Cell Biology

Because membranes usually are not permeable to polysaccharides, nucleic acids, and proteins, how are

Because membranes usually are not permeable to polysaccharides, nucleic acids, and proteins, how are

Because membranes usually are not permeable to polysaccharides, nucleic acids, and proteins, how are cells able to incorporate these molecules?
A) These macromolecules are only incorporated into structures outside the membrane.
B) Macromole

Astatine   267   3 Replies

Lilligant

Which of the following is true of an asymmetric carbon atom?

Which of the following is true of an asymmetric carbon atom?

Which of the following is true of an asymmetric carbon atom?
A) Only amino acids have asymmetric carbon atoms.
B) A carbon with hydrogens attached at two locations is usually asymmetric.
C) Methane has an asymmetric carbon.
D) Asy

Astatine   497   3 Replies

Lilligant

The moon lacks life and varies dramatically in temperature. If we could keep a layer of water spread

The moon lacks life and varies dramatically in temperature. If we could keep a layer of water spread

The moon lacks life and varies dramatically in temperature. If we could keep a layer of water spread on the surface of the moon, what effect would it have?
A) Physical conditions would remain the same.
B) Because water has a high heat of va

Astatine   359   3 Replies

Lilligant

Which of the following is a unit of energy?

Which of the following is a unit of energy?

Which of the following is a unit of energy?
A) calorie
B) joule
C) watt
D) mole
E) both choices A and B

Astatine   136   3 Replies

Lilligant

Biologically, which of the following is the least important characteristic of water?

Biologically, which of the following is the least important characteristic of water?

Biologically, which of the following is the least important characteristic of water?
A) Water molecules are polar.
B) Water molecules have numerous hydrogen bonds.
C) Water is a good solvent.
D) Water typically contains isotopes o

Astatine   421   3 Replies

Lilligant

In the lab, you choose to design a simple experiment to distinguish between hydrophilic and hydropho

In the lab, you choose to design a simple experiment to distinguish between hydrophilic and hydropho

In the lab, you choose to design a simple experiment to distinguish between hydrophilic and hydrophobic substances. You start by adding equal amounts of vinegar and oil to a container. After shaking, the vinegar and oil levels separate, based upon po

Astatine   488   3 Replies

Lilligant

The term amphipathic refers to those molecules that are

The term amphipathic refers to those molecules that are

The term amphipathic refers to those molecules that are
A) hydrophilic.
B) hydrophobic.
C) charged at both ends but with opposite charges.
D) nonpolar at both ends.
E) charged at one end and nonpolar at the other.

Astatine   538   3 Replies

Lilligant

While synthesizing a new blue pigment, a chemist notices that the new compound congregates between a

While synthesizing a new blue pigment, a chemist notices that the new compound congregates between a

While synthesizing a new blue pigment, a chemist notices that the new compound congregates between an aqueous (water) environment and a hydrophobic environment. When added to a mixture of oil and water, the pigment creates a blue ring around the drop

Astatine   813   3 Replies

Lilligant

Which of the following is not a possible noncovalent interaction?

Which of the following is not a possible noncovalent interaction?

Which of the following is not a possible noncovalent interaction?
A) hydrogen bonding
B) ionic bonding
C) van der Waals interactions
D) hydrophobic interactions
E) polar covalent bonding

Astatine   445   3 Replies

Lilligant

Detergents are best able to dissolve oil from fabric or dishes during washing because

Detergents are best able to dissolve oil from fabric or dishes during washing because

Detergents are best able to dissolve oil from fabric or dishes during washing because
A) the positively charged end is associated with a sphere of hydration, while the negatively charged end interacts with the oil droplet.
B) the negatively

Astatine   963   3 Replies

Lilligant

Which of the following is not true of hydrocarbons?

Which of the following is not true of hydrocarbons?

Which of the following is not true of hydrocarbons?
A) Octane is a hydrocarbon.
B) Hydrocarbons are insoluble in water.
C) Many hydrocarbons are used in living systems.
D) Only hydrogen atoms are used to complete the valence requi

Astatine   758   3 Replies

Lilligant

Which one of the following biological polymers is mismatched with its monomer?

Which one of the following biological polymers is mismatched with its monomer?

Which one of the following biological polymers is mismatched with its monomer?
A) DNA - nucleotide
B) enzyme - amino acid
C) chitin - monosaccharide
D) protein - amino acid
E) cellulose - amino acid

Astatine   594   3 Replies

Lilligant

Which of the following is not an activated monomer?

Which of the following is not an activated monomer?

