Biology Mcqs Test Preparation for ECAT & MCAT - Set 14

1)   Which of the following statement about an arthropod exoskeleton is incorrect?

a. It permits gaseous exchange.
b. It contains joints, for the same purpose as present in human skeletal system.
c. It provides muscle attachment.
d. Like all the other types of exoskeleton, they lack sensation.
Answer  Explanation 

ANSWER: It contains joints, for the same purpose as present in human skeletal system.

Explanation:
No explanation is available for this question!


2)   Ecdysone is

a. An enzyme that digest endocuticle during an arthropodal ecdysis.
b. A newly formed exoskeleton in authropods
c. A hormone that regulates moulting in arthropods.
d. A process that involves moulting.
Answer  Explanation 

ANSWER: A hormone that regulates moulting in arthropods.

Explanation:
No explanation is available for this question!


3)   Endoskeleton is secreted by:

a. Ectoderm.
b. Endoderm.
c. Mesoderm.
d. All of these
Answer  Explanation 

ANSWER: Mesoderm.

Explanation:
No explanation is available for this question!


4)   Collagen fibers of bone are hardened by deposition of:

a. Ca & PO4
b. CaCO3
c. CaSO4
d. SiO2
Answer  Explanation 

ANSWER: Ca & PO4

Explanation:
No explanation is available for this question!


5)   Which one of the following is avascular structure?

a. A compact bone.
b. A spongy bone.
c. Cartilage
d. All of these
Answer  Explanation 

ANSWER: Cartilage

Explanation:
No explanation is available for this question!


6)   Which of the following bone is not present in the hind-limb?

a. Femur
b. Tibia
c. Radius
d. Fibula
Answer  Explanation 

ANSWER: Radius

Explanation:
No explanation is available for this question!


7)   How many bones are present in the wrist?

a. 4 bones
b. 6 bones
c. 8 bones
d. 14 bones
Answer  Explanation 

ANSWER: 8 bones

Explanation:
No explanation is available for this question!


8)   Which of the following bones bones are present in the plam of hand?

a. Carpals
b. Metacarpals
c. Phalanges
d. Metatarsals
Answer  Explanation 

ANSWER: Metacarpals

Explanation:
No explanation is available for this question!


9)   How many vertebrae are present in vertebral column of man?

a. 33 vertebrae
b. 33 pairs of vertebrae
c. 25 vertebrae
d. 31 vertebrae
Answer  Explanation 

ANSWER: 33 vertebrae

Explanation:
No explanation is available for this question!


10)   How many vertebrae are present in coccyx?

a. 7
b. 12
c. 9
d. 4
Answer  Explanation 

ANSWER: 4

Explanation:
No explanation is available for this question!


11)   How many vertebrae are present in the neck or cervical region of man?

a. 7
b. 12
c. 5
d. 4
Answer  Explanation 

ANSWER: 7

Explanation:
No explanation is available for this question!


12)   How many vertebrae are present in thoracic region?

a. 7
b. 12
c. 5
d. 4
Answer  Explanation 

ANSWER: 12

Explanation:
No explanation is available for this question!


13)   How many vertebrae are in sacrum?

a. 7
b. 12
c. 5
d. 4
Answer  Explanation 

ANSWER: 5

Explanation:
No explanation is available for this question!


14)   How many vertebrae are present in lumbar region?

a. 7
b. 12
c. 5
d. 4
Answer  Explanation 

ANSWER: 5

Explanation:
No explanation is available for this question!


15)   Which of the following bones are present in pectoral girdle?

a. Clavicle
b. Scapula
c. Both of these
d. None of these
Answer  Explanation 

ANSWER: Both of these

Explanation:
No explanation is available for this question!


16)   A joint formed between humerus, radius and ulna is an example of

a. Immovable joint.
b. Slightly movable joint.
c. Freely movable joint.
d. Fibrous joint
Answer  Explanation 

ANSWER: Freely movable joint.

Explanation:
No explanation is available for this question!


17)   Joint between two parietal bones, which is infact immovable one is an example of

a. Fibrous joints.
b. Cartilaginous joints.
c. Synovial joints.
d. None of these
Answer  Explanation 

ANSWER: Fibrous joints.

Explanation:
No explanation is available for this question!


18)   Fibrous capsule surrounding synovial joints may be thickened at some places to form:

a. Synovial membrane.
b. Ligaments.
c. Muscles.
d. Tendon
Answer  Explanation 

ANSWER: Ligaments.

Explanation:
No explanation is available for this question!


19)   In which of the following joint muscles are arranged in the same plane as that of joint?

a. Between radius and ulna.
b. Between ulna and scapula
c. Between humerus and scapula
d. Between femur and tibia.
Answer  Explanation 

ANSWER: Between femur and tibia.

Explanation:
No explanation is available for this question!


20)   Which of the following hormone is predominantly responsible for bone weakening in older women?

a. Progesterone.
b. Oestrogen.
c. Parathyroid hormone.
d. Calcitonin.
Answer  Explanation 

ANSWER: Oestrogen.

Explanation:
No explanation is available for this question!


21)   Which of the follwing is a childhood disease resulting from nutritive Ca2+ deficiency:

a. Hypocalcaemia Tatanic spasms.
b. Osteomalacis.
c. Rickets.
d. Tetany
Answer  Explanation 

ANSWER: Rickets.

Explanation:
No explanation is available for this question!


22)   Which of the following statement about osteoporosis is incorrect.

a. It results from estrogen deficiency.
b. Bone eating process takes over bone formation process.
c. There is reduction of bone mass and change in chemical composition of the matrix
d. It is common in old age.
Answer  Explanation 

ANSWER: There is reduction of bone mass and change in chemical composition of the matrix

Explanation:
No explanation is available for this question!


23)   Which of the following statements about fractures in old age is incorrect?

a. They are more common than in adult age.
b. Occur as a result of bone being thin and weak.
c. Due to good blood supply it results in quick healing.
d. It involves osteoblasts and osteocytes.
Answer  Explanation 

ANSWER: Due to good blood supply it results in quick healing.

Explanation:
No explanation is available for this question!


24)   If two ends of fractured bone are opened and kept united via screws and wires drilled in bone substance. This step in fracture repair is called

a. Open reduction.
b. Closed Fixation.
c. Open fixation.
d. Immobilization
Answer  Explanation 

ANSWER: Open reduction.

Explanation:
No explanation is available for this question!


25)   A fracture hematoma has

a. Healing properties.
b. Destructive properties.
c. Neutralizing properties.
d. Dead cells
Answer  Explanation 

ANSWER: Dead cells

Explanation:
No explanation is available for this question!


26)   Which of the following cells are involved in soft callus formation?

a. Fibroblast and osteoblast.
b. Osteoblast and osteoclast.
c. Osteoclast and osteocyte
d. Onteocyte and osteoblast
Answer  Explanation 

ANSWER: Fibroblast and osteoblast.

Explanation:
No explanation is available for this question!


27)   Bony callus formation completes in:

a. 2-3 weeks
b. 3-4 weeks.
c. 2-3 months.
d. 3-4 months.
Answer  Explanation 

ANSWER: 2-3 months.

Explanation:
No explanation is available for this question!


28)   Which of the following is a uni-nucleated cell?

a. A smooth muscle cell.
b. A cardiac muscle cell.
c. A skeletal muscle cell.
d. All of these
Answer  Explanation 

ANSWER: A smooth muscle cell.

Explanation:
No explanation is available for this question!


29)   The contraction of which of the following muscle fibers, is controlled by hormones:

a. A smooth muscle
b. A cardiac muscle
c. A skeletal muscle.
d. All of these
Answer  Explanation 

ANSWER: A smooth muscle

Explanation:
No explanation is available for this question!


30)   Why skeletal muscles are called striated muscles?

a. They appear darker than smooth muscles by naked eye.
b. Alternating dark and light bands appear on their surface when visualized by naked eye.
c. Alternating dark and light bands appear on their surface when visualized via a microscope.
d. All of these
Answer  Explanation 

ANSWER: Alternating dark and light bands appear on their surface when visualized via a microscope.

Explanation:
No explanation is available for this question!


31)   Which of the following statements is incorrect about skeletal muscle fibers?

a. They are multinucleated.
b. They are 10 - 100 ?m in diameter & surrounded by sarcolemma
c. They contain O2 storing molecules called hemoglobin.
d. Their cytoplasm contains high concentration of carbohydrates
Answer  Explanation 

ANSWER: They contain O2 storing molecules called hemoglobin.

Explanation:
No explanation is available for this question!


32)   A smallest contractile unit of muscle contraction called sarcomere is the area between two:

a. H- zone
b. M- Line
c. Z- Line
d. A band
Answer  Explanation 

ANSWER: Z- Line

Explanation:
No explanation is available for this question!


33)   Diameter of thick filament is:

a. 7 nm.
b. 8 nm
c. 16nm
d. 10-100 ?m.
Answer  Explanation 

ANSWER: 16nm

Explanation:
No explanation is available for this question!


34)   The most important function of troponin is

a. To bind with actin
b. To bind with tropomyosin.
c. To bind with Ca2+ ions.
d. All of these
Answer  Explanation 

ANSWER: All of these

Explanation:
No explanation is available for this question!


