Biology Chromosome and DNA MCQs Chapter 6 Class 12





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Biology Ch 6 Class 12 Chromosomes and DNA

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Which of the following statements correctly describes homologous chromosomes?

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In DNA A.

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What will be the approximate length of a DNA strand having 500 nucleotides?

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In semi-conservative replication

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The phenomenon known as crossing-over occurs during:

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Which statement correctly describes the transcription of DNA?

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Which of the following RNA sequences would be transcribed from the DNA sequence ATGGCTAGGAC?

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DNA has a helical shape with the diameter of

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DNA contains

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Who discovered DNA?

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Which is incorrect?

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Which of the following can be blocked, if one wants to stop translation of mRNA?

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A typical human chromosome contains _________ nucleotides in its DNA

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Which of the following enzymes is used to join DNA fragments?

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Genetic information in the DNA is encoded as:

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Transcription is the process in which an RNA copy of the DNA sequence and coding the gene is produced with the help of an enzyme called:

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Evolutionary relationship among species are reflected in their ________.

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The length of okazaki fragments in eukayotes is

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Which statement is correct?

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Diameter of DNA double helix is:

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Rate of DNA replication by DNA polymerase is

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The biochemical analysis of a sample of DNA shows that 32% of the nitrogenous bases are cytosine. What is the total % of adenine and uracil in RNA transcribed from this DNA?

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Chromosome is made of

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The true E.Coli replicating enzyme is

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What would be the number of nucleotides for a protein molecule of about 142 amino acids?

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Bacteria were grown in a medium containing heavy isotope of nitrogen (N15) for many generations and all their DNA contained many heavy nitrogen only. A bacterium of this type was transferred to normal medium and allowed to duplicate. After two divisions of heavy DNA is likely to be that:

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Central dogma is

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Particular array of chromosomes that an individual processes is called its:

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“Law of independent assortment” states:

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Phenotype is:

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Histones have abundance of amino acids

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The total of all the alleles in a population is called a:

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Which of the following is NOT the part of RNA?

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The chromosomes with equal arms are called:

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Haploid and monoploid numbers of chromosomes of hexaploid wheat are:

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During DNA replication ______ attaches the fragment to the lagging strand.

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The combination of XXY (47) chromosomes results in:

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Part of the amino acid sequences In normal and sickle cell hemoglobin are shown.

Normal haemoglobin

Thr – pro – glu – glu

Sickle cell haemoglobin

thr – pro – val – glu

mRNA codons for these amino acids are

Glutamine (glu) GAA GAG

Threonine (thr) ACU ACC

Proline (pro) CCU CCC

Valine (val) GUA GUG

Which transfer RNA molecule is Involved in the formation of this part of the sickle cell haemoglobin?

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In alkaptonuria

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An anticodon is the sequence of the nitrogenous bases on the:

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Within the chromosomes, each chromatid contains ______ DNA molecule:

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In a typical nucleotide, the nitrogenous base is attached to _______ carbon of pentose sugar.

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The sequence of nucleotides that determines the amino acid sequence of a protein is

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Y chromosome in humans:

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The genotype of a normal male in humans is ______ chromosomes.

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The diploid human chromosome set has:

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A tortion of chromatin that is condensed only during cell division is

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The Meselson and Stahl experiment confirmed that DNA replicates in _____ manner.

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The number of base pairs in a complete helical turn is/are:

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Transfer of genetic material from one cell to another that can alter the genetic makeup of recipient cell is called

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Chromosomes are composed of

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An individual has an additional sex chromosome. Which syndrome does he have?

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A fern has _____ pairs of chromosomes.

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Phenylketonuria is

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Locus is defined as:

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Gene mutations take place in:

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Mutations can occur in:

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What is the effect of enzyme DNA ligase?

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Highly condensed portions of the chromatin are called:

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Genetic code is a ______ code and out of 64 codons, _____ are nonsense codons.

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In Maxam – Gilbert method, DNA threads are:

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The particular array of chromosomes that an individual possesses is called its:

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