Which stage of photosynthesis, if any, can function in the dark?
A) Stage 1 (the light reactions)
B) Stage 2 (the Calvin cycle)
C) Both Stage 1 and Stage 2
D) Neither Stage 1 nor Stage 2
B
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During respiratory exchange, carbon dioxide moves from the blood into the alveoli due to:
a. the presence of a permease, which removes carbon dioxide from the capillaries. b. potassium cotransport. c. diffusion down a concentration gradient. d. the air pressure of dissolved oxygen, which forces it out. e. the contraction of the diaphragm, which creates a vacuum that pulls it out.
In the fungus Neurospora, a metabolic pathway synthesizes the amino acid Z (which is essential for its survival) from the precursor W. The intermediates X and Y are also produced in this pathway
The enzymes E1, E2, and E3 catalyze three reactions in the process, as follows: E1 E2 E3 W ? X ? Y ? Z X-ray radiation can be used to create a mutant strain of Neurospora that has a defective gene sequence for E2. Based on this scenario, the mutant strain will survive on media that contain A) only Z. B) only X. C) only W or X. D) only Y or Z. E) W, X, Y, or Z.
MAPK and MEK are intracellular signaling proteins that mediate cell division induced by growth factors. When mutations in the normal MAPK and MEK genes result in an abnormally high level of MAPK and MEK activity and increases in the rate of cell division, then the mutated gene is called a(n)
A. spliceosome. B. transposon. C. tumor-suppressor gene. D. oncogene. E. None of the choices are correct.
Single nucleotide polymorphisms (SNPs) are organized into blocks called ____ and are inherited together
a. haplotypes b. chromosome assemblies c. DNA assemblies d. multifactorial genes e. threshold groups