Nucleotides, Carbohydrates, and Lipids

Question 1

G-C and A-T pairs

Answer 1

G-C: promote stronger pi-stacking interactions between adjacent bases than A-T pairs
Thus, double-stranded DNA sequences that are rich in G-C content tend to have higher denaturation (or melting) points than those that have less G-C content

Question 2

Phospholipids in the plasma membrane:

Answer 2

Move freely within a layer of the membrane but require an enzyme to move between layers

Question 3

Steroids

Answer 3

In general, contain 3 6-carbon rings fused together and fused to a fourth ring of 5 carbons