A tRNA molecule must :

(1) have a base sequence identical to the codon in the mRNA

(2) be attached to a particular amino acid

(3) bind to the protein to determine its primary structure

(4) All of these

Concept Questions :-

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The inducer of lac operon is :

(1) Beta galactosidase

(2) Galactose

(3) Lactose

(4) Glucose

Concept Questions :-

Gene Regulation:Lac Operon
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The creation of a DNA fingerprint would normally employ all the following techniques except :

(1) Southern blotting

(2) Use of restriction endonucleases

(3) Gel electrophoresis

(4) Western blotting

Concept Questions :-

DNA Fingerprinting
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In eukaryotes which of the following is removed from initially transcribed RNA before it is transported to the cytoplasm for translation ?

(1) Intron

(2) 3' Poly A tail

(3) Ribosome binding site

(4) 5' cap

Concept Questions :-

Transcription: IV
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regulatory domains of most activators interact with

(1) the transcription factor complex

(2) RNA polymerase

(3) repressors

(4) the DNA binding domain

Concept Questions :-

Transcription: IV
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VNTR are useful in DNA profiling because they:

I. Are hypervariable

II. Are inherited

III. Synthesize constitutive enzymes

(1) I, II and III are correct

(2) I and II are correct

(3) I and III are correct

(4) II and III are correct

Concept Questions :-

DNA Fingerprinting
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DNA chemically is less reactive and structurally more stable than RNA. Therefore,

1. DNA has evolved from the RNA

2. RNA can directly code for proteins

3. DNA is the better genetic material than RNA

4. The protein synthesizing machinery has evolved around RNA

Concept Questions :-

DNA vs RNA as Genetic Material
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A transcription unit does not contain:

1. A promoter

2. The structural gene

3. A terminator

4. An operator

Concept Questions :-

Transcription:II
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Regulation of lac operon by repressor is referred to as:

1. Inducible regulation

2. Repressible regulation

3. Negative regulation

4. Positive regulation

Concept Questions :-

Gene Regulation:Lac Operon
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A synthetic mRNA of repeating sequence 5'-CACACACACACACACAC... is used for a cell-free protein synthesizing system like the one used used by Nirenberg. If we assume that protein synthesis can begin without the need for an initiator codon, what product or products would you expect to occur after protein synthesis?

1. one protein, consisting of a single amino acid

2. three proteins, each consisting of a different, single amino acid

3. two proteins, each with an alternating sequence of two different amino acids

4. one protein, with an alternating sequence of two different amino acids

Concept Questions :-

Translation Mechanism
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