Recent questions in Biology

Match the items in column I with items in column II:

asked Apr 3, 2014 by sreemathi.v

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Which of the following is used to determine the rate of transpiration in plants?

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Guttation is the process of elimination of water from plants through

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Percentage of water left in the soil when plant wilts is known as

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Wilting in plants occurs when

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Active $K^+$ exchange mechanism for opening and closing of stomata was given by

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Which of the following is most likely cause for wider opening of stomata?

asked Apr 3, 2014 by sreemathi.v

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How many molecules of oxygen gas are used during the glycolysis of one glucose molecule?

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What is the end product of glycolysis?

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Enzymes taking part in glycolysis (EMP pathway) are present in

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Glycolysis is a process found in

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Which of the following is true about fermentation?

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When yeast is producing wine, which of the following is not formed?

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Fumarase enzyme converts

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When a molecule of pyruvic acid is subjected to anaerobic oxidation and forms lactic acid, there is

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How many molecules of ATP are gained during anaerobic respiration of one molecules of glucose?

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In which of the following , respiration in absence of oxygen too takes place?

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In anaerobic respiration in plants

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The end products of respiration in plants are

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Energy yield as a result of total oxidation of 1 glucose molecule during cellular respiration is to convert

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Complete oxidation of $1 \;gm$ mole of glucose gives rise to

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Most promoter sites for RNA polymeraseII have conserved sequence located about 25-35 bp upstream of the transcriptional start site known as

asked Apr 3, 2014 by pady_1

1 answer

In eukaryotic cell, RNA is synthesized by how many RNA polymerases ?

asked Apr 3, 2014 by pady_1

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In which condition, a trp repressor protein is synthesized but doesnt bind to the trp operator and thus trp operon is transcribed to produce enzymes that synthesize tryptophan for the cell ?

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Expand IPTG

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Who proposed the operon model for the regulation of transcription ?

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3 answers

In which condition, the level of intracellular cAMP rises, CRP-cAMP complex is formed that stimulates transcription of the lac operon by using lactose as an alternative carbon source ?

asked Apr 3, 2014 by pady_1

2 answers

IPTG or allolactose in the process of lac operon is used as an

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1 answer

Transcription of the operon is controlled by the lac repressor protein encoded by which gene ?

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1 answer

The lac operon is transcribed by RNA polymerase to produce a ___________.

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$\beta$-galactosidase, galactose permease and thiogalactoside transacetylase are encoded by which of the following lac operon genes respectively?

asked Apr 3, 2014 by pady_1

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DNA replication occurs only in which phase ?

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Which protein helps in preventing the single stranded regions to base pair again, so that each of the two DNA strands is accessible for replication?

asked Apr 3, 2014 by pady_1

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During DNA replication in bacteria, the unwinding of the double helix (using ATP as energy source) is done by

asked Apr 3, 2014 by pady_1

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Which precursor is needed by DNA polymeraseI, during addition of dNTPs (dATP, dGTP, dTTP and dCTP) to the 3' OH end of the DNA chain ?

asked Apr 3, 2014 by pady_1

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E. coli DNA polymerases II and III lack which activity ?

asked Apr 3, 2014 by pady_1

1 answer

The primer used during DNA synthesis, is a short piece of RNA and is synthesized by RNA polymerase called

asked Apr 3, 2014 by pady_1

1 answer

Eukaryotic DNA replication is ________ in nature.

asked Apr 3, 2014 by pady_1

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Nucleosomes are organized into ____ diameter fiber.

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1 answer

Nuclear DNA- protein complex is called

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Histone proteins are _______ in nature.

asked Apr 3, 2014 by pady_1

1 answer

In eukaryotic cell, (a) DNA in chromosomes consist of histone proteins like HU, HSP-1 and H-NS and (b) each chromosome contains a single linear double-stranded DNA molecule.

asked Apr 3, 2014 by pady_1

1 answer

In eukaryotic cell, the DNA is packaged into chromosomes and is present in___________.

asked Apr 3, 2014 by pady_1

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The DNA in a bacterium is a supercoiled double-stranded circular molecule that is packaged in the _______________region of the cell.

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Who worked out the three-dimensional structure of DNA starting from x-ray diffraction photographs taken by franklin and wilkins ?

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The complementary base pairing between the bases A:T & G:C are bonded by which bond ?

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The two DNA strands are organized in ______________ arrangement.

asked Apr 3, 2014 by pady_1

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On the other template strand (that has 5' 3' orientation) DNA polymerase synthesizes short pieces of new DNA in 5' 3' direction and then joins them, these are known as

asked Apr 3, 2014 by pady_1

1 answer

DNA polymerase I also corrects mistakes in DNA by removing mismatched nucleotides, it is known as

asked Apr 3, 2014 by pady_1

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The source of avian reverse transcriptase is

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