Which always contains carbon, hydrogen and oxygen?
i. carbohydrate
ii. protein
iii. fat
a. i and ii only
b. i and iii only
c. ii and iii only
d. i, ii and iii

For each of the following, decide whether the statement describes photosynthesis, cellular respiration, or both. releases energy in the form of atp. stores energy in glucose molecules. performed by producers. performed by consumers.

Which way do the nitrogenous bases in dna pair up? a. a and g; t and c b. a and c; t and g c. a and t; g and c d. a and a; t and t; g and g; c and c

Cells destroy body cells infected by a virus or bacteria. killer t t memory t none of the above