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?
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.
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?
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.
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.
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.
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.
AI-generated explanation. Check against your textbook.
Explanation:
During contraction, H-zone disappears as thin and thick filaments overlap. A-band length remains constant (does not widen). I-band shortens as filaments slide inward. Cross-bridge cycling involves myosin hydrolyzing ATP to ADP and Pi. Z-lines (at ends of sarcomeres) are pulled toward the center as actin filaments slide, bringing them inward. Hence A, C, D, E are true, B is false.
🧠 Did You Know?
In slide-filament theory, the sliding of actin filaments over myosin shortens the sarcomere without changing the length of the thick or thin filaments themselves.
💡 NCERT Memory Line:
H-zone disappears; I-band shortens; A-band retains its length; Z-lines move toward each other; ATP is hydrolyzed in the cross-bridge cycle.