A key regulator of both glycolysis and gluconeogenesis is

A) hexokinase.
B) glyceraldehyde-3-phosphate.
C) alanine.
D) coenzyme (CoA).
E) fructose-2, 6-biophosphate.


A) hexokinase.

Biology & Microbiology

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What enzyme phosphorylates MAP kinase kinase?

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According to the old Linnaean scheme of classifying the living world into either animals or plants, any organism that could photosynthesize was considered a plant. What kingdoms in the new system contain photosynthetic organisms and what criteria are now used to group them?

What will be an ideal response?

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Some individual hormones have so many different effects because

1.they influence gene transcription. 2.they trigger a second messenger system that produces a cascade of effects. 3.there are a great many different cells in different tissues that have specific receptors for the hormone. 4.the hormone is carried throughout the body and only a small amount is needed to produce its effect. 5.all of the choices

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Phospholipids are important components of the ______.

a) waxy coverings on leaves b) ring structures of steroids c) double bonds in hydrocarbon chains d) plasma membranes of cells

Biology & Microbiology