Biology Second Exam
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- 1.
Which of the following statements describes the results of this reaction? C6H12O6 + 6 O2 → 6 CO2 + 6 H2O + Energy
- A.
C6H12O6 is oxidized and O2 is reduced
- B.
O2 is oxidized and H2O is reduced.
- C.
CO2 is reduced and O2 is oxidized.
- D.
C6H12O6 is reduced and CO2 is oxidized.
- E.
O2 is reduced and CO2 is oxidized
Correct Answer
A. C6H12O6 is oxidized and O2 is reduced -
- 2.
When a glucose molecule loses a hydrogen atom as the result of an oxidationreduction reaction, the molecule becomes
- A.
Hydrolyzed.
- B.
Hydrogenated.
- C.
Oxidized.
- D.
Reduced.
- E.
An oxidizing agent.
Correct Answer
C. Oxidized. -
- 3.
When a molecule of NAD+ (nicotinamide adenine dinucleotide) gains a hydrogen atom (not a proton), the molecule becomes
- A.
Dehydrogenated.
- B.
Oxidized.
- C.
Reduced.
- D.
Redoxed.
Correct Answer
C. Reduced. -
- 4.
Which of the following statements describes NAD+?
- A.
NAD+ is reduced to NADH during glycolysis, pyruvate oxidation, and the citric acid cycle.
- B.
NAD+ has more chemical energy than NADH.
- C.
NAD+ is oxidized by the action of hydrogenases.
- D.
NAD+ can donate electrons for use in oxidative phosphorylation. E) In the absence of NAD+, glycolysis can still function.
Correct Answer
A. NAD+ is reduced to NADH during glycolysis, pyruvate oxidation, and the citric acid cycle. -
- 5.
Where does glycolysis take place in eukaryotic cells?
- A.
mitochondrial matrix
- B.
Mitochondrial outer membrane
- C.
Mitochondrial inner membrane
- D.
Mitochondrial intermembrane space
- E.
cytosol
Correct Answer
E. cytosol -
- 6.
The ATP made during glycolysis is generated by
- A.
Substrate-level phosphorylation
- B.
electron transport.
- C.
Photophosphorylation.
- D.
Chemiosmosis.
Correct Answer
A. Substrate-level phosphorylation -
- 7.
During glycolysis, when each molecule of glucose is catabolized to two molecules of pyruvate, most of the potential energy contained in glucose is
- A.
Transferred to ADP, forming ATP.
- B.
Transferred directly to ATP.
- C.
Retained in the two pyruvates.
- D.
Stored in the NADH produced
Correct Answer
C. Retained in the two pyruvates. -
- 8.
Starting with one molecule of glucose, the energy-containing products of glycolysis are
- A.
2 NAD+, 2 pyruvate, and 2 ATP.
- B.
2 NADH, 2 pyruvate, and 2 ATP.
- C.
2 FADH2, 2 pyruvate, and 4 ATP.
- D.
6 CO2, 2 ATP, and 2 pyruvate.
Correct Answer
B. 2 NADH, 2 pyruvate, and 2 ATP. -
- 9.
Where are the proteins of the electron transport chain located?
- A.
Cytosol
- B.
Mitochondrial outer membrane
- C.
Mitochondrial inner membrane
- D.
Mitochondrial intermembrane space
Correct Answer
C. Mitochondrial inner membrane -
- 10.
Inside an active mitochondrion, most electrons follow which pathway?
- A.
Glycolysis → NADH → oxidative phosphorylation → ATP → oxygen
- B.
Citric acid cycle → FADH2 → electron transport chain → ATP
- C.
Electron transport chain → citric acid cycle → ATP → oxygen
- D.
Citric acid cycle → NADH → electron transport chain → oxygen
Correct Answer
D. Citric acid cycle → NADH → electron transport chain → oxygen -
- 11.
How many oxygen molecules (O2) are required each time a molecule of glucose (C6H12O6) is completely oxidized to carbon dioxide and water via aerobic respiration,?
- A.
1
- B.
3
- C.
6
- D.
12
Correct Answer
C. 6 -
- 12.
