Alvin is studying a model of the chemical structure of a common nucleic acid. He observes that the nucleic acid consists of four nitrogenous

bases: adenine (A), cytosine (C), guanine (G), and uracil (U).

Alvin's observation most strongly supports which of these conclusions?

A. The nucleic acid is a form of RNA, and is not DNA.

B. The nucleic acid is either mRNA or rRNA, but not tRNA.

C. The nucleic acid is either RNA or DNA.

D. The nucleic acid is DNA, and is not RNA.

A) option is correct

Explanation:

RNA is a linear polymer of ribonucleotides Sugar in RNA is ribose instead of deoxyribose which is present in DNA The four nitrogenous bases present in RNA are adenine, cytosine, guanine and uracil whereas that in DNA are adenine, cytosine, guanine and thymineRNA molecules carry genetic information from DNA to proteins, cannot transmit from one generation to next generation as a genetic material Due to steric hindrance by the 2'-OH group of ribose sugar, RNA unable to form double helix

Characteristic expected of mineral from lava at earth's surface

phaneritic textures in which phaner means visible so phaneritic textures are standard of impertinent volcanic rocks. these rocks crystallized gradually under the surface of earth. when the magma cools deliberately then the ores have chance to develop and produce long crystals.

Ibelieve the answer is a-broad because that is a leafed plant.