What is an example of "facilitated diffusion"? PLEASE HELP QUICK!! A. a special transport protein speeds up the movement of glucose into a cell

B. oxygen diffuses across a cell membrane

C. a drop of food coloring spreads out in water

D. water moves out of a wilted plant

What links the two strands in a dna helix together in the middle? a. phosphate groups b. sugar rings bonded together c. proteins d. bases with hydrogen bonds

Asap many people try to eliminate fat from their diets which is one reason it is necessary for humans to eat fat a) fat is the only way to get energy b) every cell in the body must contain fat c)fat stores less energy than polysaccharides d) saturated fats make blood vessels healthier

Which kind of mutation has occurred when the codon for an amino acid is changed to a stop codon? a. a silent mutation b. a missense mutation c. a frameshift mutation d. a nonsense mutation