Question 1

What is the purpose of gel electrophoresis?

Accepted Answer

To separate DNA fragments based on their size

Answer

To separate DNA fragments based on their concentration

Answer

To separate DNA fragments based on their fluorescence

Answer

To separate DNA fragments based on their charge

Question 2

What is the source of the negative charge in DNA fragments?

Accepted Answer

The sugar-phosphate backbone

Answer

The nitrogenous bases

Answer

The hydrogen bonds

Answer

The secondary structure

Question 3

What type of gel is typically used for DNA separation?

Accepted Answer

Agarose

Answer

Polyacrylamide

Answer

Silica

Answer

Cellulose

Question 4

What is the role of the DNA ladder in gel electrophoresis?

Accepted Answer

It serves as a standard reference for determining the size of DNA fragments

Answer

It helps to keep the gel in the electrophoresis chamber

Answer

It binds to the DNA fragments to make them visible

Answer

It helps to conduct electricity through the gel

Question 5

Where are the DNA samples loaded in the gel electrophoresis procedure?

Accepted Answer

At the negative electrode end of the gel

Answer

On the surface of the gel

Answer

At the positive electrode end of the gel

Answer

In the middle of the gel

Question 6

Which electrode do the DNA fragments migrate towards during electrophoresis?

Accepted Answer

The positive electrode

Answer

It depends on the gel type

Answer

The gel does not move

Answer

The negative electrode

Question 7

How is the gel typically visualized after electrophoresis?

Accepted Answer

By UV light

Answer

By X-rays

Answer

By radioactive isotopes

Answer

By infrared radiation

Question 8

What is the advantage of capillary electrophoresis over gel electrophoresis?

Accepted Answer

All of the above (It is more precise, can separate smaller fragments, faster)

Answer

It is faster

Answer

It can separate smaller fragments

Answer

It is more precise

Question 9

How are the DNA fragments separated in Size Exclusion Chromatography?

Accepted Answer

By the size of the fragments passing through porous beads

Answer

By the fluorescent properties

Answer

Using an Electric current

Answer

Based on the charge of DNA fragments

Question 10

How many replicates of your samples should be run in gel electrophoresis?

Accepted Answer

Multiple replicates

Answer

It depends on the experiment

Answer

2-3

Answer

Only one

Question 11

What is the main function of the buffer in gel electrophoresis?

Accepted Answer

To conduct electricity through the gel

Answer

To keep the gel hydrated

Answer

To dissolve the DNA fragments

Answer

To cool the gel

Question 12

What is the typical voltage range used for running agarose gel electrophoresis?

Accepted Answer

100-300 V

Answer

300-500 V

Answer

500-1000 V

Answer

50-100 V

Question 13

What is the staining substance that binds to the DNA and make them visible in gel electrophoresis?

Accepted Answer

Ethidium bromide or SYBR Green

Answer

Hematoxylin

Answer

Fluorescein

Answer

Crystal violet

Question 14

What is the principle of separation in gel electrophoresis?

Accepted Answer

DNA fragments move through gel based on their size and charge

Answer

DNA fragments move through gel based on their charge only

Answer

DNA fragments move through gel based on their mass

Answer

DNA fragments move through gel based on their size only

Question 15

What is the name of the pocket-like indentations in the gel where the DNA samples are loaded?

Accepted Answer

Wells

Answer

Grooves

Answer

Slots

Answer

Pits

Question 16

What is the name of the substance that makes up the gel matrix?

Accepted Answer

Agarose

Answer

Cellulose

Answer

Polyacrylamide

Answer

Silica

Question 17

What is the difference between gel electrophoresis and capillary electrophoresis?

Accepted Answer

Capillary electrophoresis use an extremely narrow tube to separate the samples while gel electrophoresis use a gel

Answer

Capillary electrophoresis is more precise while gel electrophoresis is less precise

Answer

Capillary electrophoresis is faster while gel electrophoresis is slower

Answer

Capillary electrophoresis uses a different type of gel while gel electrophoresis uses an electric current

Question 18

In gel electrophoresis, the DNA fragments that migrate farthest from the well towards the positive electrode are?

Accepted Answer

The smallest fragments

Answer

The fragments with the most fluorescence

Answer

The fragments of the highest charge

Answer

The largest fragments

Question 19

How does staining the gel with Ethidium Bromide or SYBR Green allow visualization of the DNA fragments?

Accepted Answer

The DNA fragments fluoresce when exposed to UV light

Answer

The DNA fragments become radioactive

Answer

The DNA fragments emit light

Answer

The DNA fragments change color

Question 20

Can gel electrophoresis be used to determine the absolute size of a piece of DNA?

Accepted Answer

No, gel electrophoresis is a relative method

Answer

Yes, gel electrophoresis can give an absolute size of DNA

Answer

It depends on the buffer used

Answer

It depends on the gel type

Question 21

What is the main purpose of PCR?

Accepted Answer

Amplifying a specific region of DNA

Answer

Cutting a specific region of DNA

Answer

Sequencing a specific region of DNA

Answer

Splicing a specific region of DNA

Question 22

What is the enzyme responsible for the synthesis of new DNA strands in PCR?

