Which type of nutrient can pass across epithelial cells without any expenditure of ATP?

A. protein
B. calcium
C. iron
D. magnesium
E. fat


Answer: E

Biology & Microbiology

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The products of the Calvin cycle are 3-carbon sugars

A. false B. true

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Down syndrome is associated with

a. mental retardation. b. abnormal skeletal development. c. weak muscle reflexes. d. slowly developing motor functions. e. all of these.

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A pear plant with the genotype Aa can produce gametes containing:a

either A or Aa. b. only the dominant A. c. only the recessive a. d. either A or a. e. either AA, Aa, or aa.

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Peptidoglycan is cross-linked between what constituents in gram-negative bacteria?

a. N-acetylglucosamine residues b. N-acetylmuramic acid residues c. phosphate groups d. DAP and D-alanine amino acids

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