The majority of ATP in aerobic respiration is produced by:
A) glycolysis. B) the electron transport chain. C) the Krebs cycle.
Answer: B
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What role do volatile secondary metabolites, released in response to herbivory, play in a plant?
a. They kill the insects that are feeding on the plant. b. They trigger the production of a foul-tasting chemical that deters insects from feeding. c. They attract wasps that parasitize insects that feed on the plant. d. They produce a scent that deters insects from approaching the plant. e. They cause cells in the infected region to commit suicide via a "hypersensitive" response.
What is the carrying capacity for the number of humans on the Earth?
1.1 billion
2.6 billion
3.10 billion
4.It cannot be predicted with any certainty.
Antibodies are
A) derived from vitamins. B) carbohydrate molecules. C) amino acid molecules. D) produced by T cells. E) protein molecules.
A section of a neuron's membrane becomes temporarily positive on the inside when:
A) ion channels open and potassium ions rush in. B) negatively charged proteins exit the cell. C) neurotransmitters enter the cell. D) ion channels open and sodium ions rush in.