In step 4 of glycolysis, a six-carbon sugar (fructose 1,6-bisphosphate) is cleaved to produce two three-carbon molecules (dihydroxyacetone phosphate and glyceraldehyde 3-phosphate). Which enzyme catalyzes this reaction?
(a) aldolase
(b) phosphoglucose isomerase
(c) enolase
(d) triose phosphate isomerase
(a)
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Which of the following structural features of plants would not be expected to reduce transpiration?
A) thick cuticle on leaves and stems B) abundant epidermal hairs on leaves and stems C) sunken stomata D) stomata on upper and lower surfaces of the leaves E) reduced leaf size
The cytoplasmic membrane of Thermoplasma contains a lipopolysaccharide-like material called lipoglycan which
A) behaves like peptidoglycan and creates a strong cell wall. B) forms a monolayer that stabilizes the cytoplasmic membrane. C) contains ether linkages. D) contains ether linkages and forms a monolayer that stabilizes the cytoplasmic membrane.
Which of the following is the best evidence that supercoiling is an intrinsic property of double-stranded DNA molecules?
A. Strand separation during transcription and replication introduces supercoiling. B. Purified plasmid DNAs are supercoiled even though all proteins are removed. C. When two strands of an entwined rubber band are pulled apart they will twist into supercoils. D. Linear fragments of double-stranded DNA are not supercoiled. E. None of these choices is correct.
Cell division in the apical meristems at the tips of a plant that results in increases in height or length is called
A. primary growth. B. herbaceous growth. C. mitotic growth. D. vascular cambium growth. E. secondary growth.