Lecture Exam 3

Navigation » List of Schools » Prince George Community College » Biology » Bio 2010 – Microbiology » Spring 2023 » Lecture Exam 3

Need help with your exam preparation?

Existing Quiz Clients Login here

Below are the questions for the exam with the choices of answers:

Try The Exam

Question #1

During translation, tRNAs anticodons recognize and attach to mRNA codons. What specifically do tRNAs bring to translation?

A an amino acid

B a protein

C a lipid

D a sugar

Question #2

If ATCG is the triplet DNA code, then the ANTICODON would be:

A UAGC

B TAGC

C AUGC

D UTGC

Question #3

In our lecture, I compared condons to:

A people on the bus

B MnMs in a bag of candy

C words of a language

D stars in the universe

Question #4

Which of the following is the best description of a gene?

A the entire DNA molecule

B a single nucleotide

C a sequence of amino acids in a protein

D a sequence of DNA nucleotides that codes for a single protein

Question #5

There are 64 codons and 20 amino acids. Which of the following is true?

A Some amino acids have no link to a codon.

B Several different codons can specify the same amino acid.

C Each codon specifies a different amino acid.

D Each amino acid is specified by only one codon.

Question #6

Which enzyme unzips or separates the DNA helix in order to expose the two parental DNA strands and creates a replication fork?

A DNA polymerase

B DNA helicase

C DNA ligase

D DNA gyrase

Question #7

All of the following are true statements concerning DNA structure, EXCEPT:

A the two strands of a DNA molecule are held together by hydrogen bonds.

B the two strands of a DNA molecule are antiparallel to each other.

C DNA contains the nitrogenous bases A, C, G, and U.

D DNA contains the sugar deoxyribose.

Question #8

DNA molecules are made up of subunits called nucleotides. How many different types of nucleotides are used to make DNA molecules?

A three types

B two types

C four types

D one type

Question #9

Where does the energy come from to replicate complimentary copy DNA strands?

A kinetic charge attraction

B osmosis

C electrical charge attraction

D diffusion

E dNTP’ s

Question #10

A type of substitution in which no amino acids change is called:

A nonsense

B Deletion

C silent

D missense

Question #11

A nonsenese mutation is a point mutation, usually in the second nucleotide position, and does which of the following?

A introduces a stop codon

B creates a new protein

C changes one single amino acid

D eliminates the start codon

E deletes the entire protein

Question #12

Original DNA sequence: ATC CAT
Mutated DNA sequence: ATC GCAT.
What type of mutation occurred?

A insertion

B silent

C deletion

D point mutation

Question #13

Which of the following mutations results in a non-functional protein because a stop codon appeared too early in the mRNA sequence?

A silent

B nonsense

C frameshift

D missense

Question #14

The transfer of genetic material between two bacteria in direct physical contact through the use of a pilus is called:

A transformation

B vertical gene transfer

C conjugation

D transduction

Question #15

In Griffith’s experiments, the transforming substance was:

A RNA

B proteins

C DNA

D enzymes

Question #16

Bacterial conjugation is an example of:

A bacterial transformation

B transduction

C horizontal gene transfer

D vertical gene transfer

Question #17

Genes transferred from one cell to another is called:

A gene transfer

B horizontal gene transfer

C vertical gene transfer

D transfer of gene

Question #18

The lac operon genes only become expressed if:

A the repressor binds to the operator

B glucose binds to the repressor

C lactose binds to the operator

D lactose binds to the repressor

Question #19

The lactose operon is likely to be transcribed when:

A the cyclic AMP levels are low.

B the cyclic AMP and lactose levels are both high within the cell.

C there is glucose but no lactose in the cell.

D there is more glucose in the cell than lactose.

E the cAMP level is high and the lactose level is low.

Question #20

Transcription of the structural genes in an inducible operon:

A stops when the pathway’s product is present.

B starts when the pathway’s substrate is present.

C occurs continuously in the cell.

D starts when the pathways product is present.

E does not result in the production of enzymes.

Question #21

Which of the following statements is TRUE regarding gene regulation in bacteria?

A activator proteins bind near promoters and increase efficiency of translation.

B repressor proteins block transcription by binding to operator sequences.

C small-molecule sensors usually bind DNA and change its 3D structure allosterically.

D genes with related functions are often grouped together and have a single start codon.

E enhancers are commonly used to regulate transcription.

Question #22

In eukaryotes, gene expression is primarily regulated at the level of:

A transcription

B protein synthesis

C replication

D translation

Question #23

During the reduction phase of the Calvin-Benson cycle, phosphoglyceric acid is ultimately reduced in order to make:

A ribulose 1,5 â bisphosphate (RuBP); NADP+ & H+

B pyruvic acid; NADP+ & H+

C phosphoglyceraldehyde; ATP

D phosphoglyceraldehyde; NADP & H+

Question #24

A photosynthetic bacteria is exposed to a toxin that destroys NADPH. The levels of RuBP and glucose should:

A glucose increases and RuBP decreases

B both increase

C RuBP increases and glucose decreases

D both decrease

Question #25

Which of the following is released as a photosynthesis byproduct or waste product?

