NEET Test 105

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NEET Test 105

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Weekly Quiz Competition

Question 1
4 / -1

Which is the "Only enzyme" that has "Capability" to catalyse Initiation, Elongation and Termination in the process of transcription in prokaryotes?

A
DNase

B
DNA dependent DNA polymerase

C
DNA dependent RNA polymerase

D
DNA Ligase

Solution

In prokaryotes, the DNA dependent RNA polymerase is a holoenzyme that is made of polypeptides (α₂ββ′ω)σ. It is responsible for initiation, elongation and termination during transcription.

DNase degrades DNA.

DNA dependent DNA polymerase is involved in replication of DNA.

DNA ligase joins the discontinuously sysnthesised fragments of DNA.

Hence, the correct option is (C).
Question 2
4 / -1

The reactance of a capacitor of capacitance C is X. If both the frequency and capacitance be doubled, then new reactance will be:

A
X

B
2X

C
4X

D
X / 4

Solution
Question 3
4 / -1

What is the major product in the following reaction sequence:

A

B

C

D

Solution

During trisubstitution, the acetanilide group attached to the benzene ring is more electron donating than the methyl group attached, owing to +M effect, and therefore, the incoming electrophile would prefer ortho w.r.t the acetanilide group.

Hence, the correct option is (A).
Question 4
4 / -1

Equal volumes of the following solutions are mixed. In which of these solutions will precipitation occur?

A
Only (iv)

B
(i) and (ii)

C
(ii), (iii), and (iv)

D
Only (iii)

Solution

When two solutions of equal volumes are mixed, precipitation will occur. The precipitation only occurs when the product is no longer soluble in the solvent. This threshold is given by the K_sp value.
Question 5
4 / -1

Parsec is a unit of :

A
Distance

B
Velocity

C
Time

D
Angle

Solution

Parsec, unit for expressing distances to stars and galaxies, used by professional astronomers. It represents the distance at which the radius of Earth's orbit subtends an angle of one second of arc.

Hence, the correct option is (A).
Question 6
4 / -1

A sample of paramagnetic salt contains 2.0×10²⁴ atomic dipoles each of dipole moment 1.5×10⁻²³JT ^−1. The sample is placed under a homogeneous magnetic field of 0.64T, and cooled to a temperature of 4.2K. The degree of magnetic saturation achieved is equal to 15%. What is the total dipole moment of the sample for a magnetic field of 0.98T and a temperature of 2.8K?

A
3JT ^-1

B
6JT ^-1

C
10JT ^-1

D
12JT ^-1

Solution
Question 7
4 / -1

Paper chromatography is an example of:

A
Adsorption chromatography

B
Partition chromatography

C
Thin-layer chromatography

D
Column chromatography
Question 8
4 / -1

Animal cells after removal of nuclei still contained DNA. The source of this DNA is:

A
Nucleosomes

B
Mitochondria

C
Peroxisomes

D
Lysosome

Solution

Animal cells after removal of nuclei still contained DNA. The source of this DNA is 'Mitochondria'.

Mitochondria are structures within cells that convert the energy from food into a form that cells can use. Although most DNA is packaged in chromosomes within the nucleus, mitochondria also have a small amount of their own DNA. This genetic material is known as mitochondrial DNA or mtDNA. Thus, after the removal of nuclei, the cell still has mtDNA.

Hence, the correct option is (B).

Question 9

4 / -1

Match the columns:

	Column I		Column II
(A)	GEAC	(i)	Eli Lily
(B)	PCR	(ii)	Herbert Boyer
(C)	Insulin	(iii)	In-vitro DNA synthesis
(D)	Antibiotic resistance gene	(iv)	Validity of GM research

(A)-(iv), (B)-(iii), (C)-(i), (D)-(ii)

(A)-(iv), (B)-(iii), (C)-(ii), (D)-(i)

(A)-(iii), (B)-(iv), (C)-(i), (D)-(ii)

(A)-(iii), (B)-(iv), (C)-(ii), (D)-(i)

Solution

Insulin is a hormone that reduces blood glucose and was commercially first produced by the pharmaceutical company Eli Lily.

The Indian Government has set up organizations such as GEAC (Genetic Engineering Approval Committee), which will make decisions regarding the validity of GM research and the safety of introducing GM-organisms for public services.

PCR stands for Polymerase Chain Reaction. In this reaction, multiple copies of the gene (or DNA) of interest is synthesized In-vitro using two sets of primers (small chemically synthesized oligonucleotides that are complementary to the regions of DNA) and the enzyme DNA polymerase.

The construction of the first recombinant DNA emerged from the possibility of linking a gene encoding antibiotic resistance with a native plasmid (autonomously replicating circular extrachromosomal DNA) of Salmonella typhimurium. Stanley Cohen and Herbert Boyer accomplished this in 1972 by isolating the antibiotic resistance gene by cutting out a piece of DNA from a plasmid that was responsible for conferring antibiotic resistance.

Hence, the correct option is (B).

Question 10
4 / -1

A 0.5 m long metal rod PQ completes the circuit as shown in the figure. The area of the circuit is perpendicular to the magnetic field of flux density 0.15 T. If the resistance of the total circuit is 3Ω, calculate the force needed to move the rod in the direction as indicated with a constant speed of 2 m/s.

A
5.78 mN

B
3.75 mN

C
4.95 mN

D
11.23 mN

Solution

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Re-Attempt Weekly Quiz Competition

NEET Test 105

Result

NEET Test 105

Score

-

Rank

-

SHARING IS CARING

Question 1

DNase

DNA dependent DNA polymerase

DNA dependent RNA polymerase

DNA Ligase

Solution

Question 2

X

2X

4X

X / 4

Solution

Question 3

Solution

Question 4

Only (iv)

(i) and (ii)

(ii), (iii), and (iv)

Only (iii)

Solution

Question 5

Distance

Velocity

Time

Angle

Solution

Question 6

3JT -1

6JT -1

10JT -1

12JT -1

Solution

Question 7

Adsorption chromatography

Partition chromatography

Thin-layer chromatography

Column chromatography

Question 8

Nucleosomes

Mitochondria

Peroxisomes

Lysosome

Solution

Question 9

(A)-(iv), (B)-(iii), (C)-(i), (D)-(ii)

(A)-(iv), (B)-(iii), (C)-(ii), (D)-(i)

(A)-(iii), (B)-(iv), (C)-(i), (D)-(ii)

(A)-(iii), (B)-(iv), (C)-(ii), (D)-(i)

Solution

Question 10

5.78 mN

3.75 mN

4.95 mN

11.23 mN

Solution

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3JT ^-1

6JT ^-1

10JT ^-1

12JT ^-1