What is mrna?

a. a dna sequence at the start of a gene

b. an rna segment that does not code for proteins

c. an rna copy of a dna gene

d. a dna strand that cannot be transcribed

Atypical human cell is approximately 12.00 μm in diameter and enclosed by a membrane that is 5.000 nm thick. (a) what is the volume of the cell including the membrane? (b) what is the volume of the cell membrane? (c) what percent of the total volume does its membrane occupy? to simplify the calculations, model the cell as a sphere. enter your answers using four significant figures.

What are the doorways into and out of cells, attached to the membrane, and built in the rough er.

Match each term to its best definition? sedimentary depositional enviornment