Glyceraldehyde 3-phosphate dehydrogenase operates by stripping a hydride ion from its substrate. Which molecule is the recipient of the proton and two electrons during this transfer?
(a) oxygen
(b) acetyl CoA
(c) NAD+
(d) FADH
(c)
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Many structures and organs in the body are lined by epithelial tissue, and this layer of tissue
can vary in thickness from a single layer of cells to multiple layers of cells. Based on function, which of the following do you think will have the most cell layers?
a. skin b. lungs c. blood vessels d. both lungs and blood vessels
The association of four subunit peptides in a fully functional molecule of hemoglobin is a good example of ____ protein structure
a. primary b. secondary c. tertiary d. quaternary e. aggregate
Which of the following is a disadvantage of sexual reproduction?
a. It produces genetically diverse offspring. b. Large numbers of offspring can be produced quickly. c. Only half the population can produce offspring. d. Organisms have both male and female reproductive systems.
This type of cell has pits and pit plugs
a. xylem b. phloem c. parenchyma d. sclerenchyma e. collenchyma