Tag: locomotion and movement

Quizzes (9) Questions (98)

Questions Related to locomotion and movement

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

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

  1. Denervation atrophy

  2. Mood swings

  3. Muscular hypertrophy

  4. A decline in health
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.

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

The important muscle proteins that helps in the movement are 

  1. Actin and myosin

  2. Troponin

  3. Tropomyosin

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.
Multiple choice zoology locomotion and movement contractile protein structure of muscle muscles and their structure

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

  1. Troponin

  2. Light meromyosin

  3. Heavy meromyosin

  4. Calcium ions
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.
Multiple choice zoology locomotion and movement contractile protein structure of muscle muscles and their structure

Thick filaments in muscles are polymerised proteins of

  1. Meromyosin

  2. Actin

  3. Troponin

  4. Tropomyosin

  5. Keratin
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.
Multiple choice zoology locomotion and movement contractile protein structure of muscle muscles and their structure

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

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

ATPase activity in muscle fibre lies with

  1. Light meromyosin

  2. Head of heavy meromyosin

  3. Troponin

  4. Short arm of heavy meromyosin
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.
Multiple choice zoology locomotion and movement contractile protein structure of muscle muscles and their structure

Actin binding sites are located on:

  1. troponin

  2. tropomyosin

  3. meromyosin

  4. both (b) and (c)
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.

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

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

  1. Actin

  2. Troponin

  3. Myosin

  4. Tropomyosin
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.
Multiple choice zoology locomotion and movement contractile protein structure of muscle muscles and their structure

Myoglobin is found in?

  1. Muscles

  2. Blood

  3. Lungs

  4. RBCs
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

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


Choose the correct option.

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

I-bands (isotropic) contain only thin actin filaments, which is why they appear lighter under a microscope compared to the A-bands.