Tag: structure of protein

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Multiple choice biology animal tissue muscle tissue structure of protein muscle tissues

Which of the following statements is incorrect ?

  1. Smooth muscles are ,found in urinary bladder, alimentary canal and genital

  2. A striated muscle Is a syncylium Le., a multinudeate structure

  3. The cytoplasm of striated muscle is called endoplasm

  4. The plasma membrane and ER of striated muscles are called sarcolemma and sarcoplasmic reticulum respectively
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Smooth muscles are found in the urinary bladder, alimentary canal, and genitals. They are involuntary muscles and have a major role in the transport of substances.
So, the correct answer is ' Smooth muscles are found in urinary bladder, alimentary canal and genital'.
Multiple choice biology animal tissue muscle tissue structure of protein muscle tissues

Which one of the following is correct pairing of a body part and like kind of muscle tissue that moves it ?

  1. Iris Involuntary smooth muscle

  2. Heart wall Involuntary unstriated muscle

  3. Biceps of upper arm smooth muscle fibers

  4. Abdominal wall smooth muscle
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The iris of the eye contains involuntary smooth muscle fibers that control the size of the pupil.

Multiple choice biology animal tissue muscle tissue structure of protein muscle tissues

Select the correct option:

Which one of the following is correct pairing of a body part with the kind of muscle tissue present in it?

  1. Biceps of upper arm- Smooth muscle fibres

  2. Abdominal wall- Voluntary smooth muscle

  3. Iris- Involuntary smooth muscle

  4. Heart wall- Involuntary unstriated muscle
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Involuntary smooth muscles are those muscles that are not under the control of our will and are without any striations (stripes). Iris has involuntary smooth muscle. Biceps of upper arm have  striated muscle fibres and abdominal wall has involuntary smooth muscles. Heart wall has involuntary striated muscle.

Multiple choice zoology tissue level of organisation muscle tissue structure of protein muscle tissues

A human cell which contains a large amount of RER, many golgi bodies and a prominent nucleolus is most likely a

  1. Muscle cell

  2. Secretory cell

  3. Nerve cell

  4. RBC
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A cell with abundant rough endoplasmic reticulum, numerous golgi bodies, and a prominent nucleolus is heavily involved in protein synthesis and secretion, making it a secretory cell.

Multiple choice zoology tissue level of organisation muscle tissue structure of protein muscle tissues

What is sarcomere ?

  1. Part between two H-lines

  2. Part between two A-lines

  3. Part between two I-bands

  4. Part between two Z-lines
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
The sarcomeres are fibrous protein filaments that slide past one another when the muscle contracts or relaxes. It is basically the region between two Z-bands.
So, the correct answer is 'Part between two Z-lines'.
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Multiple choice zoology tissue level of organisation muscle tissue structure of protein muscle tissues

The calcium calmodulin complex is formed during contraction which of the following muscle fibres?

  1. Skeletal muscles fibre

  2. Cardiac muscles fibre

  3. White muscles fibre

  4. Smooth muscles fibre
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Unlike skeletal and cardiac muscles which use troponin to bind calcium, smooth muscles rely on the calcium-calmodulin complex to activate myosin light chain kinase for contraction.