84 notecards = 21 pages (4 cards per page)
Which of the following is a hydrophobic material?
B) table salt
We can be sure that a mole of table sugar and a mole of vitamin C are equal in their
C) number of atoms
D) number of molecules
Measurements show that the pH of a particular lake is 4.0. What is the hydrogen ion concentration of the lake?
A) 4.0 M
B) 10-10 M
C) 10-4 M
D) 104 M
Measurements show that the pH of a particular lake is 4.0. What is the hydroxide ion concentration of the lake?
D) 10.0 M
A slice of pizza has 500 kcal. If we could burn the pizza and use all the heat to warm a 50L contained of cold water, what would be the approximate increase in the temperature of the water? (Note: A liter of cold water weighs about 1 kg.)
Organic chemistry is currently defines as
A) the study of compounds made only by living cells
B) the study of carbon compounds
C) the study of natural (as opposed to synthetic) compounds
D) the study of hydrocarbons
Which functional group is not present in this molecule?
Which chemical group is most likely to be responsible for an organic molecule behaving as a base?
Which of the following hydrocarbons has a double bond in its carbon skeleton?
Choose the term that correctly describes the relationship between these two sugar molecules:
A) structural isomers
B) cis-trans isomers
Identify the asymmetric carbon in this molecule
A) SEE IMAGE
B) SEE IMAGE
C) SEE IMAGE
D) SEE IMAGE
Which action could produce a carbonyl group?
A) the replacement of the -OH of a carboxyl group with hydrogen
B) the addition of a thiol to a hydroxyl
C) the addition of a hydroxyl to a phosphate
D) the replacement of the nitrogen of an amine with oxygen
Which of the following categories includes all others in the list?
The enzyme amylase can break glycosidic linkages between glucose monomers only if the monomers are in the α form. Which of the following could amylase break down?
A) glycogen, starch, and amylopectin
B) glycogen and cellulose
C) cellulose and chitin
D) starch, chitin, and cellulose
Which of the following is true of unsaturated fats?
A) They are more common in animals than in plants
B) They have double bonds in the carbon chains of their fatty acids
C) They generally solidify at room temperature
D) They contain more hydrogen than do saturated fats having the same number of carbon atoms.
The structural level of a protein least affected by a disruption in hydrogen bonding is the
A) primary level
B) secondary level
C) tertiary level
D) quaternary level
Enzymes that break down DNA catalyze the hydrolysis of the covalent bonds that join nucleotides together. What would happen to DNA molecules treated with these enzymes?
A) The two strands of the double helix would separate
B) The phosphodiester linkages of the polynucleotide backbone would be broken
C) The pyrimidines would be separated from the deoxyribose sugars
D) All bases would be separated from the deoxyribose sugars
The molecular formula for glucose is C6H12O6. What would be the molecular formula for a polymer made by linking ten glucose molecules together by dehydration reactions?
D) C60 H111O51
Which of the following pairs of base sequences could form a short stretch of a normal double helix of DNA?
A) 5'-AGCT-3' with 5'-TCGA-3'
B) 5'-GCGC-3' with 5'-TATA-3'
C) 5'-ATGC-3' with 5'-GCAT-3'
D) All of these pairs are correct
Which structure is not part of the endomembrane system?
A) nuclear envelope
B) Golgi apparatus
D) plasma membrane
Which structure is common to plant and animal cells?
B) central vacuole
Which of the following is present in a prokaryotic cell?
C) nuclear envelope
Which structure-function pair is mismatched?
A) microtubule; muscle contraction
B) ribosome; protein synthesis
C) Golgi; protein trafficking
D) nucleolus; production of ribosomal subunits
Cyanide binds to at least one molecule involved in producing ATP. If a cell is exposed to cyanide, most of the cyanide will be found within the
What is the most likely pathway taken by a newly synthesized protein that will be secreted by a cell?
A) Golgi → ER → lysosome
B) nucleus → ER → Golgi
C) ER → Golgi → vesicles that fuse with plasma membrane
D) Er → lysosomes → vesicles that fuse with plasma membrane
Which cell would be best for studying lysosomes?