Which of the following is not an activated monomer?
A) adenosine triphosphate
B) glucose-6-phosphate
C) aminoacyl tRNA
D) amino acid
E) uracil triphosphate

Astatine   613   3 Replies

Lilligant

Which of the following was not considered part of the "alphabet of biochemistry" by George Wald?

Which of the following was not considered part of the "alphabet of biochemistry" by George Wald?

Which of the following was not considered part of the "alphabet of biochemistry" by George Wald?
A) the 20 amino acids
B) the 5 nucleotide bases
C) two sugars
D) three lipids
E) seven proteins

Astatine   940   3 Replies

Lilligant

An enzyme synthesized in the laboratory is found to have little activity when compared to the enzyme

An enzyme synthesized in the laboratory is found to have little activity when compared to the enzyme

An enzyme synthesized in the laboratory is found to have little activity when compared to the enzyme extracted from cell culture. Both enzymes were examined and have identical amino acid composition. What is the best explanation for the lack of activ

Astatine   934   3 Replies

Lilligant

Which of the following statements about the polymerization of macromolecules is false?

Which of the following statements about the polymerization of macromolecules is false?

Which of the following statements about the polymerization of macromolecules is false?
A) Often the energy needed for polymerization is supplied by ATP.
B) The polymer chain usually has two different ends.
C) Water is added to join the

Astatine   633   3 Replies

Lilligant

Which of the following is not a structural polysaccharide?

Which of the following is not a structural polysaccharide?

Which of the following is not a structural polysaccharide?
A) glycogen
B) peptidoglycan
C) cellulose
D) chitin
E) All of the above are structural polysaccharides.

Astatine   364   3 Replies

Lilligant

The polymerization of different types of macromolecules is similar in many respects. Which of the fo

The polymerization of different types of macromolecules is similar in many respects. Which of the fo

The polymerization of different types of macromolecules is similar in many respects. Which of the following principles below is least likely to be common to all methods of polymerization of macromolecules?
A) To be added to the polymer, the mono

Astatine   398   3 Replies

Lilligant

Which of the following is not soluble in water?

Which of the following is not soluble in water?

Which of the following is not soluble in water?
A) lipids
B) sugars
C) amino acids
D) disaccharides
E) nucleic acids

Astatine   148   3 Replies

Lilligant

A hypothetical automobile has 100 parts that are to be assembled by four workers. During the car's a

A hypothetical automobile has 100 parts that are to be assembled by four workers. During the car's a

A hypothetical automobile has 100 parts that are to be assembled by four workers. During the car's assembly, each worker constructs 25 parts individually, and then the four resulting components are assembled together. The manner in which the car

Astatine   505   3 Replies

Lilligant

Heat shock proteins are (Multiple Choice Question)

Heat shock proteins are (Multiple Choice Question)

Heat shock proteins are
A) only actively synthesized during conditions of intense heat.
B) only observed in prokaryotic cells.
C) molecular chaperones synthesized during times of cellular stress.
D) unique to every organism.

Astatine   301   3 Replies

Lilligant

Self-assembly is limited by (Multiple Choice Question)

Self-assembly is limited by (Multiple Choice Question)

Self-assembly is limited by
A) the size of the molecule.
B) the presence of water in the cytosol.
C) information of preexisting structures.
D) the time associated with forming solely noncovalent interactions.
E) all of the ab

Astatine   370   3 Replies

Lilligant

All of the following are common functional groups found in biological molecules except

All of the following are common functional groups found in biological molecules except

All of the following are common functional groups found in biological molecules except
A) phosphate groups.
B) carbonyl groups.
C) amino groups.
D) sulfhydryl groups.
E) butyl groups.

Astatine   429   3 Replies

Lilligant

Which of the following is an informational macromolecule?

Which of the following is an informational macromolecule?

Which of the following is an informational macromolecule?
A) DNA
B) ATP
C) starch
D) glycogen
E) polypeptide

Astatine   462   3 Replies

Lilligant

Monomers are removed from polymers by ________ reactions.

Monomers are removed from polymers by ________ reactions.

Monomers are removed from polymers by ________ reactions.
A) condensation
B) hydrolysis
C) neutralization
D) substitution
E) redox

Astatine   2725   3 Replies

Lilligant

To which of the following classes of sugars does glucose belong?

To which of the following classes of sugars does glucose belong?

To which of the following classes of sugars does glucose belong?
A) pentose
B) hexose
C) tetrose
D) heptose
E) triose

Astatine   632   3 Replies

Lilligant

Disulfide bonds are often found to stabilize which of the following levels of protein structure?

Disulfide bonds are often found to stabilize which of the following levels of protein structure?

