All Free Biology MCQs with Answers

• A. Z-line
• B. Actin
• C. Sarcomere
• D. Sarcolemma

Explanation: A sarcomere is the basic contractile unit of a myocyte (muscle fibre). A sarcomere is composed of two main protein filaments (thin actin…

• A. M-line
• B. A-band
• C. Z-line
• D. I-Band

Explanation: The A band is called anisotropic because it does not allow as much light to pass through it and appears darker.

• A. H zone
• B. M-line
• C. Sarcomere
• D. Light band

Explanation: The sarcomere is the contractile unit of muscle fibres. It is the region between two successive z-lines.

• A. Cartilaginous
• B. Synovial
• C. Fibrous
• D. None of these

Explanation: Dentoalveolar joints are a type of fibrous joint that binds teeth to bony sockets in the maxilla (upper jaw) and mandible (lower jaw).

• A. Cardiac - striated - voluntary
• B. Skeletal - striated - voluntary
• C. Cardiac - striated - involuntary
• D. None of these

Explanation: Four characteristics define cardiac muscle cells: they are involuntary, striated, branched, and mononucleated.

• A. A-band
• B. Z-line
• C. H-zone
• D. M-line

Explanation: Z-line is the midline between I bands.H-zone is the lighter strip in the midsection of the A band.M-line bisects the H zone.A-band is…

• A. Myomere
• B. Sarcomere
• C. None of these
• D. Myofibre

Explanation: A sarcomere is the basic contractile unit of muscle fiber. Each sarcomere is composed of two main protein filaments-actin and myosin-which…

• A. Ligament
• B. Joint
• C. None of these
• D. Tendon

Explanation: A joint is a point at which two or more bones meet or where the connection between two bones occur.

• A. Thin
• B. Thick
• C. None of these
• D. Z-line

Explanation: The region of a striated muscle fiber that contains only thick (myosin) filaments.

• A. Bladder
• B. Blood vessels
• C. Intestines
• D. Heart

Explanation: The heart is composed of cardiac muscle fibers.Blood vessels, intestines and bladder all have smooth muscles in their walls that enable…

• A. Hinge joint
• B. Saddle joint
• C. Condyloid joint
• D. None of these

Explanation: The carpometacarpal joints are articulations between the carpal bones and metacarpal bones of the hand.

• A. Juvenile arthritis
• B. Gout
• C. Osteoarthritis
• D. Rheumatoid arthritis

Explanation: Gout is a condition caused by too much uric acid in the body i.e. hyperuricemia.

• A. Intercalated discs
• B. Involuntary
• C. Branching
• D. No distinct nucleus

Explanation: Cardiac muscle is involuntary in nature. It is a striated tissue that is branched and is composed of intercalated discs which contain gap…

• A. Autoimmune
• B. Hormonal
• C. Nutritional
• D. Degenerative

Explanation: Osteoarthritis is the most common form of arthritis. Some people call it a degenerative joint disease or "wear and tear" arthritis.

• A. Styloid process and vertebra
• B. Xiphoid process and vertebra
• C. Xiphoid process and sternum
• D. Styloid process and sternum

Explanation: The xiphisternal joint (or more rarely, the sternoxiphoid joint) is a joint between the inferior margin of the body of the sternum and the…

• A. 3
• B. 6
• C. 5
• D. 4

Explanation: Synovial joints are often further classified by the type of movements they permit.

• A. Middle-sized bones
• B. Muscles
• C. Long bones
• D. Short bones

Explanation: Joints connect bones with bones and syndesmosis is one of the many types of joints present in the human body.

• A. Chemotropic movement
• B. Chemonastic movement
• C. Haptonastic movement
• D. Chemotactic movement

Explanation: As nucleic acid is type of chemical signal for sperms so, that is why this chemical is sensed by sperm to reach ovum, Chemotactic is the…

• A. Hinge joint
• B. Saddle joint
• C. Condyloid joint
• D. Ball and socket joint

Explanation: Metacarpophalangeal joints are the intersection of the metacarpals and the phalanges in the hand. These joints are condyloid joints.

• A. 2
• B. 4
• C. 6
• D. 8

Explanation: Option A: This option is incorrect as well. The number of thin filaments surrounding each thick filament in a sarcomere is greater than…