Download Take home Quiz #3 - San Diego Mesa College

MESA COLLEGE, SAN DIEGO
SCHOOL OF MATHEMATICS & NATURAL SCIENCES
Intro Molecular Cell Biology (Bio210A); Instructor: Elmar Schmid, Ph.D.
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Answer the following questions and mark it on a Scantron 882 answer sheet. All
questions must be answered by the student without help by class mates, friends or other
human beings. Make sure that you read the following statement below carefully and sign
it if you satisfy the guidelines outlined in this statement. This signed take home exercise
sheet (= page 1 of this document) must be turned in together with your completed
Scantron card in order to receive full credit for this assignment.
This assignment is due at the first class meeting the following week.
I HAVE ANSWERED THE QUESTIONS IN THIS EXERCISE ON MY OWN. I DID NOT CONSULT OTHERS
OR IN ANY CONDUCT IN ANY ACTIVITITES THAT COULD BE CONSTRUED AS CHEATING IN THIS
ASSIGNMENT. I DID NOT MAKE ANY COPIES OF THIS ASSIGNMENT.
_________________________________
(PRINT YOUR NAME)
________________________________
(YOUR SIGNATURE)
Q. 1: Which of the following energy conversions is/are possible in living systems?
A) chemical energy into chemical energy
B) potential energy into thermal energy
C) electromagnetic energy into electric energy
D) chemical energy into kinetic energy
E) both, a and d
Q. 2: Living systems cannot convert energy with 100% conversion efficiency. They obey the
second law of energy.
A) True
B) False
Q. 3: When a living cell uses chemical energy to perform work, it couples a Gibbs free energyreleasing ____ reaction with a(n) _____ reaction
A)
B)
C)
D)
E)
exergonic …… endergonic
endergonic …… exergonic
exergonic …… spontaneous
spontaneous …… exergonic
endergonic …… spontaneous
Q. 4: Which of the following processes is/are exergonic
A) the combustion of wood
B) the combustion of gasoline in the engine of a car
C) the oxidation of glucose in the cell’s of your body
D) the build-up of proteins from amino acids at the ribosome
E) all of the above, except d
Q. 5: Which of the following is NOT a molecular component of the ATP molecue?
A) sulfate
B) phosphate
C) ribose
D) adenine
E) both, a and c
MESA COLLEGE, SAN DIEGO
SCHOOL OF MATHEMATICS & NATURAL SCIENCES
Intro Molecular Cell Biology (Bio210A); Instructor: Elmar Schmid, Ph.D.
Q. 6: Anything that prevents ATP formation in a cell
A) force the cell to relay on ADP for energy
B) forces the cell to relay on lipids for energy
C) results in the conversion of kinetic energy into chemical energy
D) results in cell death
E) have no effect on the cellular energy household
Q. 7: During cellular redox reactions involving NAD+ or FAD it is _____ , which are moved
between two different chemical reaction partners
A) protons
B) outershell electrons
C) outer-and innershell electrons
D) neutrons
E) both, a and b
Q. 8: During the biological degradation of glucose within a cell, the carbon skeleton of glucose is
reduced by enzymes called reductases.
A) True
B) False
Q. 9: Which of the following molecules are capable to interfere with the chemically aggressive
behavior of free radicals in cells, i.e. are known to function as so-called antioxidants?
A) ascorbic acid (= vitamin C)
B) tocopherols (= vitamin E)
C) NADH + H+
D) plastochinone
E) both, a and b
Q. 10: Which of the following metabolic pathways is common to both aerobic and anaerobic
processes of sugar breakdown?
A) Krebs cycle
B) electron transport chain
C) conversion of pyruvate to lactic acid
D) conversion of glucose to pyruvate
E) none of the above
Q. 11: Which of the following is/are NOT a result(s) of glycolysis?
A) reduction of FAD to FADH2
B) release of CO2
C) conversion of glucose into two three-carbon compounds called DAP and GAP (G3P)
D) a net gain of two ATP molecules per glucose molecule
E) both, a and b
Q. 12: Which of the following molecules is/are (an) intermediate product(s) of the glycolysis
pathway?
A) glucose-6-phosphate
B) fructose 1,6-bisphosphate
C) phosphoenolpyruvate
D) malate
E) all of the above, except d
Q. 13: The chemical reactions of the Krebs cycle take place in the matrix of the mitochondria.
A) True
B) False
MESA COLLEGE, SAN DIEGO
SCHOOL OF MATHEMATICS & NATURAL SCIENCES
Intro Molecular Cell Biology (Bio210A); Instructor: Elmar Schmid, Ph.D.
Q. 14: The multi-enzyme complex which connects glycolysis with the Krebs cycle is called
pyruvate oxidase.
A) True
B) False
Q. 15: The first reaction product of the Krebs cycle is a __- carbon molecule called
A) 4 … oxalic acid
B) 4 … maleic acid
C) 6 … citric acid
D) 6 … oxalic acid
E) 5 … ribulose-6-phosphate
Q. 16: Which of the following major food/nutritional components supply(ies) our body with the
highest caloric energy content?
glucose
amino acids
fatty acids
oils
both, c and d
Q. 17: The mitochondrial electron transport chain (ETC) consists of ___ membrane-inserted
protein components most of which have a class of iron-containing redox molecules attached with
which are called _________________ .
A) 3 … ubiquinones
B) 4 … ubiquinones
C) 4 … cytochromes
D) 6 … cytochromes
E) 6 … FAD
Q. 18: Where within a plant cell do the light reactions of photosynthesis take place?
A) in the stroma
B) in the matrix
C) in the thylacoid membrane
D) in the inner chloroplast membrane
E) in the peroxisome
Q. 19: Which of the following photosynthesis pigments is found in the reaction centers of
photosystem I and II or green plants and algae?
A) beta-carotene
B) xanthophyll
C) fucoxanthin
D) chlorophyll a
E) chlorophyll b