Mcat

31/12/2022

https://youtu.be/HQQPQJfE_nU

30/12/2022

MDCAT Biology past MCQs, solution, discussion and basic concepts

MCQs solutions and basic concepts. Lecture on structure of Viruseshttps://youtu.be/W2rby79sOPQDiscovery of viruseshttps://youtu.be/uA9_5C38OHoClassification ...

30/12/2022

MCQs about viruses solution and basic concepts

The Baltimore Classification System is a scheme for classifying viruses based on the type of genome and its replication strategy. The system was developed by...

07/05/2020

is responsible for initiating the impulses which trigger the heartbeat rate.
a) pacemaker
b) pacesetter
c) innovator
d) trendsetter

07/05/2020

the circulatory system of fish is known as
a) open
b) closed
c) single circuit
d) both b and c

07/05/2020

Myocardium of the heart is made up of special type of muscles:
a) smooth muscles
b) skeletal muscles
c) cardiac muscle

03/05/2020

Mcqs fron chapter 17 bio xii

Plants become etiolated if grown in the absence of
A. Water
B. Light
C. Oxygen
D. Nutrients
Ans: B

Circannual rhythms show the periodicity of
A. 24 hrs
B. One week
C. One month
D. 365 days
Ans:D

Which one is selective w**d killer?
A. 2-4 D
B. NAA
C. Ethene
D. GA3
ANS: D

The hormone which causes the bolting of rossette plants is
A. Auxin
B. Gibberellins
C. Cytokinin
D. Abscisic acid
Ans; B

This hormone is released by the plants during physiological stress
A. Auxin
B. Gibberellins
C. Cytokinin
D. Abscisic acid
Ans: D

The main nutritional part of neuron is
A. Soma
B. Neissel's granules
C. Axoplasm
D. Axolemma
Ans: A

Which of these lie in the ridges of finger tipsm
A. Hair end organs
B. Meissenr corpuscles
C. Pascinian corpuscles
D. Neissel's granules
Ans: B

Passage of nerve impulse is associated with increase in the permeability of
A. Ca ions
B. OH ions
C. Na ions
D. K ions
Ans: C

The main neurotransmitter which lies out dide central nervous system is
A. Serotonin
B. Nor epinephrin
C. Acetylcholine
D. Adrenalin
Ans: C

Cerebrospinal fluid resembles the
A. Plasma
B. Blood
C. Water
D. A and B
Ans: A

It is the major coordinating center of brain due to hormone production
A. Thalamus
B. Hypothalamus
C. Cerebellum
D. Medulla
Ans: B

Which one is best developed in birds?
A. Thalamus
B. Hypothalamus
C. Cerebellum
D. Medulla
Ans: C

Certain neurons in pons control
A. Sleep wake cycle
B. Transition between sleep and wakefulness
C. Pleasure
D. Menstrual cycle
Ans:B

Somatic nervous system is the system of
A. Sensory neurons
B. Motor neurons
C. Inter neurons
D. Relay neurons
Ans:B

Over secretion of STH in later age cause
A. Acromegaly
B. Dwarfism
C. Critenism
D. Gigmetism
Ans: A

Congenital deficiency of throxine causes
A. Acromegaly
B. Dwarfism
C. Critenism
D. Gigmetism
Ans: C

Excess thyroxin causes
A. Myxodema
B. Grave disease
C. Addison disease
D. Cushing disease
Ans: B

Deficiency of thyroxin in late age causes
A. Myxodema
B. Grave disease
C. Addison disease
D. Cushing disease
Ans: A

Muscular teyanybia due to under activity of
A. Thyroid
B. Parathyroid
C. Anterior piyuitary
D. Lateral pituitary
Ans: B

Pancreas is under the control of
A. STH and TSH
B. T3 anf T4
C. STH and ACTH
D. TSH and ACTH
ANS: C

WHICH of these is minaralocorticoid?
A. Cortisol
B. Aldosteton
C. Corticosteron
D. B and C
Ans: A

