Competitive Exams: Botany MCQs (Practice-Test 67 of 104)

  1. Irradiation of a mixture of NH3, CH4, H2 and H2O vapor resulted in the formation of adenine. Such experimental evidence supports Oparin's hypothesis on the origin of life because adenine is found in

    1. ATP

    2. RNA

    3. DNA

    4. ATP, RNA and DNA

  2. In a population. The Hardy-Weinberg equilibrium would NOT prevail in the

    1. Absence of selection

    2. Presence of random mating

    3. Absence of immigration or emigration

    4. Presence of mutation

  3. Adaptive radiation means

    1. Migration of daughter populations to newer localities without losing capacity for exchange of genes with parental populations

    2. Formation of sympatric populations that cannot exchange genes

    3. The ultimate stage in isolation mechanism.

    4. The manifestation of geographical isolation that ultimately leads to reproductive isolation

  4. Copper-containing blue protein found in the chloroplast is the

    1. Plastocyanin

    2. Plastoquinone

    3. Cytochrome f

    4. Ferredoxin

  5. Dermatomes are

    1. Formed during bacterial conjugation

    2. Small vesicles found in pancreatic cells

    3. Synthesized during cell wall formation in plant

    4. Specialized regions of cell membrane for adhesion to other cells in animal tissues

  6. The linker region joining the two nucleosome Particles is about 40 to 60 base pairs long. It contains

    1. His tone H2A and H2B

    2. His tone H1

    3. Two molecules each of his tone H1 and H3

    4. All the five his tones

  7. Feulgen staining for DNA is based on the reactions of Schiff's reagent with

    1. Free aldehyde groups

    2. Purines at N − 7 positions

    3. Deoxyribose at C − 2 positions

    4. Pyrimidines at N − 1 positions

  8. Extrusion or passage of chromatin from one cell into the cytoplasm of the adjoining cell is due to

    1. Cytomixis

    2. Cytokinesis

    3. Inversions

    4. Translocation

  9. Is chromosome refers to the

    1. Chromosome which has been isolated from the rest of the complement

    2. Chromosome which has reached the equatorial plane earlier than the other chromosomes.

    3. Tran located chromosome having identical arms

    4. Lagging chromosome which has not moved to either of the poles

  10. Match List I (Chromosome aberrations) with List II (Consequences) and select the correct a answer using the codes given below the lists:

    List-I List-II
    1. Intercalary deficiency

    2. Duplication

    3. Para centric inversion

    4. Translocation

    1. Chromosome ring formation at metaphase

    2. Bridge and fragment formation

    3. Change in gene order

    4. Two breaks followed by reunion and deletion

    • A
    • B
    • C
    • D
      • 4
      • 3
      • 2
      • 1
      • 4
      • 3
      • 1
      • 2
      • 3
      • 4
      • 1
      • 2
      • 3
      • 4
      • 2
      • 1
  11. Statistical determination of concordance between expectations and observations is done by

    1. t-test

    2. x2-test

    3. F-value

    4. r-value

  12. RNA polymerase II which synthesizes mRNA in eukaryotes is generally

    1. Resistant to aipha-amanitin

    2. Sensitive to aipha-amanitin

    3. Resistant to actinomycin-D

    4. Sensitive to rifamycin

  13. Which of the following pairs is/arc correctly matched?

      • E-coil
      • Circular DNA
      • Tobacco Single
      • Stranded RNA mosaic virus
      • Reo virus
      • Double-stranded RNA

    Select the correct answer using the codes given below:

    Codes:

    1. 1 alone

    2. 1, 2 and 3

    3. 1 and 3

    4. 2 and 3

  14. In specific population of a species, individuals showing 2n + 1 or 2n − 1 set of chromosomes are called respectably

    1. Nullisomics and monosomics

    2. Monosomics and trisomics

    3. Trisomics and monosomics

    4. Nullisomics and trisomics

  15. The modified F2 ratios 15 1, 9 7, 13 3 and 9: 3: 4 indicate

    1. Two pairs of characters controlled by two pairs of genes

    2. Three pairs of characters controlled by three genes

    3. A single charter controlled by. Two genes

    4. A pair of characters controlled by a single gene