The twisted shape of DNA is called a.

a. double ladder

b. double helix

c. nucleotide

d. base pair

What is a nucleotide? a. a set of three bases in a mRNA molecule b. a set of three bases in a tRNA molecule c. a sugar and a base and a phosphate d. a sugar and a lipid and a phosphate e. a base and a sugar

Recording from single neurons in the brain has shown that neurons responding to specific types of stimuli are often clustered in specific areas. these results support the idea of:

Which of the following may be members of the kingdom Archaea?

Which scientist concluded that all animals are made of cells

What protects the lining of the stomach

Hich equation shows a disaccharide with the monosaccharides that make it up?

Which of these vessels returns blood to the left atrium of the heart? A) pulmonary veins B) coronary sinus C) superior vena cava D) pulmonary trunk

Prokaryotes replicate and form two identical daughter cells using a process called

Because digital signals do not depend on amplitude or frequency differences to communicate information, they are more vulnerable to emi noise.

What are some characteristics of nervous tissue?