Which of the following is a source of carbon skeletons that are used in the synthesis of amino acids?
A. Acetyl-CoA
B. Glycolysis intermediates
C. TCA cycle intermediates
D. All of the choices are correct.
Answer: D
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A photoreceptor in seeds detects the ratio of red to far-red light, preventing seeds from germinating when:
A. it is too warm. B. it is too cold. C. they are in the shade of another plant. D. they are in direct sunlight. E. it is too dry.
What cells are phagocytes that can also present antigens to TH cells?
A. B cells B. macrophages C. plasma cells D. T cells E. monocytes
What is the probability of rolling two six-sided dice and obtaining an odd number on at least one die?
What will be an ideal response?
The relative number of mitochondria in a cell would be a general indicator of the extent of ________ occurring within that cell.
A. facilitated transport B. osmosis C. active transport D. osmosis and diffusion E. diffusion