Which of the following nitrogen bases is NOT found in the RNA structure?

a. Adenine

c. Guanine

b. Cytosine

d. Thymine

What is believed to have happened to most of the moons volatile elements? A) they sank into the moons core. B) they evaporated due to violent impacts. C) they combined with lava flows to produce basalt.

Why is the amniotic egg considered an important evolutionary breakthrough? it has a shell that increases gas exchange. it allows deposition of eggs in a terrestrial environment?

What will most likely happen if a person does not consume the minium daily requirement of carbohydrates?

A pollen grain landing on a stigma of a flower of the same species produces a? a. gametophyte b. pollen tube c. flower d. stamen

Problems of world hunger are due to the green plant's inability to produce more food. True or False

What do all cells in a multicellular organism have in common

One of your friends has decided to make it his life's work to characterize all functional proteins, as he is convinced that all possible amino acid combinations can result in a protein. is it possible to confirm his hypothesis in this way

A membrane-bound compartment inside chloroplasts and cyanobacteria that is the site of the light-dependent reactions of photosynthesis is

Which food supplies only discretionary kcalories? a. bagel b. peanut butter c. grape jelly d. raisins?

Members of which two domains of life are composed of one or more prokaryotic cells?