When Streptococcus pneumoniae are exposed to an antibiotic, the bacteria try to pump the antibiotic out of their cells. Which of the following mechanisms is most likely used by the Streptococcus pneumoniae to pump the antibiotic out of their cells?
A. active transport
B. diffusion
C. facilitated diffusion
D. osmosis
Answer: A. active transport
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A human fetus has no resident microbial population
Indicate whether this statement is true or false.
Humans store glucose as a highly branched polymer in the liver or muscle cells. What is this polymer called?
a. glycogen b. galactosidase c. cellulose d. alanine
Which statement with regard to Sertoli cells is FALSE?
a. They secrete hormones. b. They are joined by tight junctions. c. They form a blood-testis barrier. d. They phagocytize discarded sperm cytoplasm. e. They facilitate the movement of sperm into the blood
In comparing mitosis and meiosis, which statement is true?
A. Meiosis I is more like mitosis than is meiosis II. B. Both processes result in four cells. C. Crossing over of homologues occurs in both. D. Chromatids are present only in mitosis. E. Meiosis II resembles mitosis.