Multiple Choice QuestionsDark grown Arabidopsis seedlings show ‘triple response’ when exposed to ethylene hormone. Which one of the following options is characteristic of ‘triple response’?
Reduced shoot elongation, increased shoot thickness and tightening of apical hook
Reduced shoot elongation, reduced shoot thickness and loosening of apical hook
Increased shoot elongation, increased shoot thickness and loosening of apical hook
Increased shoot elongation, reduced shoot thickness and tightening of apical hook.
Brassinosteroids are a group of steroid hormones that function in a variety of cellular and developmental contexts in plants. Which one of the following acts as an inhibitor of the brassinosteroid receptor?
BRI 1
BKI 1
BAK 1
BSK 1
Which one of the following metabolites moves from mitochondria to peroxisome during the operation of the C2 oxidative photosynthetic cycle?
Glycerate
Glycolate
Glycine
Serine
Sympathetic post-ganglionic neurons that are cholinergic, innervate ?
Sweat glands
parotid glands
hair follicle
Pancrease
Prestin, a membrane protein, is found in which one of the following cells of the organ of Corti?
Inner hair cells
Inner phalangeal cells
Outer hair cells
Outer phalangeal cells
C.
Outer hair cells
Prestin is a protein, evolved from a family of anion transporters, that is only present in the outer hair cells of mammals. In response to changes in membrane potential, prestin changes conformation within the plasma membrane between long and short forms. Because prestin serves, by itself, as a motor, electromotility is fast—orders of magnitude faster than skeletal muscle contraction. This means that the outer hair cell shortens and lengthens in response to sinusoidal deflection of the hair bundle at physiological frequencies. The shortening and lengthening of the outer hair cell pulls the basilar membrane up and down, thereby amplifying the excursion of the basilar membrane within the organ of Corti. (Fig.) Thus, outer hair cells boost the stimulus that reachethe inner hair cells.
Two individuals A and B, each of 75 kg body weight, have similar volume of body water. Both of them had high salt snack. However, individual A also had a glass of alcoholic drink. Based on this information, which one of the following statements is true?
A will have lower circulating level of antidiuretic hormone (ADH) than B
B will have lower circulating level of ADH than A
The level of ADH will not change in these two individuals
The reabsorption of water in kidney will be more in A than B
An intron was cloned within a transposable element. Absence of the intron following transposition of the element, will indicate that it
follows conservative mode of transposition
follows replicative mode of transposition
is a retrotransposon
is an insertion element
In an organism, allele for red eye colour is dominant over the allele for white eye colour. A cross is made between a white eyed male and a red eyed female. In the progeny, all males are red eyed while the females are white eyed. The reciprocal cross leads to all red eyed progeny. Based on the above information which one of the following conclusions is correct?
This is a sex-limited trait, and the male is the homomorphic sex
This is a sex-linked trait, with male being the homomorphic sex
This is a sex-linked trait, with female being the homomorphic sex
This is a case of autosomal inheritance, with incomplete penetrance
In a sample from a population there were 65 individuals with BB genotype, 30 individuals with Bb genotype and 15 individuals with bb genotype. The frequency of the ‘b’ allele is
0.59
0.27
0.41
0.73
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