If there are 40 centromeres in a cell at anaphase, how many chromosomes are there in each daughter cell following cytokinesis?
- A.
10
- B.
20
- C.
30
- D.
40
Correct Answer
B. 20 -
- 13.
Why do chromosomes coil during mitosis?
- A.
To increase their potential energy
- B.
To allow the chromosomes to move without becoming entangled and breaking
- C.
To allow the chromosomes to fit within the nuclear envelope
- D.
) to allow the sister chromatids to remain attached
Correct Answer
B. To allow the chromosomes to move without becoming entangled and breaking -
- 14.
Which of the following is a function of those spindle microtubules that do not attach to kinetochores?
- A.
Maintaining an appropriate spacing among the moving chromosomes
- B.
Producing a cleavage furrow when telophase is complete
- C.
Providing the ATP needed by the fibers attached to kinetochores
- D.
Maintaining the region of overlap of microtubules in the cell's center
Correct Answer
D. Maintaining the region of overlap of microtubules in the cell's center -
- 15.
What is a cleavage furrow?
- A.
A ring of vesicles forming a cell plate
- B.
the separation of divided prokaryotes
- C.
A groove in the plasma membrane between daughter nuclei
- D.
The metaphase plate where chromosomes attach to the spindle
Correct Answer
C. A groove in the plasma membrane between daughter nuclei -
- 16.
Which of the following is true concerning cancer cells?
- A.
They do not exhibit density-dependent inhibition when growing in culture.
- B.
When they stop dividing, they do so at random points in the cell cycle.
- C.
They are not subject to cell cycle controls.
- D.
When they stop dividing, they do so at random points in the cell cycle, and they are not subject to cell cycle controls.
- E.
When they stop dividing, they do so at random points in the cell cycle; they are not subject to cell cycle controls; and they do not exhibit density-dependent inhibition when growing in culture.
Correct Answer
E. When they stop dividing, they do so at random points in the cell cycle; they are not subject to cell cycle controls; and they do not exhibit density-dependent inhibition when growing in culture. -
- 17.
Which of the following defines a genome?
- A.
A karyotype
- B.
The complete set of an organism's genes
- C.
The complete set of an organism's polypeptides
- D.
Representation of a complete set of a cell's polypeptides
Correct Answer
B. The complete set of an organism's genes -
- 18.
Which of the following is true of a species that has a chromosome number of 2n = 16?
- A.
The species is diploid with 32 chromosomes per cell.
- B.
The species has 16 sets of chromosomes per cell.
- C.
Each cell has eight homologous pairs.
- D.
During the S phase of the cell cycle there will be 32 separate chromosomes.
Correct Answer
C. Each cell has eight homologous pairs. -
- 19.
Which of the following can utilize both mitosis and meiosis in the correct circumstances?
- A.
A haploid animal cell
- B.
A diploid cell from a plant stem
- C.
Any diploid animal cell
- D.
A plantlike protist
Correct Answer
D. A plantlike protist -
- 20.
ِAfter telophase I of meiosis, the chromosomal makeup of each daughter cell is
- A.
Diploid, and the chromosomes are each composed of a single chromatid.
- B.
Diploid, and the chromosomes are each composed of two chromatids.
- C.
Haploid, and the chromosomes are each composed of a single chromatid.
- D.
Haploid, and the chromosomes are each composed of two chromatids.
Correct Answer
D. Haploid, and the chromosomes are each composed of two chromatids. -
- 21.
Which of the following occurs in meiosis but not in mitosis?
- A.
Chromosome replication
- B.
Synapsis of chromosomes
- C.
Production of daughter cells
- D.
Alignment of chromosomes at the equator
Correct Answer
B. Synapsis of chromosomes -
- 22.
A tetrad includes which of the following sets of DNA strands?
- A.
Two single-stranded chromosomes that have synapsed
- B.
Two sets of sister chromatids that have synapsed
- C.
Four sets of sister chromatids
- D.
Four sets of unique chromosomes
Correct Answer
B. Two sets of sister chromatids that have synapsed -
- 23.
Centromeres of sister chromatids disjoin and chromatids separate.
- A.
Telophase I
- B.
