Advertisement Upgrade to remove ads

Which of the following hydrocarbons has a triple bond in its carbon skeleton?

A) C2H6
B) C3H8
C) CH4
D) C2H4
E) C2H2

E) C2H2

Amino acids are acids because they always possess which functional group?

A) amino
B) phosphate
C) carbonyl
D) hydroxyl
E) carboxyl

E) carboxyl

When Stanley Miller applied heat and electrical sparks to a mixture of simple inorganic compounds such as methane, hydrogen gas, ammonia, and water vapor, organic compounds were produced. What was the significance of this experiment?

A) It demonstrated that life arose from the ancient atmospheric chemicals.
B) It demonstated that life began when such an event occurred in the ancient world.
C) It conclusively proved that the ancient atmosphere contained methane, ammonia, oxygen, ozone and water.
D) It demonstrated that conditions on the ancient earth may have allowed biological molecules to be made.
E) It demonstrated that only simple inorganic compounds were present in the ancient world.

D) It demonstrated that conditions on the ancient earth may have allowed biological molecules to be made.

How many structural isomers are possible for a substance having the molecular formula C4H10?

A) 4
B) 3
C) 11
D) 1
E) 2

E) 2

Which of the following statements best describes the carbon atoms present in a seed-eating bird?

A) Inorganic carbon atoms in the seeds were incorporated into organic molecules by the bird.
B) The carbon atoms ultimately came from carbon dioxide incorporated into sugars through photosynthesis.
C) The carbon atoms ultimately came from the soil.
D) The carbon atoms ultimately came from simple organic compounds that formed abiotically (not from a living organism) from inorganic carbon, hydrogen, oxygen, and nitrogen atoms.
E) The carbon atoms are ultimately derived from coal.

B) The carbon atoms ultimately came from carbon dioxide incorporated into sugars through photosynthesis.

What determines whether a carbon atom's covalent bonds to other atoms are in a tetrahedral configuration or a planar configuration?

A) the solvent that the organic molecule is dissolved in
B) the presence or absence of bonds with oxygen atoms
C) the polarity of the covalent bonds between carbon and other atoms
D) the presence or absence of bonds with nitrogen atoms
E) the presence or absence of double bonds between the carbon atom and other atoms

E) the presence or absence of double bonds between the carbon atom and other atoms

Which of the following is not a polymer?

A) glucose
B) starch
C) chitin
D) DNA
E) cellulose

A) glucose

How many molecules of water are needed to completely hydrolyze a polymer that is 11 monomers long?

A) 11
B) 12
C) 10
D) 9
E) 8

C) 10

A molecule with the formula C18H36O2 is probably a

A) hydrocarbon.
B) carbohydrate.
C) protein.
D) nucleic acid.
E) fatty acid.

E) fatty acid.

What is the chemical reaction mechanism by which cells make polymers from monomers?

A) dehydration reactions
B) the formation of disulfide bridges between monomers
C) hydrolysis
D) ionic bonding of monomers
E) phosphodiester linkages

A) dehydration reactions

The molecular formula for glucose is C6H12O6. What would be the molecular formula for a molecule made by linking three glucose molecules together by dehydration reactions?

A) C18H32O16
B) C18H36O18
C) C3H6O3
D) C18H10O15
E) C6H10O5

A) C18H32O16

Polysaccharides, triacylglycerides, and proteins are similar in that they:

A) all contain nitrogen in their monomer building blocks.
B) are synthesized from monomers by the process of hydrolysis.
C) are decomposed into their subunits by dehydration reactions.
D) are synthesized as a result of peptide bond formation between monomers.
E) are synthesized from subunits by dehydration reactions.

E) are synthesized from subunits by dehydration reactions.

On food packages, to what does the term insoluble (dietery) fiber refer?

A) cellulose
B) starch
C) polypeptides
D) chitin
E) amylopectin

A) cellulose

There are 20 different amino acids. What makes one amino acid different from another?

A) different asymmetric carbons
B) different side chains (R groups) attached to the amino groups
C) different side chains (R groups) attached to an α carbon
D) different structural and optical isomers
E) different side chains (R groups) attached to a carboxyl carbon

C) different side chains (R groups) attached to an α carbon

The bonding of two amino acid molecules to form a larger molecule requires

A) the release of a carbon dioxide molecule.
B) the release of a water molecule.
C) the addition of a nitrogen atom.
D) the addition of a water molecule.
E) the release of a nitrous oxide molecule.

B) the release of a water molecule.

What aspects of protein structure are stabilized or assisted by hydrogen bonds?

A) tertiary structure
B) secondary structure
C) primary structure
D) secondary, tertiary, and quaternary structures, but not primary structure
E) quaternary structure

D) secondary, tertiary, and quaternary structures, but not primary structure

The R group or side chain of the amino acid serine is -CH2-OH. The R group or side chain of the amino acid leucine is -CH2-CH-(CH3)2. Where would you expect to find these amino acids in a globular protein in aqueous solution?

A) Both serine and leucine would be in the interior and on the exterior of the globular protein.
B) Serine would be in the interior, and leucine would be on the exterior of the globular protein.
C) Both serine and leucine would be on the exterior of the globular protein.
D) Leucine would be in the interior, and serine would be on the exterior of the globular protein.
E) Both serine and leucine would be in the interior of the globular protein.

