Rna is slightly different than dna. what nitrogenous base does rna contain instead of thymine?
a. guanine
b. cytosine
c. uracil

The image below shows a common blood pressure gauge. what does this device do? a. measures the level of oxygen present in the blood b. measures the pressure of blood when the lungs expand and compress c. measures the electrical activity of the heart d. measures the pressure of blood when the heart contracts and relaxes

Which substance contains thylakoids? a) nadph b)atp c)stroma d)chloroplast

The smallest parts of these that retain their original properties are called