Tag: structure of protein

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Questions Related to structure of protein

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

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

  1. Calcium

  2. Magnesium

  3. Iron

  4. Zinc
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.
Multiple choice biology animal tissue muscle tissue structure of protein muscle tissues

All the following are examples of connective tissue except _______________.

  1. Tendons

  2. Ligaments

  3. Muscle

  4. Adipose tissue
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.
Multiple choice biology animal tissue muscle tissue structure of protein muscle tissues

A muscle is rich in 

  1. Fat

  2. Protein

  3. Vitamins

  4. Carbohydrate
Reveal answer Fill a bubble to check yourself
B Correct answer
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.'

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

Movement in body are brought about by?

  1. Muscular tissue

  2. Epithelial tissue

  3. Bones

  4. Tendon and ligaments
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

Contractile proteins are found in_________________.

  1. Bones

  2. Blood

  3. Muscles

  4. Cartilage
Reveal answer Fill a bubble to check yourself
C Correct answer
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. 

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

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

  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.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Plasmodesmata are channels that traverse the cell walls of plant cells and some algal cells, allowing transport and communication between them. They are not made of connexon proteins; connexons are found in gap junctions in animal cells.

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

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

  1. All the four
  2. Only $1, 2$ and $3$
  3. Only $1, 2$ and $4$
  4. Only $1, 3$ and $4$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sphincter muscles are typically smooth muscles (mesodermal), contain stretch receptors to regulate tone, and exhibit rhythmicity in some cases (like the pyloric sphincter). They are generally not indefatigable; like other muscles, they can fatigue.

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

Muscles of iris and ciliary body originate from

  1. Ectodoerm

  2. Mesoderm

  3. Endoderm

  4. All of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Sarcosome is a term used for

  1. Mitochondria

  2. Golgi bodies

  3. Ribosomes

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

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

Involuntary muscle fibres are unique of

  1. Diaphragm; eye muscles; intercostal muscle

  2. Urinary bladder; blood vessels

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
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)'.