Life at a Molecular Level

What two elements make up water?

• Helium and oxygen
• Hydrogen and oxygen
• helium and carbon
• oxygen and carbon

Tags

NGSS.MS-PS1-1

Attractions between water molecules are called

• Covalent bonds
• Ionic bonds
• Polar bonds
• Hydrogen bonds

A water strider can skate along the top of a pond because:

• covalent bonds result in water cohesion
• hydrogen bonds result in water cohesion (surface tension)
• water striders have adapted to take advantage of water cohesion
• low surface tension of water

What molecule is this

• sucrose
• protein
• glucose
• cellulose

Tags

NGSS.HS-LS1-7

NGSS.HS-LS2-5

What elements make up carbohydrates?

• Carbon, hydrogen, nitrogen, oxygen
• sulfur, carbon, hydrogen
• glucose and fructose
• carbon, hydrogen, oxygen

Which of these bonds are found in chain of carbohydrates?

• Glycosidic Bonds

• Phophodiester Bonds

• Peptide Bonds

• Hydrogen Bonds

Functions of carbohydrates include:

• waterproof covering and insulation

• main energy source; structural component of cell wall

• structural componentof cell wall

• protect organs and store energy

What is the main function of Protein?

• For growth and repair of body cells

• Acts as an energy giving nutrient

• To keep the body warm

• Protect internal organs

What is the NH₂ (nitrogen-containing) group on this amino acid called?

• amino group
• R group
• carboxyl group

Tags

NGSS.HS-LS1-6

How many different amino acids are there?

• 15
• 20
• 25
• 30