Each red blood cell contains about 250 million hemoglobin molecules and so can carry at least one billion molecules of oxygen.

a. true

b. false

Which is a correct way to paraphrase the following: 1. A constant stream of energy is needed to maintain the organized array of biochemicals that sustain life. 2.

Today we face with an increase in carbon dioxide in our atmosphere. Imagine however that the reverse were true. Imagine if there were a decrease in carbon dioxide in an increase in oxygen.

Generalizations, explanations of natural phenomena, and additional hypotheses most often come about as a result of

4. Once a stimulus generates an action potential in the sensory neuron associated with the receptor, how does the brain know that the stimulus is extremely painful in the left foot?

If you look for RNA n various parts of the cell where would it be found

Which sources do scientists use to reconstruct past climate conditions? Check all that apply. fossils frozen in glaciers daily temperatures pollen grains preserved in sediment running water tree rings

In beetles, the gene for color and the gene for pattern are located on the same chromosome and exhibit recombination.

Nucleic acids are composed of monomers called?

Cyclic amp (camp) stimulates one's metabolic rate. many supplement companies offer products claiming to increase the levels of this chemical within the body.

Injecting a person with a killed-bacteria vaccine can protect that individual from a disease because the proteins of the bacteria: A) remain in the body and live bacteria later prey on them instead of live tissue B) blind with receptors in the body,