The two strands of a DNA double helix are held together by:

A. ionic bonds.

B. hydrogen bonds.

C. nonpolar covalent bonds.

D. polar covalent bonds.

E. hydrophobic exclusions.

In which kind of solution is concentration of solutes the same inside and outside of the cell?

What's the difference in prokaryotic and eukaryotic cells in its chromosomes and nucleus?

Which type of neuron carries impulses from sense organs to the spinal cord or brain?

What are the results of having dilated arteries during exercise?

What process directly responsible for root growth in plants

Barbara has been healthy up to the past couple of weeks, but since then has been complaining of considerable muscle weakness. Her doctor just received the results of blood tests, which showed that she is deficient in potassium.

A gene is to a chromosome as a. A pea is to a pod b. A front word is to a back c. A bike is to a car d. A building is to a window

Identify two reasons why the energy values are different between the primary and secondary consumer?

You have isolated a gram-positive bacterium with low g + c content. It was a contaminant in unpasteurized milk. It infected a pregnant woman, and now you are worried that her child will be stillborn. What bacterium is it?

Discuss why teenagers' understanding of death is not yet fully mature.