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Biology, 7th Edition (Book & CD-ROM)
What is the difference between DNA and RNA?
Which of the following is NOT an animal or plant intercellular junction?
What is NOT true about microtubules?
Different types are found in different cell types.
The carbonyl group of a monosaccharide is NOT required for
Solubility of water
When the cytoplasm of a cell is hypertonic to its environment,
Osmosis will cause the cell to lyse.
Which of the following statements is TRUE about facilitated diffusion?
It is a passive process in which molecules move from a region of higher concentration to a region of lower concentration.
Which type of bonds stabilizes the secondary structure of a protein?
What is TRUE about saturated fatty acids?
They contain more hydrogen than unsaturated fatty acids having the same number of carbon atoms.
Which is TRUE about the fluid mosaic model?
Some organisms change fatty acid composition with temperature changes.
What will be the most permeant across a lipid bilayer?
small hydrophobic molecules
The Na+, K+ pump does not
transport equal amounts of Na+ and K+ per cycle.
Which of the following structure is found in all eukaryotic cell?
Which of the following will NOT change a protein function?
none of the above
Which statement comparing glycogen and cellulose is TRUE?
The carbonyl arrangement is an aldose.
Vesicular traffic would NOT link what two compartments of the endomembrane system?
smooth and rough endoplasmic reticulum
What is a function of the rough endoplasmic reticulum?
What is NOT an amphipathic molecule?
The 20 different amino acids found in polypeptides exhibit different chemical and physical properties because of different
side chains (R groups).
What is TRUE about polar covalent bonds?
Are required for hydrogen bond formation.
A molecule with the chemical formula C18H36O18 is probably a
The lumen compartment of the endomembrane system
is equivalent to the extracellular space.
What do atoms form when they share electron pairs?
Nitrogen (N) is much more electronegative than hydrogen (H). Which of the following statements is correct about the atoms in ammonia (NH3)?
Each hydrogen atom has a partial positive charge.
What results from an unequal sharing of electrons between atoms.
A polar covalent bond
Research suggests that side effects from Ritalin, the drug used to treat attention deficit disorder, may be caused by contamination of enantiomers, or molecules that
are mirror images of one another.
Under which of the following conditions would you expect to find a cell with a predominance of free ribosomes?
Cell that is producing cytoplasmic and nuclear proteins
Which two functional groups are ALWAYS found in amino acids?
carboxyl and amino
Which of the following is NOT a known function of the cytoskeleton?
to maintain a critical limit on cell size
Ions can travel directly from the cytoplasm of one animal cell to the cytoplasm of an adjacent cell through
The bonding of two amino acid molecules to form a larger molecule requires which of the following?
Removal of a water molecule
The tertiary structure of a protein is the
unique three-dimensional shape of the fully folded polypeptide.
Altering which of the following levels of structural organization could change the function of a protein?
All of the above
All of the following molecules are part of the animal cell membrane except
What membrane-surface molecules are thought to be most important as cells recognize each other?
What is NOT true about structural isomers?
require an asymmetric carbon
What bond does NOT depend on electrostatic attraction?
Polar covalent bond
The diffusion of an ion is NOT dependent on
the concentrations of other ions.
Active transport depending on ATP hydrolysis does NOT
have a constant binding affinity for the transported ion.
Which statement is TRUE about cotransport?
It utilizes an ion electrochemical gradient.
A weak acid
is ionized by dissociation of a hydrogen ion.
Which statement is TRUE about osmosis?
Occurs from lower solute concentration to higher solute concentration.
Which of the following pairs of functional groups at neutral pH might form H bond with one another?
carbonyl and hydroxyl
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