If a cross section of a sarcomere is seen, each myosin is surrounded by how many actin molecules:

Related Mcqs:

1. Actin and myosin are the basic proteins involved in contractile machinery of our body to which type of proteins do they belong____________?

   A. Globular proteins
   B. Fibrous Proteins
   C. Both a and b
   D. None of these

2. Detachment of myosin head and actin in rigor mortis occurs due to__________?

   A. stored ATP in body
   B. hypercalcemia
   C. autolysis in body
   D. hyperactivity of mitochondria

   Submitted by: Maryam Aftab

3. A smallest contractile unit of muscle contraction called sarcomere is the area between two:

   A. H- zone
   B. M- Line
   C. Z- Line
   D. A band

4. Breakdown of large molecules into smaller ones utilizing water molecules is_________?

   A. Hydration
   B. Hydrolysis
   C. Dehydration synthesis
   D. Electrolysis

5. What happens during muscle contraction to the length of each myosin and action filament?

   A. Z- lines get closer
   B. A band becomes short
   C. 1 band elongates
   D. There is no change in sarcomere

6. Anus is surrounded by _____ types of muscles?

   A. 2
   B. 3
   C. 1
   D. 4

7. Vacuoles are fluid filled sacs surrounded by a membrane called__________?

   A. tonoplast
   B. nuclear membrane
   C. cell membrane
   D. cell wall

   Submitted by: Muhammad Nawaz

8. It is stiff rod of special cells surrounded by connecive tissue present in the mid -dorsal region and appears in the embryos of all chordates

   A. Placenta
   B. Notochord
   C. Cranianta
   D. Ligule

9. The unicellular organisms ingest large molecules into their cytoplasm from the external environment without previously digesting them. This process is called___________?

   A. Diffusion
   B. Osmosis
   C. Phagocytosis
   D. Plasmolysis

10. Photosystem II has molecules which absorbs maximum light of___________?

    A. 680 nm
    B. 100 m
    C. 700 nm
    D. 670 nm