Tag: structure of protein

Questions Related to structure of protein

Which of the following ions has a regulatory role in internal movements?

biology animal tissue muscle tissue structure of protein muscle tissues

  1. Calcium

  2. Magnesium

  3. Iron

  4. Zinc

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Correct Option: A
Explanation:
  • Sarcoplasmic reticulum is similar to endoplasmic reticulum present in other cells. It is present in sarcoplasm (cytoplasm of the muscle cell) of the muscle fiber (muscle cell).
  • The main function of the Sarcoplasmic reticulum is to store calcium ions (Ca2+).
  • When nerve signal reaches the neuromuscular junction it triggers the release of calcium from sarcoplasmic reticulum which in turn facilitates muscle contraction by binding to troponin. thus causing tropomyosin to shift from the face of the actin filament to which myosin heads need to bind to produce a contraction.
  • Hence Calcium ions have a regulatory role in internal movements.
  • So, the correct answer is 'Calcium'.

All the following are examples of connective tissue except _______________.

biology animal tissue muscle tissue structure of protein muscle tissues

  1. Tendons

  2. Ligaments

  3. Muscle

  4. Adipose tissue

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Correct Option: C
Explanation:

Connective tissue serves a connecting function. It supports and binds other tissues in the body. This tissue typically has cells scattered throughout an extracellular matrix of fibrous proteins and glycoproteins attached to a basement membrane. The primary elements of connective tissue include a ground substance, fibres, and cells. Adipose tissue is a type of specialised connective tissue and the ligaments and the tendons belong to the dense type of connective tissue while the muscle belongs to another class of tissues namely muscle tissue which are different from the connective tissue.
So, the correct answer is 'Muscle'.

A muscle is rich in 

biology animal tissue muscle tissue structure of protein muscle tissues

  1. Fat

  2. Protein

  3. Vitamins

  4. Carbohydrate

Show answer
Correct Option: B
Explanation:

A muscle is rich in protein. The muscle cells contain protein filaments of actin and myosin. Actin is a thin filament and myosin is a thick filament. These protein filaments slide past one another to produce contraction. This results in change in length and shape of the cell.

Thus, the correct answer is 'Protein.'

Movement in body are brought about by?

biology animal tissue muscle tissue structure of protein muscle tissues

  1. Muscular tissue

  2. Epithelial tissue

  3. Bones

  4. Tendon and ligaments

Show answer
Correct Option: A
Explanation:

The main function of the muscular system is movement. Muscles are the only tissue in the body that has the ability to contract and therefore move the other parts of the body & the maintenance of the body posture & body position.

So, the correct option is 'Muscular tissue'.

Contractile proteins are found in_________________.

biology animal tissue muscle tissue structure of protein muscle tissues

  1. Bones

  2. Blood

  3. Muscles

  4. Cartilage

Show answer
Correct Option: C
Explanation:

From all the above options, only muscle has a property of contraction. Muscle possess contractile proteins named, acitn and myosin on myofibrils. Hence, option C is correct. 

Which of the following is an incorrect match of cell junction along with its structure and function?

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

  1. Cell junction - Tight junctions,
    Structure - Tightly bound, leak proof, fibrous protein 'belt' that surrounds cells ,
    Functions - Organizing junction : hold cells together such that material passes through but not between the cells.

  2. Cell junction - Desmosomes
    Structure - Intermediate filaments linked to adjoining cells through cadherins cytoskeleton.
    Functions - Anchoring junction : "buttons" cells together.

  3. Cell junction - Plasmodesmata
    Structure - Six transmembrane connexon proteins creating a "pipe" that connects cells
    Function - Communicating junctions : allow passage of small molecules from cell to cell in a tissue.

  4. Cell junction - Adherens junctions
    Structure - Transmembrane fibrous proteins.
    Functions - Anchoring junction : "roots" extra-cellular matrix to cytoskeleton.

Show answer
Correct Option: C

Which is true of contractile tissue of sphincter?
$1.$ Mesodermal
$2$. Contain stretch receptors
$3$. Rhythmicity
$4$. Indefatigible.

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

  1. All the four

  2. Only $1, 2$ and $3$

  3. Only $1, 2$ and $4$

  4. Only $1, 3$ and $4$

Show answer
Correct Option: B

Muscles of iris and ciliary body originate from

zoology embryonic development in human muscle tissue structure of protein muscle tissues

  1. Ectodoerm

  2. Mesoderm

  3. Endoderm

  4. All of the above

Show answer
Correct Option: B
Explanation:

Muscles of iris and ciliary body are "smooth muscles". Smooth muscle cells arise from undifferentiated mesenchymal cells (embryonic mesoderm). These cells differentiate first into mitotically active cells, myoblasts, which contain a few myofilaments. Myoblasts give rise to the cells which will differentiate into mature smooth muscle cells. Iris is derived from neuroectoderm but the muscles of iris is derived from mesoderm. Thus, the correct option is B.

Sarcosome is a term used for

biology multicellular structure: tissue muscle tissue structure of protein muscle tissues

  1. Mitochondria

  2. Golgi bodies

  3. Ribosomes

  4. Plastids

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Correct Option: A
Explanation:

Since the 1850s cytologists observed some granular structures in the cytoplasm of the living cells. These structures were originally named as sarcomas. The term mitochondrion was introduced by Carl Benda in 1898. The term mitochondrion became the widely used name for this organelle but still the term sarcosome is accepted to denote this organelle present in the muscle. Sarcosome is a large specialized mitochondrion found in a striated muscle fiber.
Thus, the correct answer is the option (A), 'Mitochondria'.

Involuntary muscle fibres are unique of

biology multicellular structure: tissue muscle tissue structure of protein muscle tissues

  1. Diaphragm; eye muscles; intercostal muscle

  2. Urinary bladder; blood vessels

  3. Both A and B

  4. None of the above

Show answer
Correct Option: C
Explanation:

Involuntary muscles are those, which are not under our control. Diaphragm muscles are internal muscle, that divides the thorax and the abdomen and are involuntary. The walls of large organs like stomach, intestines, uterus and urinary bladder are involuntary.
Thus, the correct answer is option (C), 'Both (A) and (B)'.