The viral envelope is derived from the host ____________
a. periplasmic space
b. plasma membrane
c. peptidoglycan structure
d. cellulose
Answer: b. plasma membrane
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It is estimated that humans can produce over 1.5 million different types of antibodies. Which of the following statements regarding this extraordinary variation is INCORRECT?
A. We inherit over 1.5 million different and distinct immunoglobulin genes from our parents at fertilization. B. V and J domains of antibody light chains are randomly joined. C. Random segments of DNA can be removed from antibody genes. D. V and J domains of antibody heavy chains are randomly joined. E. Cytosines in the variable regions of antibody genes can be converted to uracils via hypermutation.
The condition in the host that results from pathogenic parasitic organism growing and multiplying within or on the host is called
A. an infection. B. pathogenesis. C. an infectious disease. D. All of the choices are correct.
Which of the following is most likely to be preserved as a fossil?
A. a complete large organism B. an organ like an eye or lung C. an organism that died on land D. a leaf or stem E. a bone or shell
Transcription starts when RNA polymerase binds to the
a. transcription unit. b. coding strand. c. promoter. d. transcription bubble. e. nontemplate strand.