A) muscle cell
B) nerve cell
C) phagocytic white blood cell
D) bacterial cell
In what way do the membranes of a eukaryotic cell vary?
A) Phospholipids are found only in certain membranes
B) Certain proteins are unique to each membrane
C) Only certain membranes of the cell are selectively permeable
D) Only certain membranes are constructed from amphipathic molecules
According to the fluid mosaic model of membrane structure, proteins of the membrane are mostly
A) spread in a continuous layer over the inner and outer surfaces of the membrane
B) confined to the hydrophobic interior of the membrane
C) embedded in a lipid bilayer
D) randomly oriented in the membrane, with no fixed inside-outside polarity
Which of the following factors would tend to increase membrane fluidity?
A) A greater proportion of unsaturated phospholipids
B) a greater proportion of saturated phospholipids
C) A lower temperature
D) a relatively high protein content in the membrane
Which of the following processes includes all the others?
B) diffusion of a solute across a membrane
C) passive transport
D) transport of an ion down its electrochemical gradient
Which of these experimental treatments would increase the rate of sucrose transport into a plant cell?
A) decreasing extracellular sucrose concentration
B) decreasing extracellular pH
C) decreasing cytoplasmic pH
D) adding a substance that makes the membrane more permeable to hydrogen ions
Binding of a signaling molecule to which type of receptor leads directly to a change in the distribution of ions on opposite sides of the membrane?
A) intracellular receptor
B) G protein-coupled receptor
C) phosphorylated receptor tyrosine kinase dimer
D) ligand-gated ion channel
The activation of receptor tyrosine kinases is characterized by
A) dimerization and phosphorylation
B) dimerization and IP3 binding
C) a phosphorylation cascade
D) GTP hydrolysis
Lipid-soluble signaling molecules, such as aldosterone, cross the membranes of all cells by affect only target cells because
A) only target cells retain the appropriate DNA segments
B) intracellular receptors are present only in target cells
C) only target cells have enzymes that break down aldosterone
D) only in target cells is aldosterone able to initiate the phosphorylation cascade that turns genes on
Consider this pathway: epinephrine → G protein-coupled receptor → G protein → adenylyl cyclase → cAMP. Identify the second messenger.
B) G protein
D) adenylyl cyclase
Apoptosis involves all but which of the following?
A) fragmentation of the DNA
B) cell-signaling pathways
C) lysis of the cell
D) digestion of cellular contents by scavenger cells
Which observation suggested to Sutherland the involvement of a second messenger in epinephrine's effect on liver cells?
A) Enzymatic activity was proportional to the amount of calcium aded to a cell-free extract
B) Receptor studies indicated that epinephrine was a ligand.
C) Glycogen breakdown was observed only when epinephrine was administered to intact cells
D) Glycogen breakdown was observed when epinephrine and glycogen phosphorylase were combined
Protein phosphorylation is commonly involved with all of the following except
A) activation of receptor tyrosine kinases
B) activation of protein kinase molecules
C) activation of G protein-coupled receptors
D) regulation of transcription by signaling molecules
Through a microscope, you can see a cell plate beginning to develop across the middle of a cell and nuclei forming on either side of the cell plate. This cell is most likely
A) an animal cell in the process of cytokinesis
B) a plant cell in the process of cytokinesis
C) a bacterial cell dividing
D) a plant cell in metaphase
Vinblastine is a standard chemotherapeutic drug used to treat cancer. Because it interferes with the assembly of microtubules, its effectiveness must be related to
A) disruption of mitotic spindle formation
B) suppression of cyclin production
C) myosin denaturation and inhibition of cleavage furrow formation
D) inhibition of DNA synthesis
One difference between cancer cells and normal cells is that cancer cells
A) are unable to synthesize DNA
B) are arrested at the S phase of the cell cycle
C) continue to divide even when they are tightly packed together
D) cannot function property because they are affected by density-dependent inhibition
The decline of MPF activity at the end of mitosis is due to
A) the destruction of the protein kinase Cdk
B) decreased synthesis of Cdk
C) the degradation of cyclin
D) the accumulation of cyclin
In the cells of some organisms, mitosis occurs without cytokinesis. This will result in
A) cells with more than one nucleus
B) cells that are unusually small
C) cells lacking nuclei
D) cell cycles lacking an S phase
Which of the following does not occur during mitosis?
