The centromere of a chromosome separates during ________

A) prometaphase
B) anaphase
C) interphase
D) prophase
E) telophase


Answer: B

Biology & Microbiology

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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.

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology