1. Which of the following is NOT a key feature of ALL individual cells? a. The a

Question

1. Which of the following is NOT a key feature of ALL individual cells?

   a. The ability to store and transit information using nucleic acids

   b. the presence of a plasma membrane

   c. The ability to harvest and transform energy from the environment

   d. The presence of nucleus

(I choose c and it’s wrong answer)

2. A phosphodiester bond is formed molecule:

   a. A fatty acid and a glycerol molecule

   b. Two amino acids

   c. A 3’ phosphate and a 5’ hydroxyl group

   d. A 5’ phosphate and a 3’ hydroxyl group

3. The class of macro molecules that are not composed of repeating structural units:

   a. Lipids

   b. Carbohydrates

   c. Proteins

   d. Nucleic acids

Explanation / Answer

Answers:-

1. d) The presence of nucleus

Explanation:- Not every cell in the human body has nucleus. For example, mature RBC, cornified cells of skin, hair and nails have no nucleus. Platelets also have no nucleus.

So presence of nucleus is not a key feature of all cells and hence the option d) is correct.

2:- d) A 5' phosphate and 3' hydroxyl group

Explanation:- Phosphodiester bond is a covalent bond formed between 5' phosphate group of one nucleotide and the 3' OH group of another nucleotide in the DNA.

3:- a) Lipids

Explanation:- Lipids are not made up of repeating subunits. Lipids are composed of glycerol and 3 fatty acids.

Proteins are made up of same and repeating units of amino acids.

Carbohydrate is made up of monosaccharide repeating unit. Example is glucose.

Nucleotides are the monomers made up of nucleic acids.

So lipids is the correct answer.

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