The centromere of a chromosome separates during ________
A) prometaphase
B) anaphase
C) interphase
D) prophase
E) telophase
Answer: B
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Morris is a big, healthy bull. One spring, he fathers ten calves, but five of them are stillborn, their muscles very rigid in a phenotype called "contracture." Farm animals often mate with their close relatives. So, three of the dams (mothers of the stillborns) are also Morris' daughters, and the fourth is his half-sister. The large number of stillborns is most likely due to
A) recessive lethal alleles that occur as new mutations in the doomed offspring. B) dominant non-lethal alleles that Morris shares with his mates. C) lethal alleles that Morris shares with his mates. D) co-dominance between two lethal alleles.
Which of the following best describes substances that enter a plant through the root system?
A) They are dissolved in water. B) They are obtained from the air. C) They are organic molecules. D) They are brought in through stomata.
A mold is observed to have asexual conidia, sexual spores within a sac, and septate hyphae. It is most likely classified in the
A. Deuteromycota. B. Zygomycota. C. Basidiomycota. D. Ascomycota. E. Fungi Imperfecti.
Which of the following statements about "flesh-eating" streptococci is FALSE?
A) It is caused by a group A streptococcus. B) It is also known as necrotizing fasciitis because it travels along the fascia. C) It causes death in over 50% of cases. D) It is considered a common complication of pyoderma. E) It involves toxemia.