Ap bio unit 1

Which statement describes how water is pulled up through the xylem to the leaves of the plant?

As water exits the leaf, hydrogen bonding between water molecules pulls more water up from below by cohesion

Which of the following best describes a structural similarity between the two molecules that is relevant to their function?

Both molecules contain nucleotides that form base pairs with other nucleotides, which allows each molecule to act as a template in the synthesis of the other nucleic acid molecules.

Which of the following would most likely occur if cattle lost the ability to maintain a colony of microorganisms in their digestive tract?

Cattle would no longer be able to use cellulose as a primary source of glucose.

DNA double helix. Of the following possible changes, which would be most effective in making model 1 look more like RNA than DNA?

Changing the deoxyriboses to riboses by adding −OH groups

Which of the following is a common feature of the illustrated reactions showing the linking of monomers to form macromolecules?

Monomers are joined by a covalent bond and a water molecule is produced

Which of the following describes a key difference among the 20 amino acids that are used to make proteins?

Some amino acids are hydrophobic

An amino acid must have which of the following properties in order to be incorporated into a polypeptide?

The ability to form a covalent bond with both its NH2 group and its COOH group

Based the information provided, which of the following statements best describes why starch and cellulose provide different functions in plants?

The differences in the assembly and organization of the monomers of these two polymers result in different chemical properties.

Which is the most likely for the difference in leaf growth?

The phosphorus-starved plant was unable to synthesize both the required nucleic acids and lipids, limiting growth.

Which of the following best describes how the structure of ice benefits the organisms that live in the water below?

The water molecules in ice are farther apart than those in liquid water, so the ice floats, maintaining the warmer, denser water at the lake bottom.

How might this change affect the structure and function of the protein?

The r-group of the new amino acid, valine, has different chemical properties than the r-group of cysteine. This will cause the protein to misfold and not function properly in the cell.