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 Multiple Choice QuestionsMultiple Choice Questions

271.

Read the following statements.

I. Satellite DNA is found in the region of euchromatin

II. Prokaryotes contain only non-repetitive DNA

Identify wheather the given statements are true or false

  • Both the statements are true

  • I is true and II is false

  • I is false and II is true

  • Both the statements are false


C.

I is false and II is true

Satellite DNA is a part of eukaryotic DNA that differs in density from most of its DNA as determined by centrifugation, that consists of short repetitive nucleotide sequences. It is found in the region of heterochromatin. It is the region of chromosomes that are permanently coiled up tightly and inert.


272.

Which of the following are not the functions of genes?

I. Cell division

II. Structure and metabolism control

III. Carrier of hereditary information

IV. Provide proof for crossing over

  • I, II, III and IV

  • I, III and IV

  • I, II and III

  • II, III and IV


C.

I, II and III

Gene fucntions are as follows:

(i) Genes are the units of inheritance

(ii) They control the morphology and physiology of individuals.

(iii) Their replication is essential for cell division.

(iv) Reshuffling of genes during sexual reproduction produces variations.


273.

Assertion: The honeybee queen copulates only once in her life time.

Reason: The honeybee queen can lay fertilised as well as unfertilised eggs.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


B.

If both assertion and reason are true but reason is not the correct explanation of assertion.

Queen is the only fertile female in beehive, having immensely developed ovaries. She lives for several successive years laying about 2000 or more eggs a day. The queen has a remarkable capacity of controlling the fertilisation of its eggs. A fertilised egg is laid in a worker or queen cell, while an unfertilised egg in a drone cell, the latter develops parthenogenetically. The queen mates only once in her life time. The sperms stored in her spermatheca fertilise her eggs as long as she lives.


274.

Refer to the given figure and select the correct option regarding its parts labelled as A, B and C.

  • A-Histone octamer, C-DNA

  • B-H1 histone, C-Histone octamer

  • A-H1 histone, B-DNA

  • A-Histone octamer, C-H1 histone


B.

B-H1 histone, C-Histone octamer

The given figure shows nucleosome. Here A is DNA, B is H, histone and C is histone octamer.


275.

Variation in gene frequencies within a population can occur by chance rather than by natural selection. This is referred to as

  • Genetic flow

  • Genetic drift

  • Random mating

  • Genetic load


B.

Genetic drift

Variation in gene frequencies within populations can occur by chance and is called genetic drift.


276.

hnRNA undergoes two additional processes. Out of them in one process an unusual nucleotide (methyl GPT) is added to the 5' end of the molecule. What would you call this?

  • Tailing

  • Splicing

  • Termination

  • Capping


D.

Capping

The process of addition of methyl GPT at the 5' end of hnRNA is known as capping. Enzyme guanly transferase catalyses this process.

Cap is essential for the formation of mRNA- Ribosome complex. Translation is not possible if cap is lacking, because cap is identified by 18 SrRNA of ribosome unity.


277.

Munch hypothesis is based on

  • Translocation of food due to Turgor Pressure (TP) gradient and imbibition force

  • Translocation of food due to Turgor Pressure (TP) gradient

  • Translocation of food due to imbition force

  • None of the above


B.

Translocation of food due to Turgor Pressure (TP) gradient

Munch hypothesis is based on the movement of phloem sap along a turgor pressure gradient. The mass flow of organic solutes takes place from the site of higher concentration, (source) to the site of lower concentration (sink).


278.

Match the triplet codons listed in column I with their amino acids mentioned in column II and select the correct option from the given codes.
          Column I             Column II
        A. GGG                    (i) Proline
        B. UUU                    (ii) Glycine
        C. CCC                    (iii) Arginine
        D. AAA                    (iv) Phenylalanine
                                      (v) Lysine

  • A-(v), B-(iii), C-(i), D-(ii)

  • A-(v), B-(iii), C-(i), D-(iv)

  • A-(ii), B-(iv), C-(i), D-(v)

  • A-(i), B-(ii), C-(iii),D-(iv)


C.

A-(ii), B-(iv), C-(i), D-(v)


279.

Which of the following DNA sequences qualifies to be designated as a palindrome?

  • 5'-GACCAG'3 in one strand

  • 3'GACCAG-5' in one strand

  • 5-GACGAG-3', 3'-CIGGIC-5'

  • 5'-AGCGCT-3', 3'-TCGCGA-5'


D.

5'-AGCGCT-3', 3'-TCGCGA-5'

The palindromic sequence is the sequence of nucleotides whose reading is same when read from both 5'→3' and '3→5' direction. It is the mirror image of the sequence in its first half.

  5'AGC GCT-3'   3'-TCG CGA-5'  


280.

Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statement

  • Both are due to a qualitative defect in globin
    chain synthesis

  • Both are due to a quantitative defect in globin chain synthesis

  • Thalassemia is due to less synthesis of globin molecules

  • Thalassemia is due to less synthesis of globin molecules


C.

Thalassemia is due to less synthesis of globin molecules

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