AP BIOLOGY

Detailed explanation-1: -Human cells contain natural double-stranded RNAs with potential regulatory functions.

Detailed explanation-2: -The human genome encodes both simple and higher order SSBs: the simple SSBs are represented by human single-stranded DNA binding proteins 1 and 2 (hSSB1 and 2) and the mitochondrial SSB (mtSSB), while higher order SSBs are represented by heterotrimeric RPA.

Detailed explanation-3: -DNA is generally double-stranded and RNA is generally single-stranded (though both can exist in either form).

Detailed explanation-4: -Unlike DNA, however, RNA is most often single-stranded. An RNA molecule has a backbone made of alternating phosphate groups and the sugar ribose, rather than the deoxyribose found in DNA.