Describe two processes that would result in a triploid zygote
What will be an ideal response?
One process resulting in a triploid zygote is when homologous chromosomes fail to separate during meiosis I, the division in meiosis II will produce diploid gametes. The fertilized egg produced by fusion of this diploid gamete with a normal haploid gamete will be triploid. Another process is the simultaneous fusion of a haploid egg with two haploid sperm. This process is called dispermy.
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Which is a true statement regarding the size of PCR products?
A. Since the number of DNA products extends beyond each primer with each cycle, when PCR is completed, the majority of products are of various sizes. B. Since the number of DNA products ending exactly between both primers increases with each cycle, when PCR is completed, the majority of products are of similar size. C. Since the length of primers increases with each cycle, when PCR is completed, the majority of products are of various sizes. D. None of the choices are correct.
Differences between the amino acid sequence of human cytochrome c and that of 5 other species are given in the choices below. Based on these data, humans are most closely related to
A) bullfrogs: 20 amino acid differences. B) pigeons: 12 amino acid differences. C) fruit flies: 24 amino acid differences. D) yeast: 42 amino acid differences.
Which of the following describes a major component of the Staphylococcus aureus cell wall. It binds to the 'Fc' moiety (stem of the Y-shaped anitoby) of IgG, exerting an antiopsonin (and therefore strongly antiphagocytic) effect
A. capsule B. protein A C. cytolytic exotoxins D. superantigen exotoxins E. DNAse enzymes
The ____ is an extension of the upper body wall in mollusks.
A. radula B. mantle C. gill D. lung E. siphon