Disulfide bonds are often found to stabilize which of the following levels of protein structure?
A) primary
B) secondary
C) tertiary
D) all of the above
E) none of the above

Astatine   567   3 Replies

Lilligant

The primary structure of a protein

The primary structure of a protein

The primary structure of a protein
A) is important for determining the secondary and tertiary structure of a protein.
B) is simply the order of amino acids from one end of the protein to another.
C) is important both genetically and st

Astatine   189   3 Replies

Lilligant

Which of the following is not a characteristic of DNA?

Which of the following is not a characteristic of DNA?

Which of the following is not a characteristic of DNA?
A) complementarity
B) composed of nucleotides
C) contains ribose
D) antiparallel strands
E) double-stranded

Astatine   127   3 Replies

Lilligant

Which of the following is true of transfer RNA?

Which of the following is true of transfer RNA?

Which of the following is true of transfer RNA?
A) It serves as the site of protein synthesis.
B) It is an important component of ribosomes.
C) It is responsible for the correct positioning of amino acids in a polypeptide.
D) It f

Astatine   266   3 Replies

Lilligant

Which of the following is not true of phospholipids?

Which of the following is not true of phospholipids?

Which of the following is not true of phospholipids?
A) Phospholipids are important in membrane structure.
B) Serine is a molecule that may be part of a phosphoglyceride.
C) Phosphatidic acid contains two fatty acids and a phosphate gr

Astatine   891   4 Replies

Lilligant

The term amphipathic describes the characteristic of some molecules that have ________.

The term amphipathic describes the characteristic of some molecules that have ________.

The term amphipathic describes the characteristic of some molecules that have ________.
A) two polar regions
B) only a single polar region
C) both a polar and a nonpolar region
D) no polar regions
E) two nonpolar regions

Astatine   596   3 Replies

Lilligant

Which of the following is true of fatty acids?

Which of the following is true of fatty acids?

Which of the following is true of fatty acids?
A) Fatty acids are synthesized by the stepwise addition of three carbon units.
B) Unsaturated fatty acids are usually branched.
C) Fatty acids with 24 carbons are most common.
D) Satu

Astatine   233   3 Replies

Lilligant

The active site for carboxypeptidase

The active site for carboxypeptidase

The active site for carboxypeptidase
A) contains amino acids that are contiguous to one another along the primary sequence of the protein.
B) uses iron as the prosthetic group.
C) involves only 6 out of a total of 307 amino acids.

Astatine   541   4 Replies

Lilligant

Which of the following is a terpene?

Which of the following is a terpene?

Which of the following is a terpene?
A) testosterone
B) vitamin A
C) glycerol
D) phenanthrene
E) dolichol

Astatine   300   3 Replies

Lilligant

Which of the following molecules would not readily cross an intact cell membrane by simple diffusion

Which of the following molecules would not readily cross an intact cell membrane by simple diffusion

Which of the following molecules would not readily cross an intact cell membrane by simple diffusion?
A) water
B) glucose
C) oxygen
D) fatty acids
E) ethanol

Astatine   983   3 Replies

Lilligant

Two cells with different cell-surface markers are fused in the presence of polyethylene glycol (PEG)

Two cells with different cell-surface markers are fused in the presence of polyethylene glycol (PEG)

Two cells with different cell-surface markers are fused in the presence of polyethylene glycol (PEG). The cells are then placed at 0°C. What do you expect to observe about the individual cell markers?
A) The markers will evenly disperse througho

Astatine   290   3 Replies

Lilligant

Inactivation of a fluorescent dye in a very concentrated spot on a cell so that the fluidity of memb

Inactivation of a fluorescent dye in a very concentrated spot on a cell so that the fluidity of memb

Inactivation of a fluorescent dye in a very concentrated spot on a cell so that the fluidity of membranes can be visualized is called
A) liposome formation.
B) SDS-PAGE.
C) photobleaching.
D) the freeze-fracture technique.
E)

Astatine   207   3 Replies

Lilligant

Cholesterol (Multiple Choice Question)

Cholesterol (Multiple Choice Question)

Cholesterol
A) is found in abundance in prokaryotic cell membranes.
B) intercalates between the fatty acid chains within the bilayer.
C) increases permeability for small cations.
D) destabilizes the cell membrane.
E) is found

Astatine   171   3 Replies

Lilligant

A prokaryotic organism is isolated from a hydrothermal vent, where it has been observed to be thrivi

A prokaryotic organism is isolated from a hydrothermal vent, where it has been observed to be thrivi

A prokaryotic organism is isolated from a hydrothermal vent, where it has been observed to be thriving. Based on your knowledge of the plasma membrane, you would expect to find a predominance of
A) largely saturated fatty acids.
B) equal am

Astatine   320   3 Replies

Lilligant