What is the main digestive function of the pancreas?
A) to produce digestive enzymes and bile salts
B) to produce digestive enzymes and an alkaline solution
C) to produce bicarbonate-containing mucus
D) to aid in the control of cholesterol
Answer: B
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Epidemics of meningitis appear to involve
A. Streptococcus pneumoniae. B. Haemophilus influenzae. C. Neisseria meningitidis. D. Streptococcus pyogenes.
Some of the stages of meiosis are listed under letters a
through e below. For statements 62–68, select the best choice of these stages. a. prophase I b. metaphase II c. anaphase I d. anaphase II e. telophase I E 62. Pairing of homologues occurs during this stage. E 63. Recombination via crossing over occurs during this stage. D 64. By the end of this phase the number of homologous chromosomes is reduced in half. M 65. During this stage the sister chromatids begin to separate. D 66. Following this phase each individual cell is haploid. D 67. During this phase homologues separate. D 68. New genetic combinations upon which natural selection can act are present after this stage.
Which of the following statements concerning nucleotide excision repair is FALSE?
a. It is a type of mismatch repair. b. It involves a nuclease. c. It involves a DNA polymerase. d. It involves DNA ligase. e. It is implicated in xeroderma pigmentosum.
Predict the outcome of an F+ to F- mating if the F+ cell lacked a functional tra operon.
A. Conjugation would not occur because there would be no contact between the F+ and F- cells. B. Upon entering the recipient, the F factor would be unable to integrate into to host chromosome. C. Conjugation would occur, but the F- recipient could not become Hfr. D. There would be no effect on conjugation.