Select the best response to the question. ?
A health care worker wearing gloves to prevent contact with a patient's blood ?will have an effect on which part of the chain of infection?
A) the source of infection
B) transportation of the pathogen
C) entry of the pathogen into the body
D)it does not affect the chain of infection
C
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Which of the following is NOT a part of the mitotic spindle apparatus in plants?
A. centrosome B. centrioles C. tubulin proteins D. kinetochore microtubules E. astral microtubules
If a cell had a single nonfunctional DNA repair enzyme, how would that cell be affected?
A) The cell could not possibly be viable without that DNA repair enzyme. B) Mutations during DNA replication would not be repaired, so replication and therefore division would not be possible. C) The cell's other DNA repair enzymes would most likely compensate and cell viability would be maintained. D) DNA polymerase would re-replicate any damaged regions of DNA.
Of all the species that have ever lived on Earth, how many have gone extinct?
a. less than 1% b. about 10% c. about 25% d. about 75% e. about 99%
Imagine that a cell can be treated with a drug that prevents proteins from undergoing large conformational changes. Which transport proteins would be unaffected by this drug treatment?
A. H+/sucrose symporter B. fructose uniporter C. aquaporin D. Na+/K+ ATPase E. All transport proteins would be affected.