Accepted Answer

DNA polymerase

Answer

Ligase

Answer

Telomerase

Answer

RNA polymerase

Question 23

What are the three main steps of a PCR reaction?

Accepted Answer

Denaturation, Annealing, Extension

Answer

Digestion, Ligation, Transformation

Answer

Denaturation, Hybridization, Ligation

Answer

Enzymatic reaction, Amplification, Purification

Question 24

What is the function of the primers in a PCR reaction?

Accepted Answer

To provide a starting point for DNA polymerase to initiate synthesis

Answer

To provide energy for the reaction

Answer

To provide a specific sequence recognition site

Answer

To provide a template for the synthesis of new strands

Question 25

How is the specificity of a PCR reaction maintained?

Accepted Answer

By using specific primers that only bind to the targeted region of DNA

Answer

By using a high temperature for denaturation

Answer

By using a high concentration of DNA polymerase

Answer

By using a low temperature for annealing

Question 26

What is the thermal cycler used in PCR?

Accepted Answer

A machine that controls the temperature of the reaction

Answer

A machine that purifies the PCR products

Answer

A machine that amplifies the PCR products

Answer

A machine that sequences the PCR products

Question 27

What is the advantage of using PCR?

Accepted Answer

It allows for the amplification of a specific region of DNA without the need for cloning

Answer

It allows for the study of metabolomics

Answer

It allows for the sequencing of entire genome

Answer

It allows for the analysis of proteins

Question 28

What is the difference between Real-time PCR and end point PCR?

Accepted Answer

Real-time PCR allows continuous monitoring of the amplification while end point PCR analyze the amplified products after the reaction is done.

Answer

Real-time PCR analyzes the amplified product by sequencing while end point PCR use gel electrophoresis

Answer

Real-time PCR uses a different thermal cycler than end point PCR

Answer

Real-time PCR uses different reagents than end point PCR

Question 29

What is the optimal temperature range for most DNA polymerases in PCR?

Accepted Answer

72 °C

Answer

95 °C

Answer

42 °C

Answer

95-105 °C

Question 30

What is the role of deoxynucleoside triphosphates (dNTPs) in a PCR reaction?

Accepted Answer

They serve as the building blocks for the synthesis of new DNA strands

Answer

They function as inhibitors for the reaction

Answer

They function as primers for the reaction

Answer

They provide energy for the reaction

Question 31

How is Sanger sequencing performed?

Accepted Answer

Using a DNA polymerase, a primer and a set of four different chain-terminating dideoxynucleotides (ddNTPs)

Answer

Using Gel electrophoresis

Answer

Using PCR

Answer

Using Restriction enzymes

Question 32

What are the four dideoxy nucleotides used in Sanger sequencing?

Accepted Answer

ddATP, ddCTP, ddGTP and ddTTP

Answer

ddA, ddC, ddG, ddT

Answer

ddCAT, ddCAC, ddGAG, ddAGT

Answer

dA, dC, dG, dT

Question 33

What is the use of running gel electrophoresis in Sanger sequencing?

Accepted Answer

To separate the DNA fragments by size

Answer

To clone the DNA

Answer

To transcribe the DNA

Answer

To amplify the DNA

Question 34

Which of the following is not a step in the Sanger sequencing procedure?

Accepted Answer

Amplification

Answer

Separation by size

Answer

Incorporation of chain-terminating dideoxynucleotides

Answer

Detection

Question 35

What is the role of the DNA polymerase in Sanger sequencing?

Accepted Answer

The DNA polymerase synthesizes a new strand of DNA complementary to the template strand by adding nucleotides to the 3' end of the primer

Answer

To amplify the DNA

Answer

To separate the DNA fragments by size

Answer

To transcribe the DNA

Question 36

What is Sanger sequencing?

Accepted Answer

A method that uses chain termination and dideoxy nucleotides to generate a series of DNA fragments of varying lengths

Answer

A method that uses restriction enzymes to cut DNA

Answer

A method that uses gel electrophoresis to separate DNA fragments by size

Answer

A method that uses PCR to amplify DNA

Question 37

What is the main principle of Sanger sequencing?

Accepted Answer

Determine the order of bases by including chain terminators to the DNA primers, hence when the extension reaches to a chain terminator, it stops

Answer

Amplifying the DNA

Answer

Transcribing the DNA

Answer

Cloning the DNA

Question 38

What are the advantages of Sanger sequencing?

Accepted Answer

High accuracy, can sequence long reads and it has been used for many years

Answer

High cost, low throughput, not able to detect certain types of mutations

Answer

Not efficient, can't sequence long reads, no ability to detect certain types of mutations

Answer

Not precise, unable to detect certain types of mutations

Question 39

What are the limitations of Sanger sequencing?

Accepted Answer

Low throughput, relatively high cost, and less efficient than next-generation sequencing methods

Answer

not a sensitive method

Answer

able to detect all types of mutations, high accuracy

Answer

High precision, efficient, high throughput

Question 40

Which biological macromolecule is sequenced by the Sanger method?

Accepted Answer

DNA

Answer

Carbohydrates

Answer

Proteins

Answer

RNA

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