35)   If a cross section of a sarcomere is seen, each myosin is surrounded by how many actin molecules:

a. 9
b. 5
c. 6
d. 7
Answer  Explanation 

ANSWER: 6

Explanation:
No explanation is available for this question!


36)   What happens during muscle contraction to the length of each myosin and action filament?

a. Z- lines get closer
b. A band becomes short
c. 1 band elongates
d. There is no change in sarcomere
Answer  Explanation 

ANSWER: Z- lines get closer

Explanation:
No explanation is available for this question!


37)   Which of the following step occurs immediately after binding of Ca2+ with troponin molecule during muscle contraction.

a. Binding sites of actin get attached to the myosin head.
b. Troponin uncovers the actin binding sites.
c. Tropomyosin gets removed from the binding sites of actin filaments.
d. Ca2+ goes back inside sarcoplasmic reticulum.
Answer  Explanation 

ANSWER: Tropomyosin gets removed from the binding sites of actin filaments.

Explanation:
No explanation is available for this question!


38)   Rigor mortis i.e, stiffening of body after death results from:

a. Accunulation of rigid proteins molecules in sarcoplam.
b. Unavailability of ATP, which is necessary to break the link between actin and myosin.
c. Decrease in body temperature after death.
d. Death of tissue due to unavailability of O2.
Answer  Explanation 

ANSWER: Unavailability of ATP, which is necessary to break the link between actin and myosin.

Explanation:
No explanation is available for this question!


39)   Which of the following statement about fatigue is correct?

a. The major event in it is accumulation of lactic acid.
b. Lactic acid accumulation turns pH in acidic range leading to muscle ache.
c. Ionic imbalance may also cause it.
d. All of these
Answer  Explanation 

ANSWER: All of these

Explanation:
No explanation is available for this question!


40)   Tetany is caused by

a. Hypocalcemia
b. Hypercalcemia
c. Clostridum tetani.
d. Low O2 level
Answer  Explanation 

ANSWER: Hypocalcemia

Explanation:
No explanation is available for this question!


41)   Which one of the following is an example of a non-elastic connective tissue?

a. Ligaments.
b. Tendon
c. Muscles.
d. None of these
Answer  Explanation 

ANSWER: Tendon

Explanation:
No explanation is available for this question!


42)   Which of the following muscle is an antagonistic member of Biceps brachii?

a. Bracheoradialis
b. Brachialis.
c. Intercostals
d. Triceps
Answer  Explanation 

ANSWER: Triceps

Explanation:
No explanation is available for this question!


43)   Insertion of Biceps is on

a. Ulna
b. Radius
c. Olecronon process of ulna.
d. Scapula
Answer  Explanation 

ANSWER: Radius

Explanation:
No explanation is available for this question!


44)   Which of the following statement is incorrect regarding the locomotion in Euglena?

a. Move with the help of flagellum, attached to the anterior pole of the body.
b. Flagellum whipping backwards moving the organism forward, and when moves forward the organism moves backward.
c. Myonemes can change the direction of the body by making it to shorten from anterior to the posterior pole.
d. None of these
Answer  Explanation 

ANSWER: Flagellum whipping backwards moving the organism forward, and when moves forward the organism moves backward.

Explanation:
No explanation is available for this question!


45)   Which of the following animal uses Setae and Muscles for their Iocomotion?

a. Cockroach
b. Snail
c. Earthworm
d. Star fish
Answer  Explanation 

ANSWER: Earthworm

Explanation:
No explanation is available for this question!


46)   Which of the following vertebrates have a fish-like body?

a. Reptiles
b. Aves
c. Amphibians
d. Mammals.
Answer  Explanation 

ANSWER: Amphibians

Explanation:
No explanation is available for this question!


47)   Which of the following pairs of fins in a fish body are paired?

a. Dorsal and ventral.
b. Pectoral and Pelvic.
c. Tail and anal
d. All of these
Answer  Explanation 

ANSWER: Pectoral and Pelvic.

Explanation:
No explanation is available for this question!


48)   Among the following organisms which shows the best adaptations for locomotion?

a. Amoeba.
b. Earthworm.
c. Reptiles
d. Amphibians.
Answer  Explanation 

ANSWER: Reptiles

Explanation:
No explanation is available for this question!


49)   Which of the following is the swiftest form of the locomotion?

a. Plantigrade
b. Digitigrade
c. Unguligrade
d. Hopping
Answer  Explanation 

ANSWER: Unguligrade

Explanation:
No explanation is available for this question!


50)   S-band locomotion is characteristically seen in:

a. Bony fish
b. Cartilaginous fish.
c. Fish like mammals.
d. All fishes.
Answer  Explanation 

ANSWER: Cartilaginous fish.

Explanation:
No explanation is available for this question!