D) Leucine would be in the interior, and serine would be on the exterior of the globular protein.

What type of covalent bond between amino acid side chains (R groups) functions in maintaining a polypeptide's specific three-dimensional shape?

A) disulfide bond
B) hydrophobic interaction
C) ionic bond
D) van der Waals interaction
E) hydrogen bond

A) disulfide bond

At which bond would water need to be added to achieve hydrolysis of the peptide, back to its component amino acid?

A) A
B) B
C) C
D) D
E) E

C) C

When biologists wish to study the internal ultrastructure of cells, they can achieve the finest resolution by using

A) a scanning electron microscope.
B) a phase-contrast light microscope.
C) a confocal fluorescence microscope.
D) a super-resolution fluorescence microscope.
E) a transmission electronic microscope.

E) a transmission electronic microscope.

Which of the following correctly lists the order in which cellular components will be found in the pellet when homogenized cells are treated with increasingly rapid spins in a centrifuge?

A) ribosomes, nucleus, mitochondria
B) chloroplasts, ribosomes, vacuoles
C) nucleus, ribosomes, chloroplasts
D) nucleus, mitochondria, ribosomes
E) vacuoles, ribosomes, nucleus

D) nucleus, mitochondria, ribosomes

A primary objective of cell fractionation is to

A) separate the major organelles so that their particular functions can be determined.
B) separate lipid-soluble from water-soluble molecules.
C) sort cells based on their size and weight.
D) view the structure of cell membranes.
E) determine the size of various organelles.

A) separate the major organelles so that their particular functions can be determined.

All of the following are part of a prokaryotic cell except

A) ribosomes.
B) DNA.
C) a cell wall.
D) a plasma membrane.
E) an endoplasmic reticulum.

E) an endoplasmic reticulum.

The evolution of eukaryotic cells most likely involved

A) acquisition of an endomembrane system, and subsequent evolution of mitochondria from a portion of the Golgi.
B) endosymbiosis of an aerobic bacterium in a larger host cell-the endosymbiont evolved into mitochondria.
C) an endosymbiotic fungal cell evolved into the nucleus.
D) anaerobic archaea taking up residence inside a larger bacterial host cell to escape toxic oxygen-the anaerobic bacterium evolved into chloroplasts.
E) the splitting of the original progenitor cell into the cell and its mitochondria

B) endosymbiosis of an aerobic bacterium in a larger host cell-the endosymbiont evolved into mitochondria.

Which structure-function pair is mismatched?

A) nucleolus; production of ribosomal subunits
B) lysosome; intracellular digestion
C) Golgi; protein trafficking
D) microtubule; muscle contraction
E) ribosome; protein synthesis

D) microtubule; muscle contraction

If radioactive deoxythymidine triphosphate (dTTP) is added to a culture of rapidly growing bacterial cells, where in the cell would you expect to find the greatest concentration of radioactivity?

A) nucleus
B) endoplasmic reticulum
C) cytoplasm
D) ribosomes
E) nucleoid

E) nucleoid

A biologist ground up some plant leaf cells and then centrifuged the mixture to fractionate the organelles. Organelles in one of the heavier fractions could produce ATP in the light, whereas organelles in the lighter fraction could produce ATP in the dark. The heavier and lighter fractions are most likely to contain, respectively,

A) mitochondria and peroxisomes.
B) mitochondria and chloroplasts.
C) peroxisomes and chloroplasts.
D) chloroplasts and peroxisomes.
E) chloroplasts and mitochondria.

E) chloroplasts and mitochondria.

In a plant cell, DNA may be found

A) only in the nucleus.
B) only in the nucleus and mitochondria.
C) in the nucleus, mitochondria, chloroplasts, and peroxisomes.
D) only in the nucleus and chloroplasts.
E) in the nucleus, mitochondria, and chloroplasts.

E) in the nucleus, mitochondria, and chloroplasts.

A cell has the following molecules and structures: enzymes, DNA, ribosomes, plasma membrane, and mitochondria. It could be a cell from

A) an animal, but not a plant.
B) any kind of organism.
C) nearly any eukaryotic organism.
D) any multicellular organism, like a plant or an animal.
E) a bacterium.

C) nearly any eukaryotic organism.

Why isn't the mitochondrion classified as part of the endomembrane system?

A) It is not involved in protein synthesis.
B) It is a static structure.
C) Its structure is not derived from the ER or Golgi.
D) It has too many vesicles.
E) It is not attached to the outer nuclear envelope.

C) Its structure is not derived from the ER or Golgi.

Ions can travel directly from the cytoplasm of one animal cell to the cytoplasm of an adjacent cell through

A) gap junctions.
B) desmosomes.
C) intermediate filaments.
D) tight junctions.
E) plasmodesmata.

A) gap junctions.

Extracellualar matrix proteins are made by ribosomes in which part of a eukaryotic cell?

A) nuclear envelope
B) mitochondria
C) Golgi apparatus
D) rough ER
E) cytoplasm

D) rough ER

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set