In eukaryotes, there is a surveillance system that degrades nonfunctional mRNAs that contain termination codons in the coding region. Explain how mRNA degradation is coupled with translation
What will be an ideal response?
Ans: In nonsense-mediated mRNA decay, there is a degradation signal near the end of the mRNA that is masked when the mRNA is being translated. If there is a premature stop codon in the coding region, the ribosome dissociates and the degradation signal becomes accessible.
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Fishes that exhibit a sedentary lifestyle have ____ bodies
a. fusiform b. laterally compressed c. globular d. flattened e. streamlined
The procedure in which a single stain is used to visualize microorganisms is called ________ staining.
Fill in the blank(s) with the appropriate word(s).
The action of a white blood cell engulfing a
bacterium is a. pinocytosis. b. phagocytosis. c. exocytosis. d. endocytosis. e. phagocytosis and endocytosis.
Which of the following statements regarding the role of protein A in the pathogenesis of infections caused by Staphylococcus aureus is correct?
A. It is responsible for the rash in toxic shock syndrome. B. It is directly responsible for lysis of neutrophils. C. It is a bacterial surface protein that binds to the Fc portion of IgG. D. It converts hydrogen peroxide into water and oxygen. E. It is a potent enterotoxin.