Host specificity of a virus is due to
A. particular genes that it shares with the infected cell.
B. the presence of an envelope.
C. differences in size between the virus and the host cell.
D. the presence or absence of a cell wall on the host cell.
E. interactions between viral and cellular surface molecules.
Answer: E
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Which of the following would occur from a mutation in the gene's promoter region?
A. The sequence of the mature mRNA would change. B. The ability of pre-mRNA to be properly spliced would change. C. The ability of mRNA to be translationally regulated would change. D. The amino acid sequence of the translated protein would be altered. E. The rate of transcription may increase or decrease.
Which of the following statements is INCORRECT about triploid species?
A) Triploid species have an extra copy of one chromosome. B) Triploid species have three complete sets of chromosomes. C) Triploid species are usually infertile. D) Triploid species are an example of a polyploidy organism. E) All of these choices are correct.
Down syndrome involves trisomy ____.
A. 3 B. 5 C. 15 D. 19 E. 21
Fungal spores
A. cannot be seen in a light microscope. B. are produced by molds but not by yeasts. C. are only asexually produced. D. are only produced under harmful environmental conditions. E. are used to identify fungi.