Which of the following is true about nucleic acids?
i. nucleic acids always consist of a five-carbon sugar, a nitrogenous base, and one or more phosphate groups.
ii. both dna, which stores genetic information and encodes protein sequences, and rna, which is involved in the direct production of proteins, are nucleic acids.
iii. nucleic acids are usually insoluble in water and are used for long term energy storage.
iv. glucose, cellulose, and starch are examples of nucleic acids found in most cells.
answer choices:
a. ii only
b. i and ii only
c. i, ii, iii, and iv
d. i, iii, and iv only

Mouse liver cells were homogenized and the homogenate subjected to equilibrium density-gradient centrifugation with sucrose gradients. fractions obtained from these gradients were assayed for marker molecules (i.e., molecules that are limited to specific organelles). the results of these assays are shown in the figure. the marker molecules have the following functions: cytochrome oxidase is an enzyme involved in the process by which atp is formed in the complete aerobic degradation of glucose or fatty acids; ribosomal rna forms part of the protein-synthesizing ribosomes; catalase catalyzes decomposition of hydrogen peroxide; acid phosphatase hydrolysis monophosphoric esters at acid ph; cytidylyltransferase is involved in phospholipid biosynthesis; and amino acid permease aids in transport of amino acids across membranes. a) name the marker molecule and give the number of the fraction that is most enriched for each of the following cell components: lysosomes; peroxisomes; mitochondria; plasma membrane; rough endoplasmic reticulum; smooth endoplasmic reticulum.

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