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What is a hydrogen bond?

A hydrogen bond is a weak electrostatic attraction between a hydrogen atom, which is covalently bonded to an electronegative atom, and another electronegative atom with a lone pair of electrons.

Where are hydrogen bonds found in water?

Hydrogen bonds are found between the hydrogen atoms of one water molecule and the oxygen atom of another water molecule.

Where are hydrogen bonds found in DNA?

Hydrogen bonds are found between the complementary nitrogenous bases of DNA strands.

What is the structure of an amino acid?

An amino acid has a central carbon atom bonded to an amino group (NH₂), a carboxyl group (COOH), a hydrogen atom, and a variable R group.

What are the three options for the R group in amino acids?

Nonpolar (hydrophobic), Polar (hydrophilic), Charged (acidic or basic).

What are three properties of water?

High heat capacity, Cohesion, Adhesion.

Why is water considered a polar molecule?

Water is considered polar because of its bent shape and the electronegativity difference between oxygen and hydrogen, creating a dipole.

How does water move up a capillary tube to move from roots to leaves in a plant?

Water moves up a capillary tube due to cohesion (water molecules sticking together via hydrogen bonds) and adhesion (water molecules sticking to the walls of the tube).

How can a water strider walk on water?

A water strider can walk on water due to the high surface tension of water, which is caused by hydrogen bonding.