4. how does a cell membrane retain its shape?
a. the forces of polar molecules pushing on one another
b. the force of water molecules pushing on the lipids of the bilayer
c. the attractive forces of the lipid tails
d. the repellant forces between the heads and tails of the bilayer
5. what molecules are embedded within a cell membrane that allow needed materials to pass through?
a. dna
b. rna
c. proteins
d. carbohydrates

If a set of instructions that determines all of the charactersitics of an organism is comparedto a book,and a chromosme is compared to chaper in the book,then what might be compared to a paragraph in the book?

Protein synthesis actually begins in the nucleus when transcribes a single gene on the dna molecule is copied. the process of copying this gene is called this copy is known as and contains the protein building instructions. this copy is sent out into the cytoplasm to the part of the cell known as the the of the ribosome will join together to form a functional ribosome when they attach to the mrna. as the mrna moves through the ribosome, the message is read by transfer rna brings the correct back to the ribosome. the amino acids are placed in the correct order and are hitched together by

Which statement about the immune system is false? a. lymphocytes reduce inflammation, b. b cells remember specific pathogens. c. most white blood cells kill bacteria d. white blood cells are made in lymph nodes.