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.

Darwin's The Descent of Man differed from On the Origin of Species in that: a. It was based on close observation of one particular species of tortoise. b. It was less well-written and received poorly by the reading public. c.

Consider a fish, rabbit, gorilla, and human. Which two organisms would most likely have the closet homology with respect to their DNAs?

Density of ocean water

Is there a primary standard setting body accounting?

What is the difference between the chromosomes in a secondary spermatocyte and those in a spermatid. A) The chromosomes in secondary spermatocytes consist of two chromatids; the ones in the spermatid consist of only one chromatid.

Name the function segment of DNA

Among the major atmospheric contaminants which is the only one that is increasing? what is the significance of this contaminant?

Difference btw acquired and inherited triat

What do organisms in Kingdom Eubacteria have in common? A.) They live in less extreme environments than most archaebacteria. B.) They live in the hottest and coldest places on Earth. C.) They are multicellular. D.) They live without oxygen.

A scientist was studying a population of elephants. The first year, he counted a population of 80. Over the next eight years, the population's numbers were 94, 100, 103, 110, 125, 120, 125, 120. The population never exceeded 125.