B1.1 Lipids Exit Ticket

What is the result of bonding between three fatty acids and a glycerol?

• Palmitic Acid

• Trans Fats

• Triglyceride

• Water

Answer explanation

The bonding of three fatty acids with a glycerol molecule forms a triglyceride. This is a key type of fat found in the body, used for energy storage. Other options like palmitic acid and trans fats are specific types of fatty acids, not the result of this bonding.

Which of the following bonds cannot be found in saturated fats?

• C-C

• H-C

• C=C

• C-O

Answer explanation

Saturated fats contain only single bonds between carbon atoms (C-C) and do not have double bonds (C=C). Therefore, C=C bonds cannot be found in saturated fats, making it the correct answer.

Which of the following bonds can be found in unsaturated fats?

• N-O

• C=C

• H-H

• N-N

Answer explanation

Unsaturated fats contain at least one double bond between carbon atoms, represented as C=C. This is what distinguishes them from saturated fats, which have only single bonds.

Tags

NGSS.HS-LS1-6

All of the following are lipids except __________

• ear wax

• saturated fats

• cholesterol

• starch

Answer explanation

Starch is a carbohydrate, not a lipid. Ear wax, saturated fats, and cholesterol are all types of lipids, while starch serves as an energy storage molecule in plants.

Type of lipid used to make certain hormones

• wax

• steroid

• lipid

• phospholipid

Answer explanation

Steroids are a type of lipid that serve as precursors for certain hormones, such as testosterone and estrogen. Other options like wax and phospholipids do not play this role in hormone production.

• Saturated

• Unsaturated

• saturated

• unsaturated

Tags

NGSS.HS-PS1-2

Which macromolecule is shown?

• lipid

• protein

• nucleic acid

• carbohydrate

Answer explanation

The macromolecule shown is a lipid, characterized by its hydrophobic nature and structure, which typically includes long hydrocarbon chains or rings. This distinguishes it from proteins, nucleic acids, and carbohydrates.

What is the key difference between saturated and unsaturated fats?

• Saturated fats are usually liquid at room temperature; unsaturated fats are usually solid

• Saturated fats stay solid at room temperature; unsaturated fats are usually liquid

• Saturated fats can be found in vegetable oils, unsaturated fats can be found in animal products

• Saturated fats are healthier than unsaturated fats

Answer explanation

The key difference is that saturated fats stay solid at room temperature, while unsaturated fats are usually liquid. This is due to the presence of double bonds in unsaturated fats, which prevent tight packing.

Which of the following is a main function of a lipid?

• source of quick energy

• stores energy, insulates us, and makes up the cell membrane

• transport substances in and out of the cell

• stores genetic information

Answer explanation

Lipid functions include storing energy, providing insulation, and forming cell membranes, making the correct choice "stores energy, insulates us, and makes up the cell membrane." Other options describe functions of carbohydrates or proteins.