A water

B carbon dioxide

C carbon

D oxygen

Question #26

Which of the following is a Photosystem II specific product?

A phosphogyceric acid

B CO2

C NADPH

D Glucose

E ATP

Question #27

The Kreb’s cycle completes two full turns for the oxidation of all pyruvic acid from glycolysis. How many total NADH molecules are made from Krebs cycle reactions only?

A 8

B 0

C 2

D 4

E 6

Question #28

Pyruvic acid, the end product of glycolysis, enters the citric acid cycle after it has been converted to:

A oxaloacetic acid.

B acetyl-CoA.

C none of these.

D citric acid.

E NADH.

Question #29

Which of the following is NOT a similarity that BOTH the Kreb’s and the Calvin Benson cycle share, or have in common?

A both cycles have more than one chemical reaction

B both cycles oxidize compounds

C both cycles recycle their final products

D both cycles produce ATP

E both cycles can start and stop

Question #30

Pyruvic acid cannot advance into the Krebs cycle. It must first be converted into a product that can be further oxidized in Krebs cycle. What is the name of this transformed molecule that starts Krebs cycle?

A phosphoglyceric acid

B CO2

C NAD+

D acetyl CoA

E oxaloacetic acid

Question #31

ATP is an energy rich molecule because:

A the three phosphate groups are strongly attracted to each other.

B the bonds between the phosphate groups are very stable.

C the sugar in ATP has numerous carbon-hydrogen bonds.

D the bonds between the phosphate groups are unstable.

Question #32

Which of the following statements regarding glycolysis is FALSE?

A oxidation of glucose yields pyruvic acid

B oxidation of glucose yields ATP

C oxidation of glucose yields NADH

D oxidation of glucose is complete

Question #33

Fermentation pathways make ATP and NADH. The ATP is used for a variety of cell functions. Why do fermenting cells need to make NADH?

A to make more toxic final products

B to use in the Kreb’s cycle

C to make less toxic final products

D to use in the Electron Transport System

E to use in the transition reaction

Question #34

Microbial fermentation can be detected in laboratory identification by observing a change in:

A pH

B temperature

C oxygen levels

D glucose levels

Question #35

Which of the following best describes enzyme saturation?

A enzymes active site is not occupied by anything

B enzymes active site is occupied by substrate

C enzymes active site is occupied ATP

D enzymes active site is occupied by O2

Question #36

An oxidation enzymatic reaction is a reaction that:

A increases the pH

B loses an electron

C decreases the temperature

D gains an electron

Question #37

Substrates and enzymes capable of interacting to form products in a chemical reaction, must first overcome a thermodynamic barrier known as the reaction’s:

A equilibrium point.

B entropy.

C activation energy.

D free-energy content.

E endothermic level.

Question #38

How does extreme temperature affect mesophilic proteins?

A breaks chemical bonds

B destroys products

C preserves existing chemical bonds

D destroys substrates

Question #39

Which of the following does NOT directly affect the activity of an enzyme?

A pH

B temperature

C oxygen concentration

D substrate concentration

Question #40

What is the difference between a reversible and non-reversible, competitive inhibitor?

A both permanently attaches to the enzymes active site

B both permanently attaches to the enzymes allosteric site

C reversible temporarily attaches to the enzymes active site

D neither one attaches to any location on an enzyme

Question #41

Which of the following statements is an accurate description of what happens in electron transport?

A The electrons gain energy with each transfer in the chain.

B NADH and FADH are oxidized.

C NADH and FADH are reduced.

D The final electron acceptor is oxidized.

Question #42

In the final step of the electron transport system, the rotation of the proton pump provides the energy for ATPase to enzymatically make ATP. What specifically is responsible for rotating this pump?

A Proton motive force from incoming O2

B Proton motive force from income CO2

C Proton motive force from incoming H+ ions

D Proton motive force from incoming ATP

Question #43

The proton motive force is:

A the movement of flagella

B the movement of water across a membrane

C ATP accumulation in the plasma membrane

D the accumulation of water formed in respiration

E a H+ electrochemical gradient formed across the plasma membrane

Question #44

Dinitrophenol (DNP) is a drug that has the ability to separate the flow of electrons through the electron transport and ATP proton pumps, used during the electron transport system. This means that the energy from electron transfer cannot be used for ATP synthesis. Assuming your bacteria has consumed DNP, how many ATPs would they produce form the complete, aerobic oxidation of one glucose molecule?

A 4

B 2

C 0

D 38

Question #45

What phase of cellular respiration has the highest ATP yield?

A the transition reaction

B oxidative phosphorylation

C fermentation

D glycolysis

E the Kreb’s cycle

Question #46

Why is oxygen necessary in aerobic cellular respiration?

A it is needed for glycolysis, which begins the process of respiration in cells.

B it provides the hydrogen nuclei needed to create a proton gradient outside of the cell

C it is the final electron acceptor in the electron transport chain.

D it is important in creating oxaloacetic acid in the Krebs cycle.

Try The Exam

Fresh Grad Lands Job as Real Estate Agent With Help from Professional Writers

Need help with your exam preparation?

Below are the questions for the exam with the choices of answers:

Christian S.

Tyra

Linda

Manush

We accept payment