All Free Biology MCQs with Answers

• A. Myofilaments
• B. Myofibrils
• C. Sarcolemma
• D. Muscle Fibers

Explanation: Muscle fibers are long cells, which combine to coordinate movement of different parts of the body.

• A. Sarcomere
• B. Sarcolemma
• C. Sarcoplasm
• D. Muscle Fiber

Explanation: Sarcomeres are the basic unit of muscle tissue, and are present between two z-lines in a muscle.

• A. Myosin
• B. Actin
• C. Tropomyosin
• D. Troponin

Explanation: Calcium ions which are released bond to troponin, which in turn allows the tropomyosin to give way, thus allowing the muscle to stay…

• A. Tetany
• B. Muscle Fatigue
• C. Cramp
• D. Tetanus

Explanation: As the muscles keep working constantly, they run out of oxygen, which leads to them respiring anaerobically, which in turn causes lactic…

• A. Cervical
• B. Thoracic
• C. Lumber
• D. Sacrum

Explanation: There are 7 cervical vertebrae in the human neck.

• A. Elastic cartilage
• B. Chondral cartilage
• C. Fibrous Cartilage
• D. Hyaline Cartilage

Explanation: A translucent bluish-white type of cartilage present in the joints, the respiratory tract, and the immature skeleton is known as hyaline…

• A. Sarcomere
• B. Sarcolemma
• C. Zyomere
• D. Cross bridges

Explanation: A sarcomere is the basic functional unit of a muscle. It is the repeating unit within myofibrils, which are thread-like structures found…

• A. Myosin
• B. Actin
• C. Troponin
• D. Tropomyosin

Explanation: Ca2+ ions attach to troponin during muscle fiber contraction. Troponin is a regulatory protein complex found on the actin filaments in…

• A. In the mid of A band
• B. In I band
• C. Besides the Z line
• D. Along the I band

Explanation: The H zone appears as a lighter band bisecting the A-band at the center of a sarcomere.

• A. Atlas
• B. Sacral
• C. Thoracic
• D. Axis

Explanation: The first vertebra of the cervical region is known as the atlas. It supports the skull and allows for nodding movements of the head.

• A. Tendon
• B. Ligament
• C. Clavicle
• D. Sternum

Explanation: Tendon is a tough, fibrous, cord-like tissue that connects muscle to bone or another structure, such as an eyeball.

• A. Back bone
• B. Skull
• C. Pelvic girdle
• D. Pectoral girdle

Explanation: A pectoral girdle, also referred to as the shoulder girdle, connects your upper limbs to the bones along the axis of your body.

• A. Atlas
• B. Axis
• C. Neck vertebra
• D. Floating rib

Explanation: The cervical spine (neck region) consists of seven bones (C1-C7 vertebrae), which are separated from one another by intervertebral discs.

• A. I band
• B. A band
• C. M band
• D. Z band

Explanation: The myosin and actin filaments overlap in peripheral regions of the A band, whereas a middle region (called the H zone) contains only…

• A. Lupus
• B. Scleroderma
• C. Ankylosis spondylotis
• D. Juvenile dermatomyositis

Explanation: An autoimmune disorder in which stiffness and inflammation of vertebrae occur is called Ankylosis spondylitis.

• A. Respiratory system
• B. Nervous system
• C. Circulatory system
• D. Bones and muscles

Explanation: Tetanus is an infection of the nervous system with the potentially deadly bacteria Clostridium tetani.

• A. Cervical vertebrae -7
• B. Floating ribs in human - 3
• C. Auditory ossicles - 8
• D. Cranium bones - 4

Explanation: There are two pairs of floating ribs, The ossicles are three bones, There are eight cranial bones, The cervical spine is comprised of…

• A. Released from sarcoplasmic reticulum into Sarcoplasm
• B. Forced back from the sarcoplasm to sarcoplasmic reticulum
• C. Further Forced from sarcoplasmic reticulum into sarcoplasm
• D. Neither released more nor forced back but remain constant

Explanation: When muscles relax, the calcium ions are forced / pumped back from the sarcoplasm into the sarcoplasmic reticulum so that the globular…

• A. Frontal, occipital, ethmoid and sphenoid
• B. Frontal, ethmoid, sphenoid and zygomatic
• C. Ethmoid, sphenoid, zygomatic and frontal
• D. Temporal, sphenoid, frontal and ethmoid

Explanation: Skull consists of 8 bones. Unpaired Bones Paired Bones Frontal Parietal Occipital Temporal Sphenoid Ethmoid

• A. Maxilla
• B. Frontal bone
• C. Mandible
• D. Zygomatic

Explanation: Mandible is the only movable portion of the skull