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E. coli bacteria grew in 15NH4Cl medium for several generations are allowed to grow in 14NH4Cl medium. After 2 generations, the bacteria are isolated from the medium and DNA of bacteria centrifuged in CsCI. The result of the density gradient of DNA is
(1) both heavy and light DNA
(2) only hybrid DNA
(3) both hybrid and light DNA
(4) both hybrid and heavy DNA
(3) both hybrid and light DNA
(3) both hybrid and light DNA
See lessIdentify from the following group of animals, which exhibit oestrous cycle.
(1) Monkey, ape, man and elephant
(2) Lion, deer, dog and cow
(3) Lion, dog, monkey and ape
(4) Cow, monkey, elephant and ape
(2) Lion, deer, dog and cow
(2) Lion, deer, dog and cow
See lessIn a dithecous anther, each pollen sac contain 1000 MMC. What is the total number of pollen-grains produced by the anther?
(1) 16,000
(2) 4,000
(3) 32,000
(4) 8,000
The Correct option is (1) 16,000
The Correct option is (1) 16,000
See lessThe length of latus rectum of the parabola 4y2 + 3x + 3y + 1 = 0 is
(1) 7
(2) 3/4
(3) 4/3
(4) 12
Correct option (2) 3/4Explanation:4y2 + 3y = – 3x – 1LR = |coefficient of x|/coefficient of y2 = 3/4
Correct option (2) 3/4
Explanation:
4y2 + 3y = – 3x – 1
LR = |coefficient of x|/coefficient of y2 = 3/4
See lessAmniocentesis is one of the methods
(1) for foetal sex determination
(2) adapted for MTP
(3) used for safe parturition
(4) of birth control
(1) for foetal sex determination
(1) for foetal sex determination
See lessIn a taxonomic hierarchy, the number of common characters will increase as we go from
(1) Class to Order
(2) Species to Kingdom
(3) Genus to Species
(4) Kingdom to Species
(4) Kingdom to Species
(4) Kingdom to Species
See lessThe value of x if (i + j + k) is a unit vector is
(1) ± 3
(2) ±1/2
(3) ±1/√3
(4) ± 3
Correct option (3) ± 1/√3Explanation:x2 + x2 + x2 = 13x2 = 1x2 = 1/3x = ± 1/√3.
Correct option (3) ± 1/√3
Explanation:
x2 + x2 + x2 = 1
3x2 = 1
x2 = 1/3
x = ± 1/√3.
See lessFind the mis-match from the following pairs:
(1) Natural selection → Industrial melanism
(2) Divergent evolution → thorn of bougainvillia and tendril of cucurbita
(3) Genetic drift → Constant gene frequency
(4) Adaptive radiation → Australian marsupials
(3) Genetic drift → Constant gene frequency
(3) Genetic drift → Constant gene frequency
See lessThe edible part of the fruit of apple is
(1) Endocarp
(2) Thalamus
(3) Involucre
(4) Pericarp
(2) Thalamus
(2) Thalamus
See lessThe component of a vector r along x-axis will have a maximum value if
(1) vector r is along + ve y-axis
(2) vector r makes an angle of 45° with the x-axis
(3) vector r is along +ve x-axis
(4) vector r is along –ve y-axis
Correct option (3) vector r is along +ve x-axis Explanation:rx = r cos θ rx is maximum if θ = 0
Correct option (3) vector r is along +ve x-axis
Explanation:
rx = r cos θ
rx is maximum if θ = 0
See less