Metaphase I
- C.
Anaphase I
- D.
Prophase II
- E.
Anaphase II
Correct Answer
A. Telophase I -
- 24.
Synaptonemal complexes form or are still present.
- A.
Prophase I only
- B.
Prophase I and Telophase I only
- C.
Prophase I and Telophase II only
- D.
Metaphase I and Metaphase II only
Correct Answer
A. Prophase I only -
- 25.
Crossing over occurs
- A.
Between Chromatids of non homologous
- B.
Between non sister chromatids of homologous
- C.
In prophase I of meiosis I
- D.
B & c
Correct Answer
D. B & c -
- 26.
Female somatic cells in human has :
- A.
46 chromosome
- B.
45 autosomes & Y chromosome
- C.
23 chromosomes
- D.
22 pair of autosomes and 2 Y chromosomes
Correct Answer
A. 46 chromosome -
- 27.
A sexually reproducing cell with 24 chromosomes will have _____ tetrads
- A.
24
- B.
48
- C.
12
- D.
6
Correct Answer
C. 12 -
- 28.
If cytosine make up 28% of the nucleotide in a DNA sample of an organism; then adenine would make up:
- A.
22%
- B.
44%
- C.
28%
- D.
56%
Correct Answer
A. 22% -
- 29.
Before the experiment of bacterial transformation it was thought that the genetic material is:
- A.
RNA
- B.
Protein
- C.
DNA
- D.
Lipid
Correct Answer
B. Protein -
- 30.
The recessive trait appearance among offspring indicates the parents genotype are:
- A.
Both homozygous dominant
- B.
One homozygous and one heterozygous
- C.
Both heterozygous
- D.
One homozygous dominant and one recessive
Correct Answer
C. Both heterozygous -
- 31.
A 1:1 phenotypic ratio in a testcross indicates
- A.
The alleles are dominant
- B.
One parent is homozygous recessive
- C.
The dominant phenotype parent was a heterozygous
- D.
A & b
Correct Answer
C. The dominant phenotype parent was a heterozygous -
- 32.
If the husband is carrier of Tay-sachs desease (recessive) but the wife is homozygous normal, what are their chances of having tay-sachs
- A.
0%
- B.
75%
- C.
50%
- D.
25%
Correct Answer
A. 0% -
- 33.
The phenotypic ratio of a dihyprid cross is 1:1:1:1 , this indicates :
- A.
Self Pollination
- B.
Testcross
- C.
Self pollination of recessive true breeding
- D.
Self pollination of heterozygous
Correct Answer
B. Testcross -
- 34.
Which of the following is not found in the DNA molecule :
- A.
Oxygen
- B.
Nitrogen
- C.
Carbon
- D.
Sulfur
Correct Answer
D. Sulfur -
- 35.
Which of the following is true in a DNA molecule :
- A.
A = C
- B.
A = T & C= G
- C.
A+C = G+T
- D.
B & c
Correct Answer
B. A = T & C= G -
- 36.
Which of the following is involved in chromosome migration during anaphase :
- A.
Motor proteins
- B.
Microtubules
- C.
Kinetechores
- D.
All of the above
Correct Answer
D. All of the above -
- 37.
Cell cycle control system have checkpoints at:
- A.
G1
- B.
M
- C.
G2
- D.
All of the above
Correct Answer
D. All of the above -
- 38.
Cytokinesis is :
- A.
Division of the nucleas
- B.
Division of Cytoplasm
- C.
Happens after metaphase
- D.
B&c
Correct Answer
D. B&c -
- 39.
Genetic Variation among daughter cells of meiosis occurs in :
- A.
Prophase I
- B.
Prophase II
- C.
Anaphase II
- D.
Metaphase I
Correct Answer
A. Prophase I -
- 40.
Sexual lifecycle increase genetic variation through :
- A.
Crossing over
- B.
Independent assortment
- C.
Random Fertilisation
- D.
All are true
Correct Answer
D. All are true -
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Current Version
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Mar 21, 2022Quiz Edited by
ProProfs Editorial Team -
Dec 02, 2016Quiz Created by
Mohammedal0091
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