Which of the following is correct about
melatonin?
a. it protects against certain cancers
b. it encourages the growth of certain cancers
c. it causes a decline in body temperature
d. all of these (a through c) are correct about
melatonin
e. one of these (a through c) is incorrect about
melatonin
D
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The microbiome contains all
A) organisms present on the skin. B) organisms within the digestive system. C) organisms present in and on the body. D) organisms present on the skin and in the digestive system.
It is estimated that humans can produce over 1.5 million different types of antibodies. Which of the following statements regarding this extraordinary variation is INCORRECT?
A. We inherit over 1.5 million different and distinct immunoglobulin genes from our parents at fertilization. B. V and J domains of antibody light chains are randomly joined. C. Random segments of DNA can be removed from antibody genes. D. V and J domains of antibody heavy chains are randomly joined. E. Cytosines in the variable regions of antibody genes can be converted to uracils via hypermutation.
A ________ is a compound made by a particular type of cell
a. carbohydrate b. biomarker c. nucleic acid d. fatty acid e. protein
After DNA unwinds and becomes single-stranded in a PCR reaction, the temperature is lowered to allow the ____ to
hybridize with the DNA template.
a. vectors b. primers c. tracers d. restriction enzymes e. DNA ligase