A) condensation of the chromosomes
B) replication of the DNA
C) separation of sister chromatids
D) spindle formation
A particular cell has half as much DNA as some other cells in a mitotically active tissue. The cell in question is most likely in
The drug cytochalasin B blocks the function of actin. Which of the following aspects of the animal cell cycle would be most disrupted by cytochalasin B?
A) spindle formation
B) spindle attachment to kinetochores
C) cell elongation during anaphase
D) cleavage furrow formation and cytokinesis
The slight negative charge at one end of one water molecule is
attracted to the slight positive charge of another water molecule.
What is this attraction called?
The partial negative charge in a molecule of water occurs because
Which of the following effects is produced by the high surface
tension of water?
Which of the following takes place as an ice cube cools a drink?
A dietary Calorie equals 1 kilocalorie. Which of the following
statements correctly defines 1 kilocalorie?
Liquid water's high specific heat is mainly a consequence of the
Hydrophobic substances such as vegetable oil are
One mole (mol) of glucose (molecular mass = 180 daltons) is
The molar mass of glucose is 180 g/mol. Which of the following
procedures should you carry out to make a 1 M solution of glucose?
The molar mass of glucose (C₆H₁₂O₆) is 180 g/mol. Which of the following procedures should you carry out to make a 0.5 M solution of glucose?
A) Dissolve 0.5 g of glucose in a small volume of water, and then
add more water until the total volume of solution is 1 L.
Based on your knowledge of the polarity of water molecules, the
solute molecule depicted here is most likely
Which of these molecules would be soluble in water?
Testosterone and estradiol are male and female sex hormones,
respectively, in many vertebrates. In what way(s) do these molecules
differ from each other?
Which molecule shown above contains a functional group that cells use
to transfer energy between organic molecules?
Which molecule shown above can function as a base?
Why are human sex hormones considered to be lipids?
What is the chemical reaction mechanism by which cells make polymers
The evolution of eukaryotic cells most likely involved
The chemical reactions involved in respiration are virtually
identical between prokaryotic and eukaryotic cells. In eukaryotic
cells, ATP is synthesized primarily on the inner membrane of the
mitochondria. In light of the endosymbiont theory for the evolutionary
origin of mitochondria, where is most ATP synthesis likely to occur in
A primary objective of cell fractionation is to
Which of the following is a major cause of the size limits for
certain types of cells?
Which of the following statements concerning bacteria and archaea
cells is correct?
Recent evidence shows that signals from the extracellular matrix
(ECM) can regulate the expression of genes in the cell nucleus. A
likely mechanism is that
Signals between the ECM and the cytoskeleton may be transmitted
The sodium-potassium pump is called an electrogenic pump because it
Using the yeast signal transduction pathways, both types of mating
cells release the mating factors. These factors bind to specific
receptors on the correct cells,
Which of the following is characterized by a cell releasing a signal
molecule into the environment, followed by a number of cells in the
immediate vicinity responding?
In yeast signal transduction, the yeast cells
When a neuron responds to a particular neurotransmitter by opening
gated ion channels, the neurotransmitter is serving as which part of
the signal pathway?
Of the following, a receptor protein in a membrane that recognizes a
chemical signal is most similar to
In general, a signal transmitted via phosphorylation of a series of
In which of the following ways do plant hormones differ from hormones
In an experiment to track the movement of growth factor molecules
from secretion to the point of receptor binding in a particular
species of mammal, a student found a 20-fold reduction in mm traveled
when in the presence of an adrenal hormone. This is in part
attributable to which of the following?
In the formation of biofilms, such as those forming on unbrushed
teeth, cell signaling serves which function?
A strong acid like HCl
Which of the following statements is true about buffer solutions?
Buffers are substances that help resist shifts in pH by
One of the buffers that contribute to pH stability in human blood is
carbonic acid (H₂CO₃). Carbonic acid is a weak acid that dissociates
into a bicarbonate ion (HCO₃⁻) and a hydrogen ion (H⁺). Thus,