All commercially produced bananas are seedless because the plants that bear them are ____
a. triploid
b. haploid
c. treated with colchicine
d. lacking ovaries
e. grown by tissue culture propagation
a
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Which of the following statements about the human male reproductive system is false?
A. Constriction of the arteries and dilation of the veins in the penis causes a change in blood flow that leads to an erection. B. The scrotum hangs outside of the abdominal cavity because spermatogenesis requires cooler temperatures. C. Sperm become motile in the epididymis. D. Both sperm and urine leave the body through the same structure. E. The head of the penis is known as the glans penis.
How is initiation at oriC regulated in bacteria?
A. SeqA binds to hemimethylated DNA and sequesters the newly replicated origin. B. DnaA-ADP, formed when DnaA hydrolyzes its ATP, cannot maintain the destabilization of the origin so the closed complex reforms. C. The Hda protein binds the ? clamp causing DnaA to hydrolyze its ATP. D. RNA polymerase activity produces superhelical twisting that promotes melting of the origin by DnaA. E. All of these choices are correct.
After food has passed from the stomach, where does it move next?
a. large intestine b. small intestine c. colon d. liver
One benefit of sexual reproduction over asexual reproduction is that:a
more offspring can be produced. b. the offspring are all identical to the parents. c. the interaction of the genes from both parents brings about genetic variation. d. evolution will occur at a slower rate when there are two parents. e. there is less variation from generation to generation.