The normal biota of the central nervous system includes ________.
A. Neisseria meningitidis
B. Herpes simplex I
C. The CNS has no normal biota.
D. Herpes simplex II
E. Streptococcus agalactiae
Answer: C
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You grow a culture of bacteria and split it into two culture tubes. One sample of bacteria you treat with calcium and the other is not treated. When you transform both samples with a plasmid, only the samples treated with calcium take up the plasmid. Which of the following best explains your results?
A. DNA is degraded in the absence of calcium. B. Calcium precipitates DNA, preventing it from being taken up by cells. C. The bacteria require calcium to grow. D. The calcium makes the bacterial membrane more porous to DNA. E. The bacteria use calcium as a source of energy to take up the DNA.
A plant stem would be considered to be
a. a shoot system. b. a tissue. c. a root system. d. a meristem. e. an organ.
Sugars, starch, and fiber are examples of what?
A) nucleus acid B) lipids C) carbohydrates D) proteins
Allele pairs are most likely to assort independently of one another when
A. they are sex-linked. B. they control related traits. C. they are on different chromosomes. D. they control unrelated traits. E. they are on the same chromosome.