Osmosis occurs as water can cross the lipid bilayer through specialized channels for water movement called question 20 options: proteins transmembrane carbohydrates membrane pores aquaporins

Which image shows labeled organelles that are present only in plant cells?

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.

Water diffusing through a semipermeable membrane is called