12890.In male cockroaches, sperms are stored in which part of the reproductive system?
Vas deferens
Seminal vesicles
Mushroom glands
Testes
12891.Smooth muscles are
voluntary, spindle-shaped, uninucleate
involuntary, fusiform, non-striated
voluntary, multinucleate, cylindrical
involuntary, cylindrical, striated
12892.Oxidative phosphorylation is
formation of ATP by energy released from electrons removed during substrate oxidation
formation of ATP by transfer of phosphate group from a substrate to ADP.
oxidation of phosphate group in ATP
addition of phosphate group to ATP
Explanation:
Oxidative phosphorylation occurs when NADH+ + H+ or FADH2 are oxidized and their electron enters in ETC creating proton gradient which finally produce ATP in F1 -F1 particle.
Oxidative phosphorylation occurs when NADH+ + H+ or FADH2 are oxidized and their electron enters in ETC creating proton gradient which finally produce ATP in F1 -F1 particle.
12893.Which of the following is the least likely to be involved in stabilizing the three-dimensional folding of most proteins?
Ester bonds
Hydrogen bonds
Electrostatic interaction
Hydrophobic interaction
Explanation:
Ester bonds are formed in nucleic acids and lipids, but not proteins.
Ester bonds are formed in nucleic acids and lipids, but not proteins.
12894.Which of the following describes the given graph correctly?
Exothermic reaction with energy A in absence of enzyme and B in presence of enzyme
Endothermic reaction with energy A in presence of enzyme and B in absence of enzyme
Exothermic reaction with energy A in presence of enzyme and B in absence of enzyme
Endothermic reaction with energy A in absence of enzyme and B in presence of enzyme.
Explanation:
When product is at a lower level than substrate, it is an exothermic reaction. In A, the activation energy is reduced due to presence of enzymes.
When product is at a lower level than substrate, it is an exothermic reaction. In A, the activation energy is reduced due to presence of enzymes.
12895.When cell has stalled DNA replication fork, which checkpoint should be predominantly activated?
Both G2 / M and M
G1 / S
G2 / M
M
Explanation:
G2 / M check point ensures that DNA Replication is complete and no error is left.
G2 / M check point ensures that DNA Replication is complete and no error is left.
12896.Match the stages of meiosis in Column-I to their characteristic features in Column-II and select the correct option using the codes given below :
Codes:
a b c d
| Column-I | Column-II |
|---|---|
| a. Pachytene | (i) Pairing of homologous chromosomes |
| b. Metaphase I | (ii) Terminalization of chiasmata |
| c. Diakinesis | (iii) Crossing-over takes place |
| d. Zygotene | (iv) Chromosomes align at equatorial plate |
Codes:
a b c d
(iv) (iii) (ii) (i)
(iii) (iv) (ii) (i)
(i) (iv) (ii) (iii)
(ii) (iv) (iii) (i)
12897.Which hormones do stimulate the production of pancreatic juice and bicarbonate?
Insulin and glucagon
Angiotensin and epinephrine
Gastrin and insulin
Cholecystokinin and secretin
Explanation:
Pancreatic juice rich in enzymes is secreted under influence of cholecystokinin, while pancreatic juice rich in bicarbonates is secreted under influence of secretin.
Pancreatic juice rich in enzymes is secreted under influence of cholecystokinin, while pancreatic juice rich in bicarbonates is secreted under influence of secretin.
12898.The partial pressure of oxygen in the alveoli of the lungs is
less than that of carbon dioxide
equal to that in the blood
more than that in the blood
less than that in the blood
Explanation:
pO2 in Alveoli is 104, while in oxygenated blood, it is 95.
pO2 in Alveoli is 104, while in oxygenated blood, it is 95.
12899.Choose the correct statement.
Receptors do not produce graded potentials.
Nociceptors respond to changes in pressure.
Meissners corpuscles are thermoreceptors.
Photoreceptors in the human eye are depolarized during darkness and become hyperpolarized in response to the light stimulus.
Explanation:
Nocireceptors respond to pain.
Meissner’s corpuscles are tactile receptors.
Receptors produce graded potential that makes membrane potentials less negative and more positive thus creating an action potential due to influx of Na+ ions & efflux of K+ ions.
Nocireceptors respond to pain.
Meissner’s corpuscles are tactile receptors.
Receptors produce graded potential that makes membrane potentials less negative and more positive thus creating an action potential due to influx of Na+ ions & efflux of K+ ions.
12900.Graves disease is caused due to
hypersecretion of adrenal gland
hyposecretion of thyroid gland
hypersecretion of thyroid gland
hyposecretion of adrenal gland
12901.Name the ion responsible for unmasking of active sites for myosin for cross-bridge activity during muscle contraction.
Potassium
Calcium
Magnesium
Sodium
12902.Name the blood cells, whose reduction in number can cause clotting disorder, leading to excessive loss of blood from the body.
Thrombocytes
Erythrocytes
Leucocytes
Neutrophils
12903.Name a peptide hormone which acts mainly on hepatocytes, adipocytes and enhances cellular glucose uptake and utilization.
Gastrin
Insulin
Glucagon
Secretin
12904.Osteoporosis, an age related disease of skeletal system, may occur due to
accumulation of uric acid leading to inflammation of joints
immune disorder affecting neuromuscular junction leading to fatigue
high concentration of Ca++ and Na+
decreased level of estrogen
12905.Serum differs from blood in
lacking antibodies
lacking globulins
lacking albumins
lacking clotting factors
Explanation:
Blood Plasma – clotting factors = Serum
Blood Plasma – clotting factors = Serum
12906.Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because
pressure in the lungs is higher than the atmospheric pressure
there is a negative pressure in the lungs
there is a negative intrapleural pressure pulling at the lung walls
there is a positive intrapleural pressure
Explanation:
There is negative intrapleural pressure pulling at lung walls due to which lungs do not collapse between breaths and thus residual volume of air is always present in lungs.
There is negative intrapleural pressure pulling at lung walls due to which lungs do not collapse between breaths and thus residual volume of air is always present in lungs.
12907.The posterior pituitary gland is not a true endocrine gland because
it secretes enzymes
it is provided with a duct
it only stores and releases hormones
it is under the regulation of hypothalamus
12908.The part of nephron involved in active reabsorption of sodium is
descending limb of Henles loop
distal convoluted tubule
proximal convoluted tubule
Bowmans capsule
12909.Which of the following is hormone-releasing IUD?
Cu7
LNG-20
Multiload 375
Lippes loop
Explanation:
LNG- 20 Levo Nor Gesterol is a hormone releasing IUD - progesterone releasing IUD
Cu7 & multiload 375 is copper releasing IUD
Lippe’s loop is Non- medicated IUD
LNG- 20 Levo Nor Gesterol is a hormone releasing IUD - progesterone releasing IUD
Cu7 & multiload 375 is copper releasing IUD
Lippe’s loop is Non- medicated IUD