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ID: 278545 • Letter: P
Question
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Hi Answer:
9. Phospholipid molecules have
Answer: Option D (Hydrophilic head and two hydrophilic tails)
Explanation: The phospholipids are the major class of lipids which is amphiphilic in nature and form the lipid bilayer. The phospholipids consist of a hydrophilic head consisting of a phosphate group and two hydrophobic tails.
10. The synthesis of maltose, a disaccharide, involves
Answer: Option E (The union of two glucose molecules with the elimination of water)
Explanation: The maltose is a disaccharide formed by the union of two glucose monomer units together. These monomers are joined together by ?(1?4) bond and a molecule of water is eliminated during the joining of these two glucose molecules together.
11. The hydrogen bond
Answer: Option D (creates acidic conditions in a solution)
Explanation: in the above options covalent bonds hold the amino acids together in a polypeptide and there is also a covalent bond which holds hydrogen and oxygen in a water molecule. The twisting of DNA is not due to the hydrogen bonding. The hydrogen bonding can only create the acidic conditions in a solution.
12. Nucleic acids are composed of units called
Answer: Option D (Nucleotides)
Explanation: Nucleotides are the monomer units of nucleic acids. They are made up of a nucleoside linked to the phosphate group. The composition of a nucleotide is sugar+ nitrogenous group+ phosphate group.
13. Which is not one of the four main elements which compose over 95% of living material?
Answer: Option C (Phosphorous)
Explanation: The cells are made up of 4 main content i.e. Carbon, nitrogen, oxygen, and hydrogen.
14. When an atom loses [an] electron[s], it becomes a [n]
Answer: Option B (positive ion)
Explanation: On losing of electron an atom got a positive charge and it is known as a cation.
15. An antidote for drinking methanol or antifreeze is often
Answer: Option A (Ethanol, which blocks the active site on needed enzyme)
Explanation: ethanol can be used as an antidote to block the ADH-mediated metabolism.
17. The most common energy source for cell activities is
Answer: Option A (The breaking of the high energy bond when ATP is hydrolyzed to ADP)
18. Enzymes
Answer: Option E (All the above)
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