A young dog has never had much energy. He is brought to a veterinarian for help and she decides to conduct several diagnostic tests
She discovers that the dog's mitochondria can use only fatty acids and amino acids for respiration, and his cells produce more lactate than normal. Of the following, which is the best explanation of the dog's condition? A) His mitochondria lack the transport protein that moves pyruvate across the outer mitochondrial membrane.
B) His cells cannot move NADH from glycolysis into the mitochondria.
C) His cells lack the enzyme in glycolysis that forms pyruvate.
D) His cells have a defective electron transport chain, so glucose goes to lactate instead of to acetyl CoA.
A
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The amino acid glycine (C3NO2H6) is a(an):
A. element B. organic molecule C. inorganic molecule D. vitamin
The phosphate transport system in bacteria imports phosphate into the cell even when the concentration of phosphate outside the cell is much lower than the cytoplasmic phosphate concentration
Phosphate import depends on a pH gradient across the membrane—more acidic outside the cell than inside the cell. Phosphate transport is an example of _____. A) passive diffusion B) facilitated diffusion C) active transport D) cotransport
Calvin cycle
What will be an ideal response?
A couple visits a fertility clinic to determine the basis of their difficulty in conceiving a child. They are surprised to hear they will both be tested for levels of two of the same hormones, which play roles in the ovarian cycle and sperm production. Which hormones are they?
A. Follicle-stimulating hormone (FSH) and luteinizing hormone (LH) B. Insulin and glucagon C. Oxytocin and luteinizing hormone (LH) D. Adrenocorticotropic hormone (ACTH) and corticotropin-releasing hormone (CRH)