Someone who inconspicuously harbors a pathogen and spreads it to others is a ________.
A. reservoir
B. carrier
C. fomite
D. source
E. vector
Answer: B
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The misshapen version of a protein that causes properly folded proteins to misfold is called a ________.
A. virus B. prion C. viroid D. capsid
Some researchers argue that short telomeres actually facilitate a longer life span in mammals. The reasoning for this argument includes the idea that ________
A) the activity of telomerase expression?the enzyme that can restore lost bits of telomeres?is repressed B) a reduction in the telomere size for every DNA replication event can serve as an accurate counting mechanism for the number of times a cell has divided C) reducing the number of divisions a cell will go through will also reduce the likelihood of mutation events occurring in the cell's DNA D) All of the above are included in this idea.
Which of the following molecules has an enzymatic site that splits ATP during muscle contraction?
a. troponin b. myosin c. actin d. inositol triphosphate e. tropomyosin
Despite being correct about the first two tenets of the Cell Theory, Schleiden and Schwann made an error about another central feature of cells. What was their error?
A) they both agreed that cells could arise from noncellular materials B) they stated that all cells were immortal C) They claimed that all cells had nuclei through their entire existence D) They claimed that all cells were exactly the same in every detail E) They stated that all cells were smaller than 2 micro in diameter