Which of the following molecules is the subunit of DNA that links together to form strands of DNA?

A.

a phosphate base

B.

a polymerase

C.

a codon

D.

a nucleotide

Several hours after eating a chilled three-bean salad containing home-canned green beans, family members have difficulty breathing and swallowing, double vision, and muscle weakness. what should they do

What do scientists call information collected from observation?

Which two systems provides the molecules needed for the metabolic activity that takes place at ribosomes?

What happens once the body is exposed to a pathogen?

Severe edema in pregnant women may be a symptom of what health condition?

Which of the following is NOT a correct match? Select one: a. Marius: first to allow landless citizens to become soldiers b. Sulla: first general to seize Rome and name himself dictator without time limit c. Pompey: member of the First Triumvirate d.

Organisms are classified as producers or consumers according to the way they

Recent research into the biological roots of homosexuality has focused on

Which of the following is a result of burning fossil fuels for energy? A. acid rain B. all of the above C. increased carbon dioxide levels in the atmosphere D. production of electricity

What is trophic cascade as mentioned in this video titled "How Wolves Change Rivers?" A• how the rivers flow throughout Yellowstone National Park.