1- proteins in biological systems ?_.
A) link with other proteins to form bilayers in cell membranes
B) store genetic information
C) form high—energy intermediates such as ATP
D) catalyze reactions
4) Under what circumstances does membrane tr ansport require energy?
A) whenever an ion moves through a phospholipid bilayer membrane
B) whenever a solute is moved a against concentration gradient
C) wherever large molecules arermoved within a cell
D) whenever oxygen moves through a phospholipid bilayer membrane
5) Cells are
a)are defined by their cell wall
B) characteristic of eukaryotic but not prokaryotic organisms , .
C) characteristic of prokaryotic and eukaryotic organisms C “1
D) only found in pairs, because single cells cannot exist independently
6) for a protein to be an integral transmembrane protein, it would have to be
A) amphipathic, with at least one hydrophobic region
B) completely covered with phospholipids
C)exposed on only one surface of the membrane
D) hydrophobic
E) hydrophilic
7) Which level of protein structure do the or-helix and the [3-pleated sheet represent?
A) primary
B) secondary
C) tertiary
D) quaternarv primary, secondary, tertiary, and quaternary
8) which of the following categories includes all others in the list?
A) polysaccharide
B)starch
C) monosaccharide
D) disaccharide
E) carbohydrate
9) In a normal cellular protein, where would you expect to find a hydrophobic amino acid like valine?
A) in the interior of the folded protein, away from water, or in a transmembrane portion interacting with lipid fatty acid chains
b) anywhere in the protein, with equal probability
C) on the exterior surface of the protein, interacting with water
D) in the transmembrane portion interacting with lipid fatty acid chains
E) in the interior of the folded protein, away from water
12) which of the following descriptions best fits the class of molecules known as nucleotides?
A) a nitrogenous base, a phosphate group, and a sugar
B) a nitrogenous base and a phosphate group
c)nitrogenous base and a sugar
D) a sugar and a purine or pyrimidine
E) a phosphate group and an adenine or uracil
13) covalent bond is likely to be polar when _____.
’ A) the two atoms sharing electrons are equally electronegative
B) carbon is one of the two atoms sharing electrons
c) the two atoms sharing electrons are the same elements
D) one of the atoms has absorbed more energy than the other atom
E) one of the atoms sharing electrons is more electronegative than the other atom
15)’The difference between the sugar in DNA and the sugar in RNA is that the sugar in DNA .
A) is an aldehyde sugar and the sugar in RNA is a keto sugar
B) is a six-carbon sugar and the sugar in RNA is a five-carbon sugar
C) can form a double-stranded molecule
D) contains one less oxygen atom
c) is in the or configuration and the sugar in RNA is in the B configuration
18)wich of the following is not related to the fundamental characteristics of life?
’ A) A bacterial cell divides to produce two cells
B) Giraffes have longer necks so that they can reach food sources unavailable to other animals
c) Sugars are broken down inside cells to produce energy
D) A growing plant will bend towards a light source
E) The gene that specifies skin color in frogs is expressed during its development from a tad pole into an
adult frog
20J) Suppose a cell has the following molecules and structures: enzymes, DNA, ribosomes, plasma membrane, and mitochondria. It could be a cell from ____.
a) a plant but not an animal
B) nearly any eukaryotic organism
C) an animal but not a plant
D) any kind of prokaryotic organism
E) a bacterium
21) Which of the following best describes the logic of scientific inquiry?
a) If my experiments are set up right, they will lead to a testable hypothesis.
B) If my prediction is correct, it will lead to a testable hypothesis.
C) If I generate a testable hypothesis, tests and observations will support it.
D) If my hypothesis is correct, I can predict certain test results.
E) If my observations are accurate, they will support my hypothesis.
23) The molecule shown in the accompanying figure is g.
a) DNA monomer
b) an mino acid
C) a sugar
D) a protein
E) a phosphate
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