03-LRQ Biological Molecules

Polar and non-polar bonds are both types of covalent bonds.

Carbon can form both polar and non-polar bonds.

Bonds between carbon and hydrogen are polar.

When carbon forms a bond with oxygen, the electrons spend more time orbiting around the carbon.

Carbon-oxygen bonds are polar.

Polar bonds form when the atoms in the bond have different electronegativities.

Amino groups contain N-H bonds, which are non-polar.

Phosphate groups contain P-O bonds, which are polar.

At cellular pH, phosphate groups and hydroxyl groups are negatively charged and amino groups are positively charged

Which of the following atoms are present in nucleic acids: C, H, O, N, P, S


A. All are present B. C, H, O, N, and P are present C. C, H, O, P are present D. C, H, O, P, and S are present

If you add radioactive sulfur to cells and allow it to be incorporated into molecules synthesized by the cell, you'll find most of the sulfur in



Protein B. DNA C. Carbohydrates D. RNA E. Lipids

Monomers can be joined by hydrogen bonds to form polymers.

If you hydrolyze a polymer, you will release monomers.

Proteins are polymers of A. Lipids B. Deoxynucleotides C. Amino acids D. Sugars E. Nucleotides

Each strand of a DNA double helix is a polymer of


A. Sugars B. Deoxynucleotides C. Nucleotides D. Lipids E. Amino acids