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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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.
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.