Biology, Chapter 2, Chemistry of Life, Pre Assessment

The attraction among molecules of different substances is called

• cohesion.
• adhesion.
• specific heat.
• surface tension.

What is a compound?

• two atoms of a single element bonded together
• a molecule of two oxygen atoms
• atoms of different elements bonded together in certain ratios
• separate atoms of multiple elements in varying ratios

Tags

NGSS.MS-PS1-1

Fats, oils, and cholesterol are all types of

• cell membranes.
• hormones.
• lipids.
• fatty acids.

Tags

NGSS.MS-LS1-7

Use the graph

• The reaction with the enzyme occurs at a slower rate.
• More energy is released by the original reaction.
• The original reaction is catalyzed.
• Less energy is needed to start the reaction with the enzyme.

Tags

NGSS.HS-PS1-4

Which aspect of a chemical reaction is affected by enzymes?

• equilibrium
• rate
• direction
• pH

Tags

NGSS.HS-PS1-5

An ion is formed when an atom gains or loses

• electrons.
• protons.
• bonds.
• neutrons.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Atoms connected by covalent bonds share

• pairs of electrons.
• hydrogen ions.
• ionic compounds.
• carbon and oxygen.

Why is water necessary to your body?

• It forms the solutes in blood plasma.
• It prevents large changes in blood pH.
• It dissolves nonpolar fats and oils.
• It dissolves and transports substances.

Carbon is unique due to the carbon atom's

• bonding properties.
• ionic compounds.
• hydrogen bonding strength.
• six outer unpaired electrons.

Tags

NGSS.HS-PS1-1

Proteins are composed of which molecules?

• amino acids
• nucleic acids
• fatty acids
• monosaccharides

Tags

NGSS.HS-LS1-6