set a Flashcards
(2E,3S)-2,3-dihydroxybutanedioic acid and (2S,3R)-2,3-dihydroxybutanedioic acid are:
I. Meso compounds
II. The same molecules
III. Enantiomers
a. I and II
b. I and III
c. I, II, and III
I and II
A biomolecule that is composed of a nitrogenous base linked to a sugar with at least one phosphate group attached.
a. Nucleotides
b. Nucleus
c. Nucleosides
d. Nucleic Acids
Nucleotides
A substance that is NOT generally considered to be a toxic pollutant in water is
a. Cadmium
b. Lead
c. Carbonic Acid
d. Mercury
Carbonic Acid
What do you call the process by which the information in DNA is transferred to RNA?
a. Ubiquitination
b. Translation
c. Replication
d. Transcription
Transcription
Why do alcohols are much stronger acids than alkanes?
a. Because the electronegativity of oxygen is substantially greater than that of carbon and hydrogen.
b. Because both carbon and hydrogen are electrophilic in alcohols.
c. Because the covalent bonds of the alcohol functional group are polarized.
d. All of the choices
All of the choices
Which type of reaction is characterized by replacement of an atom or group by another; in this reaction type, the number of bonds does not change except or the added groups?
a. Elimination
b. Addition
c. Substitution
d. Free radical
Substitution
Which pair of elements could not be produced from neutron bombardment of uranium-235 if 2 additional neutrons are also produced?
a. bromine-87 and lanthanum-147
b. zirconium-97 and barium-139
c. cesium-143 and rubidium-91
d. tellerium-137 and zirconium-97
zirconium-97 and barium-139
Which of these compounds has a nonzero dipole moment?
a. boron trifluoride
b. water
c. carbon dioxide
d. methane
water
Which of the following statements most accurately describes the energy of the activated complex also called transition state?
a. The transition state is lower than the energy of the reactants but higher than the energy of the products.
b. The transition state is lower than the energy of both the reactants and the products.
c. The transition state is higher than the energy of the reactants but lower than the energy of the products.
d. The transition state is higher than the energy of both the reactants and the products.
The transition state is higher than the energy of both the reactants and the products.
What do you call the charge neutralization step that involves the conditioning of suspended, colloidal and dissolved matter by the addition of chemicals?
a. Flocculation
b. Coagulation
c. Settling
d. Filtration
Coagulation
The rate of an enzymatic reaction can be regulated by
a. pH
b. temperature
c. concentration
d. all of the choices
all of the choices
Which among the pair below is wrong about the relative strength f the polymer? The relative strength of the polymer types is indicated with the stronger polymer on the right.
a. low molecular weight < high molecular weight
b. polyamide < polyethylene
c. branched < linear
d. low density < high density
polyamide < polyethylene
Select the correct statement among the following choices.
a. Protein synthesis takes place in the cytoplasm of the cell.
b. Each gene in the DNA molecule codes for a specific protein.
c. Messenger RNA can be found in both nucleus and the cytoplasm of each cell.
d. All of these.
All of these
The environmentally worst condition for metal-contaminated lake is
a. low redox potential and high pH
b. low redox potential and low pH
c. high redox potential and high pH
d. high redox potential and low pH
low redox potential and low pH
Which among the compounds will be most resistant to biodegradation?
a. toluene
b. p-xylene
c. perchloroethane
d. ethylbenzene
perchloroethane
Propane undergoes dehydrogenation. What is the product?
a. trans-1-propene
b. cis-1-propene
c. 1-propene
d. 2-propene
1-propene
Why are reversible processes frictionless?
a. because the processes are driven by forces which imbalance is differential in magnitude.
b. because when reversed, retraces its forward path and restores the initial state of the system and surroundings.
c. because only infinitesimal changes occur.
d. none of the choices
because when reversed, retraces its forward path and restores the initial state of the system and surroundings
Consider three molecular weight, one a hydrocarbon, another a primary alcohol, and the third a carboxylic acid. Arrange the molecules in order from highest to lowest boiling point.
a. hydrocarbon, carboxylic acid, alcohol
b. carboxylic acid, alcohol, hydrocarbon
c. hydrocarbon, alcohol, carboxylic acid
d. carboxylic acid, hydrocarbon, alcohol
carboxylic acid, alcohol, hydrocarbon
Complexes of a given metal with ligands higher in the spectrochemical series will display _____ crystal-field splitting and a(an) _____ tendency towards high-spin complexes, and absorb light towards the _____ end of the spectrum.
a. smaller; decreased; red
b. larger; increased; blue
c. larger, decreased; blue
d. smaller; increased; blue
larger, decreased; blue
Which of the following statements about enzymes is incorrect?
a. They are equal to inorganic catalysts in efficiency.
b. The molecules they react with are called substrates.
c. Several hundred are now known.
d. They are proteins that catalyze specific biologic reactions.
They are equal to inorganic catalysts in efficiency
What basic organic functional group does the receptors in our sense of smell nd taste are made up of?
a. alcohol
b. amino acid
c. ester
d. ketone
amino acid
Which statement is incorrect?
a. All voltaic cells are electrolytic cells.
b. Metals corroded by an electrolytic process.
c. All electrolytic cells are voltaic cells.
d. Voltaic cells and electrolytic cells are both electrochemical cells.
Voltaic cells and electrolytic cells are both electrochemical cells
What step of addition polymerization will result to the addition of one monomer molecule to form a new polymer molecule, which is one repeating unit longer with a new active center?
a. Initiation
b. Propagation
c. Termination
d. Combination
Propagation
Which of the following particles have a mass of 0.00055 amu and a charge of (-1)?
a. Alpha particle
b. Beta particle
c. Gamma ray
d. Positron particle
Beta particle
What organic compound becomes more soluble in water upon addition of NaOH?
a. amine
b. amino acid
c. carboxylic acid
d. carboxylic anhydride
e. amide
f. aromatic hydrocarbon
g. alkane
carboxylic acid
Which of the following statements is true about the octahedral complexes of Ni2+?
a. Both strong- and weak-field complexes are diamagnetic.
b. The strong-field complex is diamagnetic and the weak-field complex is paramagnetic.
c. Both strong- and weak-field complexes are paramagnetic.
d. The strong-field complex is paramagnetic and the weak-field complex is diamagnetic.
Both strong- and weak-field complexes are paramagnetic
