Biology Chapter 12 Entry test MCQs
26. Which one of the following are “myogenie” type of muscles?
a. Cardiac muscles
b. Smooth muscles
c. Glandular muscles
d. Skeletal muscles
Sructure and Ultra-Structure of Skeletal Muscles
27. A Connective tissue wrapping around a muscle that is found continuous with tendons:
a. Epimysium
b. Perimysium
c. Perichondrium
d. Endomysium
28. Sarcoplasmic reticulum is like:
a. Cytoskeletal fibers
b. Golgi bodies
c. Ribosome
d. Smooth endoplasmic reticulum
29. Sarcolemma is primarily made up of:
a. Glycoprotein
b. Lipoprotein
c. Nucleoproteins
d. Glycolipids
30. Which one of the following structures serves as a center of sarcomere?
a. M-line
b. H-Zone
c. A-band
d. Z-band
31. Which one of the following is correct regarding A-band?
a. It is isotropic
b. It is non-polarizing
c. Myosin acts as a polarizer of light
d. It contains only myosin
32. T-tubules in human skeletal muscles are present at:
a. A-l junction
b. Z-line
c. H-zone
d. M-line
33. Diameter of each myofibril is approximately———-.
a. 100 nm
b. 2 μm
c. 100 μm
d. 10 μm
34. Which of the following is a true statement?
a. Muscle cell has many myofibrils
b. Muscle cell has many muscle fibers
c. Sarcomere has bundles of muscle fibers
d. Muscle fiber has many musele cells
35. Which of the following band allows most of the light to pass through it?
a. I-band
b. A-band
c. Muscle fiber
d. Muscle bundle
36. Chief component of thin filaments is:
a. Myosin
b. Actin
c. Fibrous proteins
d. Troponin
37. The sliding protein of muscle:
a. Myosin
b. Tubulin
c. Actin
d. Myoglobin
38. The point of attachment of the nerve to the muscle is called a———–junction.
a. Chemical
b. Neuro-muscular
c. Synaptic
d. Mechanical
39. The repeated protein pattern of myofibrils is called:
a. Zyomere
b. Sarcomere
c. Cross bridges
d. Sarcolemma
40. A sarcomere is the region of a myofibril between two successive:
a. Z-lines
b. M-lines
c. T-tubules
d. I-bands
41. The sarcolemma of muscle fiber folds inwards and forms a system of tubes which runs through the sarcoplasm called:
a. Sarcoplasmic reticulum
b. Myofilaments
c. Transverse tubules
d. Z-lines
42. Each muscle fiber is surrounded by a modified cell membrane called:
a. Sarcomere
b. Sarcolemma
c. Myofilament
d. Myosin Filament
43. Over lapping of thick filament occurs in:
a. I-Band
b. A-Band
c. Z-line
d. M-line
44. Sarcolemma is the membrane around?
a. Muscle fiber
b. Bone
c. Heat
d. Joints
45. Each muscle fiber contains long threads that extend along its entire length. These are called as:
a. Microfilaments
b. Myosin
c. Myofibrils
d. Microtubules
46. The microtubules in the cytoskeleton are made up of protein:
a. Tubulin
b. Tropomyosin
c. Actin
d. Myosin
47. The functional unit of a muscle is known as———–.
a. Sarcoplasm
b. Sarcomere
c. Sarcolemm…
d. Sarcoplasmic reticulum
48. Thin filaments of muscles contain———–chains of actin molecules.
a. One
b. Four
c. Two
d. Three
49. The thick filaments in a myofibril of muscles are made up of———.
a. Myoglobin
b. Haemoglobin
c. Myosin
d. Actin
50. What do we call the cell surface membrane of a muscle fiber?
a. Plasma membrane
b. Sarcolemma
c. Myofibrils
d. Sarcoplasm
outstanding and quality mcqs… Really appreciated