Which of the following best describes the structure of the cell membrane?

A. A stiff structure made of complex sugars

B. A long chain of amino acids

C. A jelly-like substance

D. A double layer of phospholipids with proteins

A cell lining the inside of the stomach is producing some digestive enzymes that are to be released into the stomach.

What is the main function of any organism's reproductive system? A) to remove wastes from the body B) to process food and turn it into energy C) to distribute oxygen throughout the body D) to create new individuals within the species

What is meant by crossing over?

Transports materials within the cell

blooms in ponds are caused by___. a. archeabacteria b. cyanobacteria c. cocci d. viruses

What do cells need to do between divisions to make sure that a full set of dna gets passed on to each daughter cell?

True or false: The central nervous system allows us to sense the environment

Which of the following statements is false regarding root hairs? a. they are outgrowths of endodermal cells c. they increase the surface area of the root b. they are outgrowths of epidermal cells d. they absorb water and nutrients

Why is it critical to divide the chromosome number in half?

The amino acid proline is one of the three amino acids that watson describes as having "special properties". what is special about proline?