The nature of insulin and glucagon is
A. Protein
B. Amino acid derivative
C. Polypeptides
C. Steroids
Ans: A

Growth hormones and prolactin are secreted by
A. Anterior pituitary
B. Median pituitary
C. Posterior pituitary
D. Parathyroids
E. Throid
Ans: A

All plant behaviour is
A. Innate
B. Learned
C. Instinctive
Ans: A

The diminishing of response due to repeated stimuli vis called
A. Imprinting
B. Habituation
C.operant learning
D. Latent learning
E. Insight learning
Ans; B

The behavior modification involving the application of reasoning to novel situtaion is
A. Imprinting
B. Habituation
C.operant learning
D. Latent learning
E. Insight learning
Ans: E

21/04/2020

Which one causes the downward curving of root
A. Auxin
B. Gibberellin
C. Cytokinin
D. Abscisic acid
Ans: A
Hyponasty is caused by
A. Auxin
B. Gibberellin
C. Cytokinin
D. Abscisic acid
Ans: B
In terrestrial plants the maor mechanical stress is imposed by
A. Water
B. Gravity
C. Wind
D. Temperature
Ans: C
Which of these controls moulting process in arthropods?
A. Nephrine
B. Epinephrine
C. Serotonin
D. Ecdysone
Ans: D
Clavicle connects scapula with
A. Sternum
B. Skull
C. Femur
D. Tibia
Ans: A
Sciatica is characterized by stabbing pain over entire
A. Sciatic nerve
B. Sciatic vien
C. Sciatic artery
D. Sciatic capillary
Ans: A
Contractile units of myofibrils are
A. Triads
B. Sarcotubules
C. T.tubules
D. Sarcomeres
Ans: D
Sarcomere is thw region between two consuective
A. M lines
B. I bands
C. Z lines
D. A bands
Ans: C
How many actin filaments surround a myosin filament?
A. 3
B. 4
C. 5
D. 6
Ans: D
Tropinin is a complex of how many polypeptides
A. 3
B. 4
C. 5
D. 6
Ans: A
When the muscle is at rest, the protein which covers the binding site of actin is
A. Myosin
B. Tropomyosin
C. Troponin
D. Tubulin
Ans: B
During the contraction of muscle, calclim ions bind to
A. Myosin
B. Tropomyosin
C. Troponin
D. Tubulin
Ans: C
T tubules and terminal portion of sarcoplasmic reticulum form
A. Satcotubules
B. T system
C. Triads
D. Sarcomere
Ans: C
At rest, how much of lactic acid breaks down aerobically?
A. 1/5
B. 2/5
C. 3/5
D. 4/5
Ans: A
Low level of calvium in the blood causes
A. Tetany
B. Tetanus
C. Cramp
D. Muscle fatigue
Ans: A
Bravhioradialis causes the uplift of
A. Radius
B. Ulna
C. Humerus
D. Tibia
Ans: A
Euglena changes its shape due to contractile proteins called
A. Sarconemes
B. Myonemes
C. Sarcomeres
D. Telomers
Ans: A
Tetrapods pelvic girdle is united with which region of vertebral column
A. Pelvic region
B. Lumbar region
C. Sacral region
D. Thoracic region
Ans: C

16/04/2020

The skeletal muscles become fatigued because of accumulation of
a. Malic acid
b. pyruvic acid
c. acetic acid
d. none of these

16/04/2020

A cord or strap of dense tissue that connects a muscle to bone is called a:
a. tendon
b. ligament
c. bursa
d. arthritis

16/04/2020

A motor unit is made up of _________________
a. all the muscle fibers within a given muscle
b. a motor neuron and the muscle fibers it innervates
c. all the neurons going into an individual section of the body
d. a fascicle and a nerve

16/04/2020

A skeletal muscle is stimulated to contract when its plasma membrane is excited by a message from a_____________ . This message is received at the neuromuscular junction.
a. sensory neuron
b. motor unit
c. motor neuron
d. sarcoplasm