Tag: locomotion and movement

Questions Related to locomotion and movement

Repetitive muscular activity at moderate levels, such as weight training, can result in

zoology locomotion and movement disorders of musculoskeletal system disorders of muscle and skeleton joints and movements

  1. Denervation atrophy

  2. Mood swings

  3. Muscular hypertrophy

  4. A decline in health

Show answer
Correct Option: C
Explanation:

  • Muscular dystrophy is a collection of muscle-wasting conditions. 
  • A lack of a protein called dystrophin is the main cause of muscular dystrophy.
So, the correct option is 'Muscular dystrophy'.

The important muscle proteins that helps in the movement are 

zoology locomotion and movement contractile protein structure of muscle muscles and their structure

  1. Actin and myosin

  2. Troponin

  3. Tropomyosin

  4. All of the above

Show answer
Correct Option: D
Explanation:
  • Skeletal muscle fiber is made up of two types of filaments. They are thick filament (myosin) and thin filament (actin). Contraction of a muscle fiber takes place by the sliding of the thin filaments over the thick filaments.
  • Myosin (thick) filament is also a polymerized protein. Many monomeric proteins called meromyosins constitute one thick filament. 
  • Each actin (thin) filament is made of two ‘F’ (filamentous) actins helically wound to each other. Each ‘F’ actin is a polymer of monomeric ‘G’ (Globular) actins. Two filaments of another protein, tropomyosin also run close to the ‘F’ actins throughout its length. A complex protein troponin is distributed at regular intervals on the tropomyosin.
  • Hence, the important muscles proteins that help in the movement are actin and myosin, troponin and tropomyosin.
  • So, the correct answer is 'All of the above'.

In resting stage, binding sites for myosin on actin filaments are masked by

zoology locomotion and movement contractile protein structure of muscle muscles and their structure

  1. Troponin

  2. Light meromyosin

  3. Heavy meromyosin

  4. Calcium ions

Show answer
Correct Option: A
Explanation:
  • Skeletal muscle fiber is made up of two types of filaments. They are thick filament (myosin) and thin filament (actin). Contraction of a muscle fiber takes place by the sliding of the thin filaments over the thick filaments.
  • Myosin (thick) filament is also a polymerized protein. Many monomeric proteins called meromyosins constitute one thick filament. 
  • Each actin (thin) filament is made of two ‘F’ (filamentous) actins helically wound to each other. Each ‘F’ actin is a polymer of monomeric ‘G’ (Globular) actins. Two filaments of another protein, tropomyosin also run close to the ‘F’ actins throughout its length
  •  In the resting state a subunit of troponin masks the active binding sites for myosin on the actin filaments.
  • So, the correct answer is 'Troponin'.

Thick filaments in muscles are polymerised proteins of

zoology locomotion and movement contractile protein structure of muscle muscles and their structure

  1. Meromyosin

  2. Actin

  3. Troponin

  4. Tropomyosin

  5. Keratin

Show answer
Correct Option: A
Explanation:
  • Myofibrils are composed of two types of filaments i.e thin filament (actin) and thick filament (myosin).
  • Actin filaments are thinner as compared to the myosin filaments, hence are commonly called thin and thick filaments respectively
  • Each myosin (thick) filament is a polymerized protein. Many monomeric proteins called meromyosins constitute one thick filament (Myosin).
  • Hence thick filaments in muscles are polymerized proteins of meromyosin.
  • So, the correct answer is 'Meromyosin'.

 The thin filaments of myofibril contain  __(A)_ actin and two filaments of (B) protein along with  (C)_  protein for masking binding site for myosin. 

zoology locomotion and movement contractile protein structure of muscle muscles and their structure

  1. A - 1F B - troponin C - Tropomyosin

  2. A - 1F B - tropomyosin C - troponin

  3. A - 2F B - troponin C - tropomyosin

  4. A - 2F B - tropomyosin C - troponin

Show answer
Correct Option: A
Explanation:

Thin filaments of myofibril contain one filament of actin and two filaments of troponin, along with tropomyosin protein.

So, the correct option is 'A - 1F B - troponin C - Tropomyosin'.

ATPase activity in muscle fibre lies with

zoology locomotion and movement contractile protein structure of muscle muscles and their structure

  1. Light meromyosin

  2. Head of heavy meromyosin

  3. Troponin

  4. Short arm of heavy meromyosin

Show answer
Correct Option: B
Explanation:
  • The myofibril is composed of two types of filaments. They are thick filament(Myosin) and Thin filament(Actin).
  • Increase in Ca++ level leads to the binding of calcium with a subunit of troponin i.e troponin-C on actin filaments and thereby remove the masking of active sites for myosin. Utilizing the energy from ATP hydrolysis, the myosin head now binds to the exposed active sites on actin to form a cross bridge.
  • Each myosin (thick) filament is also a polymerized protein. Many monomeric proteins called Meromyosins constitute one thick filament. Each meromyosin has the globular head which is an active ATPase enzyme and has binding sites for ATP and active sites for actin. Hence ATPase activity in muscle fibre lies with Head of heavy meromyosin.
  • So, the correct answer is 'Head of heavy meromyosin'.

Actin binding sites are located on:

zoology locomotion and movement contractile protein structure of muscle muscles and their structure

  1. troponin

  2. tropomyosin

  3. meromyosin

  4. both (b) and (c)

Show answer
Correct Option: C
Explanation:

Actin belongs to the family of globular multifunctional protein that forms microfilaments in muscle fibers. The associated proteins along with actin found in thin filaments are troponin and tropomyosin.however the binding sites are located in meromyosin.

So, the correct option is 'meromyosin'.

Which of the following proteins is found in the thick filaments of skeletal muscle?

zoology locomotion and movement contractile protein structure of muscle muscles and their structure

  1. Actin

  2. Troponin

  3. Myosin

  4. Tropomyosin

Show answer
Correct Option: C
Explanation:
A skeletal muscle is made up of different types of proteins. The thick filaments are made up of myosin while the thin filament is made up of three proteins actin, troponin, and tropomyosin. So, the correct answer is 'Myosin'.

Myoglobin is found in?

zoology locomotion and movement contractile protein structure of muscle muscles and their structure

  1. Muscles

  2. Blood

  3. Lungs

  4. RBCs

Show answer
Correct Option: A
Explanation:

  • Myoglobin is a protein found in muscles of almost all mammals that binds to both iron and oxygen. 
  • It is also made up of heme and globin protein. 
  • The main function of myoglobin is binding to oxygen and carrying it to different muscle tissues.
  • So, the correct answer is 'Muscles'.

Read the following statement (A-D) with regards to muscles.


Choose the correct option.

zoology locomotion and movement contractile protein structure of muscle muscles and their structure

  1. I-bands are isotropic bands and made by actin filaments

  2. A-bands are anisotropic bands and made by both actin and myosin filaments

  3. In between I-bands thin fibrous M-line is present

  4. In between A-bands, thin fibrous M-line is present

Show answer
Correct Option: A