Biological Molecule RT

strands of DNA are bonded by

• Hydrogen

• Carbon

• Oxygen

• Nitrogen

A DNA strand is directly involved in the synthesis of following except

• Another DNA

• Protein synthesis

• t-RNA molecule

• m-RNA

The similarity between DNA and RNA is that both are

• Double stranded

• Having similar sugars

• Polymers of nucleotides

• Having similar pyrimidines

Starch and cellulose are the compounds consist of many units of

• Amino acids

• Glycerol

• Simple sugars

• Fatty acids

Carbohydrate, protein and lipids, etc, are included along with biomolecules, because:

• These are organic compounds.

• They can be synthesized in laboratory

• These are carbon compounds which are found in living tissues.

• These are calorigenic substances

All of the following are correct about water EXCEPT

• Water is molecule

• There is little attraction between water molecules

• The covalent bonds between oxygen and hydrogen are polar or unbalanced

• The reason that water and lipids do not mix is because water is a polar molecule while lipids are nonpolar

• Water has a relatively high heat of vaporization because of strong intermolecular attractions

Which of the following is a trace element required only in small amounts by most living things?

• Oxygen

• Iron

• Nitrogen

• Hydrogen

Where are hydrogen bonds important for life?

• In ionic substance

• Between water molecules

• Between hydrogen atoms

• All of the above

The most abundant compound in living cells is

• Carbon

• Water

• Hydrogen

• Oxygen

The most immediate source of energy for living cells is generally in the form of

• Lipids

• Proteins

• Vitamins

• Carbohydrates