Staphylococcus aureus produces ________, leading to fibrin clots that protect them from attack by host cells
A) collagenase
B) coagulase
C) lipase
D) amylase
Answer: B
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Which of the following statements correctly describes a difference between sexual and parasexual reproduction?
A. Crossing over occurs during mitosis in parasexual reproduction and meiosis in sexual reproduction. B. Parasexual reproduction does not include a heterokaryotic stage, whereas sexual reproduction does include a heterokaryotic stage. C. In sexual reproduction, karyogamy produces a diploid nucleus, whereas in parasexual reproduction karyogamy produces a dikaryotic nucleus. D. The haploid chromosome number is restored by meiosis in parasexual reproduction and by mitosis in sexual reproduction. E. Parasexual reproduction does not generate genetic diversity, whereas sexual reproduction does generate genetic diversity.
All EXCEPT which of the following are monocots?
a. orchids b. wheat c. maple d. grass e. palms
In leaves, excess sugar molecules may enter companion cells of phloem through ________.
A. vessel elements B. active transport proteins C. sieve tubes D. perforation plates E. pits
The white-eyed gene in Drosophila is recessive and sex-linked. Assume that a white-eyed female is mated to a wild-type male. What would be the phenotypes of the offspring?
A) all wild type B) females wild type, males white eyed C) all white eyed D) females white eyed; males wild type E) females half wild type, half white eyed; males white eyed