Tag: dna structure and replication

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Multiple choice zoology molecular basis of inheritance the search for genetic material dna structure and replication molecular genetics

Gel electyrophoresis is used for

  1. Construction of recombinant DNA by joining with cloning vectors

  2. Isolation of DNA molecule

  3. Cutting of DNA into fragments

  4. Separation of DNA fragments according to their size
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Gel electrophoresis separates DNA fragments based on their size/molecular weight through an agarose or polyacrylamide gel matrix when an electric current is applied, allowing analysis of fragment lengths.

Multiple choice zoology molecular basis of inheritance the search for genetic material dna structure and replication molecular genetics

70S ribosomes, chromatophores and circular DNA are found in 

  1. All eukaryotes

  2. All prokaryotes

  3. Some prokaryotes

  4. Some eukaryotes and some prokaryotes
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

70S ribosomes, chromatophores, and circular DNA are characteristic features of prokaryotes, but they are not found in all prokaryotes. For instance, non-photosynthetic prokaryotes lack chromatophores, making these features present only in some prokaryotes.

Multiple choice zoology molecular basis of inheritance the search for genetic material dna structure and replication molecular genetics

Griffith effect is

  1. DNA transcription

  2. RNA translation

  3. Bacterial transformation

  4. Bacterial transduction
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The Griffith effect refers to the discovery of bacterial transformation, where non-virulent bacteria were converted into virulent ones by a 'transforming principle' from dead virulent bacteria.

Multiple choice zoology molecular basis of inheritance the search for genetic material dna structure and replication molecular genetics

In Streptococcus pneumoniae

  1. Virulent form is smooth

  2. Virulent form is rough

  3. Nonvirulent form is capsulated

  4. All forms are rough
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In Streptococcus pneumoniae, the virulent strain possesses a polysaccharide capsule that makes the colonies appear smooth (S-strain), while the non-virulent strain lacks a capsule and appears rough (R-strain).

Multiple choice zoology molecular basis of inheritance the search for genetic material dna structure and replication molecular genetics

Genetic code determines

  1. Sequence of amino acids in protein chain

  2. Variations

  3. Constancy of morphological traits

  4. Structural pattern
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The genetic code is a set of rules by which information encoded in genetic material is translated into proteins by living cells, specifically determining the sequence of amino acids.