What base is found in DNA?

A. adenine

B. guanine

C. cytosine

D. thymine

Which description best explains Watson and Crick's DNA model? DNA is a single-stranded molecule that has nitrogenous bases toward its exterior. DNA is a double helix made of two strands linked together with hydrogen bonds.

Assuming the carbon cycle is a closed system, which of the following statements is true?

What are the four carbon macromolecules the body uses and makes?

Which step is part of the formation of a batholith? Heat and pressure change a pluton into metamorphic rock. A single pluton enlarges into a huge mass by melting the rock around it. Lava flows across a mountain or plain, and then hardens into rock.

What kind of solar energy method is shown in the diagram? A.) Passive solar heating B.) Active solar heating C.) Photovoltaic cell D.) Parabolic trough

Cómo clasificarías la Adenina

Why did sumerians need to trade

Which is a sustainable practice? wind farms clear cutting flood irrigation overfishing

What happens in each phase of miosis.

Purple petal color in pea plants is dominant to white petal color. Two heterozygous pea plants are crossed. What ratio of the offspring will have white petals? Express this in a percentage.