Chemicals that allow nerve impulses to transmit between neurons are called

a. axon terminals.

b. neurotransmittors.

c. vesicles.

d. synapse.

Select the true statements about secondary structure A) In a β-pleated sheet, the side chains extend above and below the sheet B) In an α-helix, the side chains are located inside the helix C) The α-helix is held together by hydrogen bonds between

Which statement best describes the role of DNA in relation to RNA and proteins? A. DNA is made from RNA, which is created from proteins. B. Proteins are made from RNA, which is created from DNA. C.

A difference between bacteria and archaea is

Which parasitic protozoan needs two hosts for its propogation? Entamoeba Giardia Plasmodium

The reciprocal class of double-crossover phenotypes represents the greatest proportion of the f2 offspring. the reciprocal class of double-crossover phenotypes represents the greatest proportion of the f2 offspring. a. True b. False

Give four reasons why organic material is good for the soil.

What is true about psychosocial changes observed in adolescents? select all that apply?

This causes substances to move across the cell membrane, against the concentration gradient. Select one: a. active transport b. neutral transport c. passive transport d. hydrophobic transport

1. The nerve impulse is an electrical current that travels along dendrites or axons. True or false

What led to the conclusion that single-celled prokaryotic organisms evolved in the absence of oxygen