Why are humans not able to digest cellulose? a. humans lack the enzyme cellulase, which is required to hydrolyze the β(1→4) glycosidic bonds present in cellulose. b. humans lack the enzyme lactase, which is required to hydrolyze the lactose produced from the digestion of cellulose into glucose and galactose. c. humans lack the enzyme lactase, which is required to convert the galactose produced from the digestion of cellulose into glucose. d. cellulose is not naturally available to humans. e. none of the above; humans actually can readily digest cellulose?

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point

Regarding most of the narrator’s story, which word best describes the tone?

The empty trna moves off and picks up another matching amino acid from the cytoplasm in the cell. the anticodon of the trna, with its attached amino acid, pairs to the codon of the mrna, which is attached to a ribosome. this sequence is repeated until the ribosome reaches a stop codon on the mrna, which signals the end of protein synthesis. the ribosome forms a peptide bond between the amino acids, and an amino acid chain begins to form. when a second trna with its specific amino acid pairs to the next codon in sequence, the attached amino acid breaks from the first trna and is bonded to the amino acid of the second trna.