The amount of energy needed for a reaction to take place is the activation energy. enzymes can lower the activation energy of a chemical reaction. which of the following describe a way that this could happen? a. the enzyme separates molecules from each other. b. molecules can be brought together so they can bond more easily. c. more substrate is added by the enzyme. d. the enzyme distributes atp to cells and then is destroyed.

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.

Which best describes the nucleus of an atom a. it is where all of the particle s of the atom are located b. it is the negatively charged part of the atom c. it is where the electrons and the protons are located d. it is the part of the atom with the greatest mass

All ova contain sex chromosomes corresponding to: x y xx xy