Actin Molecule

Q.

Which of the following enhances or induces the fusion of protoplasts?

1. Sodium chloride and potassium chloride

2. IAA and gibberellins

3. IAA and kinetin

4. Polyethylene glycol and sodium nitrate

Q.

Match the following.

$\begin{array}{cc}\text{Column I}& \text{Column II}\\ \text{i. Troponin}& \text{a. Blocks the attachment site for the myosin cross bridge}\\ \text{ii. Tropomyosin}& \text{b. Has a myosin binding site}\\ \text{iii. Actin}& \text{c. Complex of 3 polypeptide units}\end{array}$

1. i).→ c ., ii). → b., iii). →a.

2. i). →b., ii). → a., iii). →c.

3. i). → c., ii). → a., iii). →b.

4. i) →a., ii). → c., iii). →b.

Q.

Which of the following is not a component of a thin filament?

1. Actin

2. Myosin

3. Troponin

4. Tropomyosin

Q. Calcium receptive protein of muscles is

1. Tropomyosin
2. Myosin
3. Actin
4. Troponin

Q. In the thin filament of skeletal muscle fiber, a small globular protein that masks the active sites on the actin, is

1. G-actin
2. Actin
3. Tropomyosin
4. Troponin
5. Myosin

Q.

Which one of the following is wrongly matched?

1. Red muscle – Myoglobin

2. Tendon – Connective tissue

3. Troponin – Protein of myosin filament

4. Myosin – Contractile protein