Unit 1 MCQ

Which feature of model 1 best illustrates how biological information is coded in a DNA molecule?

The linear sequence of base pairs

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

As water exits, H bonding between water molecules are affected by cohesion

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

Which of the following models best demonstrates the arrangement of hydrogen bonds between adjacent water molecules?

H is attracted to O

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

monomers to macromolecules

covalent bonding, water molecule is produced

Which of the following best describes the process that adds a monosaccharide to an existing polysaccharide?

dehydration synthesis

which statement best describes the observed relationship between atmospheric CO2 enrichment and plant growth under ideal and stressed conditions?

greater increase in plant growth under stressed rather than under ideal conditions

which of the following best compares the atomic structures of starch and cellulose?

in cellulose every other glucose monomer is rotated 180 degrees

Which of the following is the most likely reason for the difference in leaf growth between the phosphate and phosphate-starved plant?

it was unable to synthesize nucleic acids and lipids

changing an amino acid sequence will cause the resulting protein to

not function properly in the cell

why do starch and cellulose provide different functions in plants?

organization of the monomers of these two polymers are different

name a key difference among the 20 amino acids that are used to make proteins

some are hydrophobic

how does the structure of ice help fish that live below it?

the molecules in ice are more spread apart than those in water