Rosalind Franklin used which technique to
determine many of the physical characteristics
of DNA?
a. transformation
b. transmission electron microscopy
c. density-gradient centrifugation
d. X-ray diffraction
e. all of these
D
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The AIDS phase of HIV infection begins when the concentration of CD4 T cells in the blood drops below what concentration?
A) 2,000 cells per cubic millimeter B) 1,000 cells per cubic millimeter C) 500 cells per cubic millimeter D) 200 cells per cubic millimeter E) No CD4 T cells are observed.
The type of mutation that alters the nucleotide sequence of a gene but does not alter the amino acid sequence of the protein produced from that gene is called ________ mutation
A) missense B) silent C) nonsense D) frameshift
Amylase is an enzyme that breaks down starch. Why can't the same enzyme break down cellulose?
A. The enzyme cannot attack cellulose because of its helical shape. B. Cellulose molecules are much too large. C. Starch is made of glucose; cellulose is made of fructose. D. The bonds between the monosaccharide monomers in cellulose are much stronger. E. The monosaccharide monomers in cellulose are bonded together differently than in starch.
Sebum contains ________ which contributes to creating an inhospitable environment on the surface of the body
A) lysozyme B) collagens C) acids D) salts E) bile