FSC Biology Book MCQs Chapter 6 Class 12





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Biology Ch 6 Class 12 Chromosomes and DNA

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

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Which of the following is NOT the part of RNA?

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DNA has a helical shape with the diameter of

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Who discovered DNA?

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Mutations can occur in:

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A fern has _____ pairs of chromosomes.

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Central dogma is

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

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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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What is the effect of enzyme DNA ligase?

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The chromosomes with equal arms are called:

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Phenylketonuria is

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Gene mutations take place in:

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Which is incorrect?

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Which statement correctly describes the transcription of DNA?

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

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Y chromosome in humans:

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

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

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Histones have abundance of amino acids

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The true E.Coli replicating enzyme is

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DNA contains

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Haploid and monoploid numbers of chromosomes of hexaploid wheat are:

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Chromosomes are composed of

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

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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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A typical human chromosome contains _________ nucleotides in its DNA

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Which statement is correct?

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The diploid human chromosome set has:

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In semi-conservative replication

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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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Highly condensed portions of the chromatin are called:

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

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

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Genetic information in the DNA is encoded as:

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Locus is defined as:

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

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The phenomenon known as crossing-over occurs during:

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Evolutionary relationship among species are reflected in their ________.

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Rate of DNA replication by DNA polymerase is

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In alkaptonuria

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

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

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Which of the following statements correctly describes homologous chromosomes?

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

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

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

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In DNA A.

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Diameter of DNA double helix is:

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Phenotype is:

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“Law of independent assortment” states:

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

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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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Chromosome is made of

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In Maxam – Gilbert method, DNA threads are:

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

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Within the chromosomes, each chromatid contains ______ DNA molecule:

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The length of okazaki fragments in eukayotes is

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

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