The gag gene of the HIV genome encodes:
A. reverse transcriptase.
B. capsid.
C. integrase.
D. surface glycoprotein.
E. protease.
B
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Answer the following statements true (T) or false (F)
1. The movement of DNA polymerase continues unimpeded if a thymine dimer is present in the DNA double helix. 2. Cells are normally limited to one DNA repair system that corrects DNA mistakes. 3. Patients who suffer from xeroderma pigmentosum (XP) have a defective mismatch repair system. 4. Cancers originate from a single cell.
The number of parasites per individual is relatively high in most individuals and low in a few individuals
Indicate whether the statement is true or false
Which of the following objects must be the same sign as the covariance of variables X and Y?
A. Unconditional correlation of X and Y. B. Semi-partial correlation of Y and X holding Z constant. C. Partial correlation of X and Y holding Z constant. D. Semi-partial correlation of X and Y holding Z constant.
Which of these is an example of maintaining a constant internal environment?
A. sweating in the sun B. running from a dog C. eating a sandwich D. laughing at a joke E. bleeding from a cut