Some of the structural components of Staphylococcus act as virulence factors. Which of the following components inhibits chemotaxis and phagocytosis, inhibits proliferation of mononuclear cells?
A. Capsule
B. Peptidoglycan
C. Protein A
D. Teichoic acid
E. Slime layer
Answer: A. Capsule
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In humans and other mammals, dosage compensation is achieved by:
A. males transcribing double the normal amount of copies of X-chromosome genes. B. females decreasing transcription of both X chromosomes by ½. C. females eliminating one X chromosome in each cell. D. females inactivating the paternal X chromosome in each cell. E. females randomly inactivating one X chromosome in each cell.
What enzyme is used to synthesize daughter strands of DNA during PCR?
A) replicase B) DNA polymerase C) RNA polymerase D) Taq polymerase
A reddish chemical, lipofuscin, is found in greater quantities in cells of older people than in those from younger people. This chemical should be broken down in the cells. Which specific type of organelle is not working as well in the seniors?
A) lysosome B) rough endoplasmic reticulum C) mitochondrion D) nucleus
Which of the following types of animal virus requires RNA-dependent RNA transcriptase to be replicated?
A) +ssRNA viruses B) ssDNA viruses C) -ssRNA viruses D) retroviruses E) dsDNA viruses