Mcat

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Microbiology MCQs and Basic concepts, Bacteria 1

MDCAT Biology past MCQs, solution, discussion and basic concepts

MDCAT Biology MCQs and basic concepts; #BIODIVERSITY #viruses Lecturer #2 MCQs solutions and basic concepts. Lecture on structure of Viruseshttps://youtu.be/W2rby79sOPQDiscovery of viruseshttps://youtu.be/uA9_5C38OHoClassification ...

MCQs about viruses solution and basic concepts

MDCAT-Biology Preparation Lecture #01 - BIODIVERSITY, Virus Classification 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...

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

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

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

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

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

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

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

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

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