Which of the following statements is true?
a) since all cells carry out cellular respiration they contain mitochondria.
b) a cell cannot be subdivided into smaller units that maintain the living state.
c) plant cells contain chloroplasts and no mitochondria while animal cells contain mitochondria and no chloroplasts.
d) the cell membranes function is to prevent diffusion of any substances into or out of the cell.
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What kind of crystalline solid is graphite? o a. molecular solid b. metallic solid o c. network solid d. ionic solid

What is the surface temperature of the ocean where hurricanes form? greater than 80 celsius approximately 27 celsius at least 76 celsius less than 10.5 celsius

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.