During the process of gene amplification using PCR, if very high temperature is not maintained in the beginning, then which of the following steps of PCR will be affected first?

NEET-2021 Biotechnology-Principles-and-Processes [class-xii ]

• Annealing
• Extension
• Denaturation
• Ligation
Correct Option: C  [ Denaturation ]

Remark:

A specific recognition sequence identified by endonucleases to make cuts at specific positions within the DNA is:

NEET-2021 Biotechnology-Principles-and-Processes [class-xii ]

• Degenerate primer sequence
• Okazaki sequences
• Palindromic Nucleotide sequences
• Poly(A) tail sequences
Correct Option: C  [ Palindromic Nucleotide sequences ]

Remark:

With regard to insulin choose correct options.
A. C-peptide is not present in mature insulin.
B. The insulin produced by rDNA technology has C-peptide.
C. The pro-insulin has C-peptide.
D. A-peptide and B-peptide of insulin are interconnected by disulphide bridges.
Choose the correct answer from the options given below.

NEET-2021 Biotechnology-and-its-Applications [class-xii ]

• B and D only
• B and C only
• A, C and D only
• A and D only
Correct Option: C  [ A, C and D only ]

Remark:

For effective treatment of the disease, early diagnosis and understanding its pathophysiology is very important. Which of the following molecular diagnostic techniques is very useful for early detection?

NEET-2021 Biotechnology-and-its-Applications [class-xii ]

• Western Blotting Technique
• Southern Blotting Technique
• ELISA Technique
• Hybridization Technique
Correct Option: C  [ ELISA Technique ]

Remark:

Dobson units are used to measure thickness of:

NEET-2021 Environmental-Issues [class-xii ]

• CFCs
• Stratosphere
• Ozone
• Troposphere
Correct Option: C  [ Ozone ]

Remark:

Identify the types of cell junctions that help to stop the leakage of the substances across a tissue and facilitation of communication with neighbouring cells via rapid transfer of ions and molecules.

NEET-2021 Structural-Organisation-in-Animals [class-xi ]

• Gap junctions and Adhering junctions, respectively.
• Tight junctions and Gap junctions, respectively.
• Adhering junctions and Tight junctions, respectively.
• Adhering junctions and Gap junctions, respectively.
Correct Option: B  [ Tight junctions and Gap junctions, respectively. ]

Remark:

Following are the statements about prostomium of earthworm.
A. It serves as a covering for mouth.
B. It helps to open cracks in the soil into which it can crawl.
C. It is one of the sensory structures.
D. It is the first body segment.
Choose the correct answer from the options given below.

NEET-2021 Structural-Organisation-in-Animals [class-xi ]

• A, B and C are correct
• A, B and D are correct
• A, B, C and D are correct
• B and C are correct
Correct Option: A  [ A, B and C are correct ]

Remark:

Following are the statements with reference to 'lipids'.
A. Lipids having only single bonds are called unsaturated fatty acids.
B. Lecithin is a phospholipid.
C. Trihydroxy propane is glycerol.
D. Palmitic acid has 20 carbon atoms including carboxyl carbon.
E. Arachidonic acid has 16 carbon atoms.
Choose the correct answer from the options given below.

NEET-2021 Biomolecules [class-xi ]

• A and B only
• C and D only
• B and C only
• B and E only
Correct Option: C  [ B and C only ]

Remark:

During muscular contraction which of the following events occur?
A. 'H' zone disappears
B. 'A' band widens
C. 'I' band reduces in width
D. Myosine hydrolyzes ATP, releasing the ADP and Pi
E. Z-lines attached to actins are pulled inwards
Choose the correct answer from the options given below.

NEET-2021 Locomotion-and-Movement [class-xi ]

• A, C, D, E only
• A, B, C, D only
• B, C, D, E only
• B, D, E, A only
Correct Option: A  [ A, C, D, E only ]

Remark:

Match List-I with List-II.

NEET-2021 Locomotion-and-Movement [class-xi ]

• A-II, B-III, C-IV, D-I
• A-IV, B-II, C-III, D-I
• A-IV, B-III, C-II, D-I
• A-I, B-III, C-II, D-IV
Correct Option: C  [ A-IV, B-III, C-II, D-I ]

Remark: