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- Question
Which one of the following statements regarding histone proteins is correct?
Options- A. Histones are proteins that are present in mitochondrial membrane
- B. Histones are proteins that are present in nucleus in association with DNA
- C. Histones are proteins associated with lipids in the cytosol
- D. Histones are proteins associated with carbohydrates in the cytosol
- Correct Answer
- Histones are proteins that are present in nucleus in association with DNA
ExplanationHistones are highly alkaline proteins found in eukaryotic cell nucleusthat package and order the DNA into structural units called nucleosomes. They are the chief protein components of chromatin, acting as spools around which DNA winds, and playrole in gene regulation.
- 1. The PCl5 molecule has trigonal bipyramidal structure. Therefore,the hybridization of p orbitals should be
Options- A. sp2
- B. sp3
- C. dsp2
- D. dsp3 Discuss
- 2. Which one of the following cell organelles mainly functions as storehouse of digestive enzymes?
Options- A. Desmosome
- B. Ribosome
- C. Lysosome
- D. Vacuoles Discuss
- 3. The monomer/monomers used for the synthesis of Nylon 6 is/are
Options- A. hexamethylenediamine and adipic acid
- B. caprolactam
- C. urea and formaldehydeD.
- D. phenol and formaldehyde Discuss
- 4. Which of the following pairs is INCORRECT? I. Haematite : Iron II. Pitchblende : Copper III. Monazite : Thorium
Options- A. Only I
- B. Only II
- C. Only I and Only II
- D. Only I and Only III Discuss
- 5. What are isobars?
Options- A. Elements with same atomic number but different mass number
- B. Elements with different atomic number but same mass number
- C. Elements with different atomic number and different mass number
- D. Elements with same atomic number and same mass number Discuss
- 6. Process of gaining electrons is known as _____.
Options- A. oxidation
- B. reduction
- C. radiation
- D. both oxidation and reduction Discuss
- 7. Besides CO2, the other green house gas is
Options- A. CH4
- B. N2
- C. Ar
- D. O2 Discuss
- 8. When Granite rocks get metamorphosed, they form
Options- A. Quartzite
- B. Gneiss
- C. Marble
- D. Slate Discuss
- 9. Which of the following is a commercial source of energy?
Options- A. Agricultural waste
- B. Dried dung
- C. Sun
- D. Natural gas Discuss
- 10. Which one of the following elements is used as a timekeeper in atomic clocks?
Options- A. Potassium
- B. Caesium
- C. Calcium
- D. Magnesium Discuss
Chemistry problems
Search Results
Correct Answer: dsp3
Explanation:
The P atom needs five orbitals to form the five P-Cl bonds. It has a 3s and three 3p orbitals, so it must use one of its 3d orbitals to form the fifth bond. These orbitals are hybridized to form five sp3d orbitals that just happen to point in the right directions to form a trigonal bipyramid.
Correct Answer: Lysosome
Explanation:
Lysosome is found in nearly all types of eukaryotic cells (cells with a clearly defined nucleus) and is responsible for the digestion of macromolecules, old cell parts, and microorganisms. Each lysosome is surrounded by a membrane that maintains an acidic environment within the interior via a proton pump. Lysosomes contain a wide variety of hydrolytic enzymes (acid hydrolases) that break down macromolecules such as nucleic acids, proteins, and polysaccharides. So, they are known as storehouse of digestive enzymes.
Correct Answer: hexamethylenediamine and adipic acid
Explanation:
Nylon is made when the appropriate monomers (the chemical building blocks which make up polymers) are combined to form a long chain via a condensation polymerisation reaction. The monomers for nylon 6-6 are adipic acid and hexamethylene diamine
Correct Answer: Only II
Correct Answer: Elements with different atomic number but same mass number
Correct Answer: reduction
Correct Answer: CH4
Correct Answer: Gneiss
Correct Answer: Natural gas
Correct Answer: Caesium
Explanation:
When exposed to certain frequencies of radiation, such as radio waves, the subatomic particles called electrons that orbit an atom's nucleus will "jump" back and forth between energy states. Clocks based on this jumping within atoms can therefore provide an extremely precise way to count seconds.It is no surprise then that the international standard for the length of one second is based on atoms. Since 1967, the official definition of a second is 9,192,631,770 cycles of the radiation that gets an atom of the element called caesium to vibrate between two energy states.
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