Answer: Glucose
Question: Carbohydrate is thought to enhance the stability of protein molecules by:
Answer Options:
Changing the protein’s shape to better resist denaturation.
Protecting the underlying protein from the action of proteolytic enzymes.
Linking hydrogen bonding to increase the stability of the protein.
Answer: Both A and B are correct
Question: Choose the amino acid that is the least ideal substrate used to synthesize a stim-lurating neurotransmitter.
Answer Options:
Glutamic acid
Glycine
Tyrosine
Tryptophan
Cysteine
Answer: Glycine
Question: Enzymes are biological catalysts that enhance the rate of a reaction by:
Answer Options:
decreasing the activation energy
decreasing the amount of free energy released
increasing the activation energy
increasing the amount of free energy released
increasing the energy of the transition state
Answer: decreasing the activation energy
Question: A large exoplanet that has a fast orbit near enough to its host star so that the planet is heated like that of 51 Peg b is called a …
Answer: Hot Jupiter
Question: Which of the following molecules are weak acids?
Answer Options:
HCl
CH3^-
HNO3
HCO3^-
Both B and D
Answer: Both B and D (CH3^- and HCO3^-)
Question: a) Indicate if the following are do’s or don’ts for treatment for burning clothing: b) Bringing person with burning clothing to safety shower do c) Using the hood alone to dispose of chemicals by evaporation don’t
Answer: a) don’t
b) do
Question: What state of matter is the Sun?
Answer Options:
Plasma
Solid
Liquid
Gas
Answer: Plasma
Question: Consider the following overall reaction: cytochrome c (+2, Ferrodoxin oxidized) <=> cytochrome c (+3, Ferrodoxin reduced) The half cell reactions with their standard reduction potentials are: Half cell reaction 1: cytochrome c (+3) + 1e- <=> cytochrome c (+2) E° = +0.22 Half cell reaction 2: Ferrodoxin (oxidized) + 1e- <=> Ferrodoxin (reduced) E° = -0.43 What is the reduction potential for the overall reaction (delta E°)?
Answer Options:
+0.22
+0.65
-0.65
+2.82
-2.21
Answer: +0.65
Question: The most abundant organic substance on earth is ______.
Answer Options:
Starch
Cellulose
Sucrose
Glucose
Answer: Cellulose
Question: Which of the following is a hydronium ion?
Answer Options:
H3O+
OH^-
HCO3^-
HOCH2
H2O+
Answer: H3O+
Question: Which type of the six enzyme reactions are depicted in the image below.
Answer Options:
Transferase
Hydrolase
Isomerase
Ligase
Answer: Transferase
Question: In glycolysis ______ moles of NADH are produced per mole of glucose consumed.
Answer Options:
1
2
Answer: 2
Question: The washing step of recrystallization removes which category of impurities?
Answer Options:
a. on the surface of the solid
b. within the crystal lattice
Answer: a. on the surface of the solid
Question: Which one of the following has the cellular components arranged in order of increasing size? Amino acid > protein > ribosome > ribonuclein Amino acid > protein > ribosome > mitochondrion Amino acid > ribosome > protein > mitochondrion Protein > amino acid > ribosome > ribonuclein Protein > ribosome > mitochondrion > amino acid
Answer: Amino acid > protein > ribosome > mitochondrion
Question: What should you always do before lighting a match in the lab?
Answer: Keep an eye out for flammable liquids/vapors in the area. Flammable liquid vapors are always heavier than air, they will travel along the tops of benches, down drain troughs, and remain in sinks.