All Free Biology MCQs with Answers
Every Biology question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
19,844 questions · page 816 of 993
- A. Sarcolemma
- B. Plasma membrane
- C. Sarcoplasm
- D. Myofibrils
Explanation: 'Sarco-' literally means "muscle". This prefix is used in terms of normal cell biology to indicate that the term is related to the…
Correct answer: Sarcolemma- A. Myoglobin
- B. Myosin
- C. Actin
- D. Haemoglobin
Explanation: Option A, myoglobin, is a heme-containing protein found in muscles, that binds to oxygen, which it supplies to muscle tissue.
Correct answer: Myosin- A. Smooth muscles
- B. Cardiac muscles
- C. Skeletal muscles
- D. Glandular muscles
Explanation: Functionally, our body has three categories of muscles i.e. Smooth, Cardiac, and Skeletal which are then further classified as voluntary…
Correct answer: Skeletal muscles- A. Cervical
- B. Lumbar
- C. Thoracic
- D. Pelvis
Explanation: The bones of the abdomen are made up of the lumbar spine, the third region of the vertebral column, located in the lower back between the…
Correct answer: Lumbar- A. Voluntary and smooth
- B. Involuntary and smooth
- C. Voluntary and striated
- D. Involuntary and striated
- E. Smooth and striated
Explanation: Muscles attached to the bones are called skeletal muscles. Skeletal muscles are voluntary and striated.
Correct answer: Voluntary and striated- A. 22
- B. 26
- C. 24
- D. 28
Explanation: The human skull is composed of 22 bones. These bones include 14 facial bones (a pair of maxilla, mandible, vomer, nasal, a pair of…
Correct answer: 22- A. 200
- B. 300
- C. 400
- D. 500
- E. 600
Explanation: Most sources state that there are over 600 named skeletal muscles in the human body.
Correct answer: 600- A. Muscles in the front of the thigh are contracting and muscles in the back of the thigh are relaxing
- B. Muscles in the front of the lower leg are contracting and muscles in the back of the lower leg are relaxing
- C. Muscles in the back of the thigh are contracting and muscles in the front of the thigh are relaxing
- D. Muscles in the back of the lower leg are contracting and muscles in the front of the lower leg are relaxing
- E. None of the above
Explanation: In the Knee-Jerk reflex, the leg moves in forward direction (as shown below).
Correct answer: Muscles in the front of the thigh are contracting and muscles in the back of the thigh are relaxing- A. 4
- B. 3
- C. 6
- D. 5
- E. 8
Explanation: There are five metacarpal bones in the palm of the hand as shown below(marked red):
Correct answer: 5- A. Gliding joints
- B. Sliding joints
- C. Partially moveable joints
- D. Fixed joints
- E. Pivot joints
Explanation: The vertebral body joints are gliding joints, designed for weight-bearing.
Correct answer: Sliding joints- A. Protein
- B. Silica
- C. CaCO3
- D. Cuticles
Explanation: While mollusca exoskeleton does indeed contain proteins as well as calcium carbonate(CaC03) they are composed mostly of calcium carbonate…
Correct answer: CaCO3- A. Glandular muscles
- B. Cardiac muscles
- C. Skeletal muscles
- D. Smooth muscles
Explanation: The three muscle types (Cardiac, Smooth, Skeletal) can be further classified into two categories i.e. myogenic and neurogenic.
Correct answer: Cardiac muscles16313. Nutritional deficiency ( vitamin D ) results in softening of the bones. This disease is called?
- A. Rickets
- B. Cleft palates
- C. Microcephaly
- D. Down's syndrome
Explanation: Rickets is a condition that results in weak or soft bones in children. Symptoms include bowed legs, stunted growth, bone pain, large…
Correct answer: Rickets16314. Hinge joint occurs in:
- A. Elbow
- B. Skull
- C. Ankle
- D. Backbone
Explanation: Hinge Joints are a type of joint that functions much like a door hinge: allowing movement only in one plane.
Correct answer: Elbow- A. Ankle
- B. Wrist
- C. Vertebrae
- D. Elbow
- E. All of the above except vertebrae
Explanation: There are six types of freely movable joints. Namely; ball and socket joint, hinge joint, pivot joint, condyloid joint, saddle joint, and…
Correct answer: All of the above except vertebrae- A. Peristalsis
- B. Pinocytosis
- C. Porifera
- D. Protozoa
- E. Pseudopodia
Explanation: The organism moves by means of pseudopodia. That is why option E is the correct option.
Correct answer: Pseudopodia- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: At the elbow joint, ulna and humerus meet and the movement they cause is back and forth movement of forearm.At the shoulder joint, humerus…
Correct answer: Option D- A. Legs
- B. Brain
- C. Spinal cord
- D. Both B and C
Explanation: Option A Legs cannot be the answer as the person's nerve from spinal cord which supplies leg is affected Option B Poliomyelitis does not…
Correct answer: Spinal cord16319. Tendon is made up of:
- A. Yellow fibrous connective tissue
- B. Modified white fibrous tissue
- C. Areolar tissue
- D. Adipose tissue
- E. None to them
Explanation: While fibrous tissue has two forms: cords and sheets. The white fibers run parallel to form cords, called tendons.
Correct answer: Modified white fibrous tissue16320. Scapula is the bone of the:
- A. Skull
- B. Pelvic girdle
- C. Pectoral girdle
- D. Vertebral column
Explanation: The shoulder girdle or pectoral girdle is the set of bones in the appendicular skeleton which connects to the arm on each side.
Correct answer: Pectoral girdle