How did Watson and Crick determine base pairing?

A. They analyzed the work of Phoebus Levene.

B. They used Chargaff's rule to fit the bases together.

C. They broke the hydrogen bond.

D. They observed the pairing under a microscope.

A rabbit runs away from a dog. Which process causes the production of most of the energy the rabbit uses to run away? A. The Krebs cycle B. The Calvin cycle C. Glycolysis D. Electron transport

Which characteristic best describe scientific thinking

Epinephrine is a hormone released from the adrenal gland of the body, most often in a stressful situation. It is known as the "fight-or-flight" hormone. One way that it causes a response in the body is to activate receptors on muscle cells.

Determine the net charge of the following tetrapeptide at pH 13.5 that contains the amino acids represented by the single letters "MRPH", such that M is at the amino-terminal end of the peptide and H is at the carboy-terminal end. A. + 2 B. + 1 C.

Why does cell theory meet the definition of a scientific theory? Select one: It states that cells form in the body, but it is not supported by scientific research. It states that cells form under certain conditions, but does not explain why.

How much of a person's weight is water?

What are the two components of the central nervous system in vertebrates?

A river has a large amount of algae growing. Which most likely caused the growth?

Which of the following statements is true? Natural energy sources are nonrenewable and being depleted. Current fuels are not polluting the air. Mercury released into aquatic ecosystems comes from rock erosion.

Which causes a decrease in the amount of dissolved oxygen in a lake? A. lower temperatures B. fertilizer runoff C. overfishing