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.
Biology & Microbiology
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
Biology & Microbiology