Tag: bio-chemistry

Questions Related to bio-chemistry

Anticodon that aligns with initiator codon is

bio-chemistry biochemical techniques manipulation of dna electrophoresis isolation and separation of dna

  1. 5' - UAC - 3'

  2. 5 - UCA -3'

  3. 3' UAC - 5

  4. 3 CAU 5

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Correct Option: C

Which of the following does not produce sticky ends?

bio-chemistry biochemical techniques manipulation of dna electrophoresis isolation and separation of dna

  1. Sma I

  2. EcoRI

  3. SalI

  4. BamHI

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Correct Option: A

Which one of the following methods requires two genetically variable individuals to produce the progeny?

bio-chemistry biochemical techniques manipulation of dna electrophoresis isolation and separation of dna

  1. Cutting

  2. Layering

  3. Budding

  4. Goatee

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Correct Option: A

Which of the following statements is not correct?

bio-chemistry absorption by roots - the processes involved osmotic relations of plant cells transport across membrane imbibition and its importance

  1. In plant cells, vacuoles are absent.

  2. Vacuole is bounded by a single membrane.

  3. In Amoeba, contractile vacuole is important for excretion.

  4. Flagellum is important for transport of bacteria.

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Correct Option: A

Passage of cell contents out of the cell. Water potential can be calculated as : 

bio-chemistry absorption by roots - the processes involved osmotic relations of plant cells transport across membrane imbibition and its importance

  1. $\pi + WP$

  2. $\Psi + WP $

  3. Osmotic potential + TP

  4. $\pi + TP$

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Correct Option: A
Explanation:

  • Water potential is the energy potential of water compared to pure water in a system when both temperature and pressure are same .
  •  When the contents of the the cell moves out then then the wall pressure or turgour pressure will decrease .
So the correct answer is ' B ' . 

$2\%$ NaCl as compared to $18\%$ glucose solution is

bio-chemistry absorption by roots - the processes involved osmotic relations of plant cells transport across membrane imbibition and its importance

  1. Isoomotic

  2. Hypersmotic

  3. Hypoosmotic

  4. None of the above

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Correct Option: A

When the cell is placed in water, it takes water this is due to?

bio-chemistry absorption by roots - the processes involved osmotic relations of plant cells transport across membrane imbibition and its importance

  1. Osmotic pressure

  2. Suction pressure

  3. Diffusion

  4. Water potential and TP

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Correct Option: A

Red blood cells when placed in a hypotonic solution will ______.This process is known as ______.

bio-chemistry absorption by roots - the processes involved osmotic relations of plant cells transport across membrane imbibition and its importance

  1. Shrink, crenation

  2. Swell up, plasmolysis

  3. Turgid, deplasmolysis

  4. Burst, haemolysis

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Correct Option: A
Explanation:

Crenation is defined as the process by which a blood cell shrinks when it is exposed to a hypotonic solution.

The value of $2, 4$-D is $25$ ppm. How many amount of $2, 4$-D should require for making its $5$ litres, $15$ litres and $25$ litres solutions respectively.

bio-chemistry absorption by roots - the processes involved osmotic relations of plant cells transport across membrane imbibition and its importance

  1. $25$gm, $50$gm, $75$gm

  2. $50$gm, $175$gm, $525$gm

  3. $250$gm, $750$gm, $1250$gm

  4. $125$gm, $375$gm, $625$gm

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Correct Option: D
Explanation:

1 ppm is equal to 1 gm per litre.

25 ppm is equal to 25 gm per litre.
Therefore, 
for 5 litres, amount needed is 5 times 25= 125 gm
for 15 litres, amount needed is 15 times 25= 375 gm
for 25 litres, amount needed is 25 times 25= 625 gm.
So the correct option is D.

Plant cells do not burst in distilled water, because

bio-chemistry absorption by roots - the processes involved osmotic relations of plant cells transport across membrane imbibition and its importance

  1. Cells wall is rigid and do not get overstretched

  2. Cell wall is living

  3. Cell wall is the outer most layer of plant cell

  4. Cell wall is permeable

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Correct Option: A
Explanation:

Cell wall is the outermost, rigid, protective, non living and supportive layer found in all the plant cells. Due to its rigid nature it prevent the cell from bursting. It is not found in animal cells. An animal cell placed in pure water will swell up and burst, because of endosmosis.