Question

macromolecules
for questions 6–8, circle the letter of the correct answer.
6 the characteristic that best defines a macromolecule is its
a size.
b function.
c life cycle.
d chemical makeup.
7 all of the following macromolecules are polymers except
a lipids.
b proteins.
c nucleic acids.
d carbohydrates.
8 all of the following are part of a carbohydrate except
a carbon.
b oxygen.
c hydrogen.
d phosphorus.
9 explain how macromolecules are involved in passing traits from parents to offspring.
water
for questions 10–12, write true if the statement is true. if the statement is false, replace the underlined word to make the statement true. write your changes on the line.
10 water molecules adhere to each other through covalent bonds.
11 its cohesion allows water to transport nutrients and wastes in plants and animals.
12 a solution with a ph less than 7 is basic.
13 how does water resist changes in temperature?
14 why is water called \the universal solvent\?

Explanation:

• Question 6: Macromolecules are large - sized molecules. Their defining characteristic is size.
• Question 7: Proteins, nucleic acids, and carbohydrates are polymers. Lipids are not polymers in the same sense as they are not made of repeating monomer units like the others.
• Question 8: Carbohydrates are composed of carbon, hydrogen, and oxygen. Phosphorus is not a part of the basic structure of carbohydrates.
• Question 9: Nucleic acids (DNA and RNA) are macromolecules. DNA contains genes which are the units of heredity. During reproduction, DNA is passed from parents to offspring, carrying the genetic information that determines traits.
• Question 10: Water molecules adhere to each other through hydrogen bonds, not covalent bonds.
• Question 11: Its adhesion (not cohesion) allows water to transport nutrients and wastes in plants and animals. Cohesion is the attraction between water molecules, while adhesion is the attraction between water and other substances.
• Question 12: A solution with a pH less than 7 is acidic, not basic.
• Question 13: Water has a high specific heat capacity. It requires a large amount of heat energy to change its temperature, thus resisting temperature changes.
• Question 14: Water is called the "universal solvent" because it can dissolve a wide variety of substances due to its polar nature.

Answer:

• 6. A. size
• 7. A. lipids
• 8. D. phosphorus
• 9. Nucleic acids (DNA) carry genetic information and are passed from parents to offspring, determining traits.
• 10. False. Replace "covalent" with "hydrogen".
• 11. False. Replace "cohesion" with "adhesion".
• 12. False. Replace "basic" with "acidic".
• 13. Water has a high specific - heat capacity, requiring a large amount of heat to change its temperature.
• 14. Water is polar and can dissolve a wide variety of substances.