Which statements about collagen molecules are correct? 1 Both types of secondary structure occur within the molecules
2 Large numbers of hydrogen bonds stabilize the molecule
3 repeated amino acid sequences determine the tertiary structure

A.1,2 and 3 B.1 and 2 only C.1 and 3 only D. 2 and 3 only

above statement is not a true statement about the open ocean because the open ocean has low levels of nutrients. most of the photosynthetic activity on earth occurs in the open ocean within the photic zone. organisms in the deep ocean are exposed to frigid temperatures and total darkness but it does not begin at the low-tide mark.