Biology Test 22

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Biology Test 22

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Weekly Quiz Competition

Question 1
4 / -1

Yep denotes

A
Yeast episomal plasmid

B
Yeast epidermal plasmid

C
Yeast eukaryotic plasmid

D
Yeast expression plasmid

Solution

The Yeast episomal plasmid (YEP) vectors replicate autonomously because of the presence of a segment of the yeast 2m plasmid that serves as an origin of replication.
Question 2
4 / -1

Hereditary element may be attached to chromosome or found free in cytoplasm is called

A
Microsome

B
Diosome

C
Peroxisome

D
Episome

Solution

Some plasmids integrating into the bacterial DNA chromosomes called episome.
Question 3
4 / -1

Genetic engineering is possible because

A
The phenomenon of transduction in bacteria is not well understood.

B
We can see DNA by electron microscope.

C
We can cut DNA at specific sites by endonucleases like DNAase I

D
Restriction endonucleases purified from bacteria can be used in vitro.

Solution

The process of genetic engineering is possible because transduction in bacteria is well understood. A phenomenon in microorganisms which may serve in genetic engineering is transduction, the process by which virus carries genetic material from one cell to another, causing the second host cell to be changed after incorporating the genetic material into its own genome.

We do not need electron microscope to see DNA.

DNAaseI cut nonspecifically at phospho-diester bond but not at specific sites, so not useful for genetic engineering.
Question 4
4 / -1

Which of the following is false for BT transgenic plant

A
Disease resistance

B
Prepared by Bacillus thuringiensis

C
It is recombinant type

D
No such plant is known

Solution

Bt cotton is a transgenic plant, which have been genetically modified by incorporating foreign and other specific genes through recombinant DNA technology.
Question 5
4 / -1

Enzyme used for cutting DNA at specific site in genetic engineering is

A
Polynucleotide ligase

B
DNA polymerase

C
Restriction endonuclease

D
Helicase

Solution

A restriction enzyme or restriction endonuclease is an enzyme that cuts DNA at or near specific recognition nucleotide sequences known as restriction sites.
Question 6
4 / -1

Retroviruses are implicated as a cause for cancer in humans because they

A
Carry gene for reverse transcriptase.

B
May carry cellular proto-oncogenes in their genome.

C
May carry v-oncogenes in their genome.

D
Carry single stranded RNA as their genetic material.

Solution

The retroviruses contain reverse transcriptase which reverse transcribes viral RNA into proviral DNA. During their normal life cycle, retroviruses integrate proviral DNA into the chromosomal DNA of their host. Integrations occur at many different sites. Most integrations are benign, but some result in cancer.
Question 7
4 / -1

When the region of endoplasmic reticulum are studded by ribosome on their outer surface of the cisternae, it is called

A
Sarcoplasmic reticulum

B
Smooth endoplasmic reticulum

C
Granular endoplasmic reticulum

D
None of the above

Solution

Granular endoplasmic reticulum are the endoplasmic reticulum in which ribosomes are located on the cytoplasmic surface of the cisternae; involved in the synthesis of protein destined to be transported via membrane-bound vesicles to the extracellular space. They are also known as rough endoplasmic reticulum.
Question 8
4 / -1

The main difference between plant and animal cell is

A
Animal cells lack cell wall

B
Plant cell has no cell wall

C
Animal cell has a rigid cell wall

D
Plant cells lack cell membrane

Solution

Presence of the cell wall is the main characteristic of plant cell. It is absent in the animal cell.
Question 9
4 / -1

Which of the following forms more than 1/2 of cell

A
Water

B
Mineral

C
Protein

D
Carbohydrate

Solution

In all living cells water forms 50‑80% of total cell contents.
Question 10
4 / -1

At temperature just below the freezing point, the enzyme

A
Is slightly activated

B
Is destroyed

C
Is inactivated

D
Is unaffected

Solution

Freezing point is the temperature at which a liquid turns into a solid when cooled. At temperature just below the freezing point, the enzyme gets inactivated.

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Re-Attempt Weekly Quiz Competition

Biology Test 22

Result

Biology Test 22

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SHARING IS CARING

Question 1

Yeast episomal plasmid

Yeast epidermal plasmid

Yeast eukaryotic plasmid

Yeast expression plasmid

Solution

Question 2

Microsome

Diosome

Peroxisome

Episome

Solution

Question 3

The phenomenon of transduction in bacteria is not well understood.

We can see DNA by electron microscope.

We can cut DNA at specific sites by endonucleases like DNAase I

Restriction endonucleases purified from bacteria can be used in vitro.

Solution

Question 4

Disease resistance

Prepared by Bacillus thuringiensis

It is recombinant type

No such plant is known

Solution

Question 5

Polynucleotide ligase

DNA polymerase

Restriction endonuclease

Helicase

Solution

Question 6

Carry gene for reverse transcriptase.

May carry cellular proto-oncogenes in their genome.

May carry v-oncogenes in their genome.

Carry single stranded RNA as their genetic material.

Solution

Question 7

Sarcoplasmic reticulum

Smooth endoplasmic reticulum

Granular endoplasmic reticulum

None of the above

Solution

Question 8

Animal cells lack cell wall

Plant cell has no cell wall

Animal cell has a rigid cell wall

Plant cells lack cell membrane

Solution

Question 9

Water

Mineral

Protein

Carbohydrate

Solution

Question 10

Is slightly activated

Is destroyed

Is inactivated

Is unaffected

Solution

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