where are the mitochondria located in the sperm?

A. nucleus
B. tail
C. middle piece
D. cell membrane
E. head


Answer: C

Biology & Microbiology

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How would crowded conditions in cities favor spread of plague?

A. Plague is transmitted by rats-more people means more waste, and more waste means more rats. This would favor the spread of plague. B. Plague is transmitted by mosquitoes-more people close together gives an infected mosquito more chances to bite humans and transmit the causative agent, spreading plague. C. Plague is transmitted by infected fleas-these fleas may be found on rodents (such as rats). More people in an area means a greater chance of interactions with animals carrying infected fleas, increasing the spread of plague. D. Plague is transmitted by direct contact (e.g. skin to skin). More people in an area provides more chances for infected individuals to directly contact and infect other individuals, spreading plague.

Biology & Microbiology

During regulation by attenuation in the trp operon, if the pause and terminator loops form in mRNA, transcription is uncoupled to translation and protein synthesis is not occurring.

Answer the following statement true (T) or false (F)

Biology & Microbiology

What is the term for immunity gained by the transfer of antibodies across the placental barrier?  

A.  passive immunity B.  acquired immunity C.  humoral immunity D.  cell-mediated immunity E.  auto immunity

Biology & Microbiology

In an autosomal dominant disorder such as Huntington's disease, two carrier parents have the probability of passing

the gene onto ____ percent of their children.

a. 0 b. 25 c. 50 d. 75 e. 100

Biology & Microbiology