Which term describes the difference in the concentrations of a substance across a cell's membrane?

concentration gradient

molecular concentration

diffusion membrane

concentration membrane

In a large population, the allele frequency of A was. 5 and changed to. 7 over just a few generations. Which of the following statements about this example is FALSE? 1. Evolution is occurring in the population. 2.

What substance is a nucleic acid

Some protozoans have special organelles called contractile vacuoles that continually eliminate excess water from the cell. The presence of these organelles tells you that the environment is what to the protozoan?

What can track storms in different altitudes?

Which of these sentences is true about nitrogen

How many pairs of autosomes does this karyotype have?

If a theory is challenged by new evidence, which of the following couod occur? A. the theory could be altered B. the theory is accepted, not the evidence C. the evidence is wrong D. a vote is taken to accept new evidence

Explain why different surfaces have different albedos.

Ab blood type is the universal blood recipient because of that type's lack of agglutinogens. ab blood type is the universal blood recipient because of that type's lack of agglutinogens. a. True b. False

Insulin preparations are divided into categories based on onset, duration, and intensity of action following subcutaneous inject. Which of the following insulin preparations has the shortest onset and duration of action? A. Insulin lispro B.