AP Biology Unit 8 Review

What do the error bars in the graph say about data?

• The data for Group 1 has a lower mean value.

• The data for Group 2 has a higher degree of variability.

• The data for Group 1 has a higher degree of accuracy.

• The data for Group 1 and 2 has the same degree of coefficient of variation.

Tags

NGSS.HS-LS3-3

Which of the macromolecules below could be structural parts of the cell, enzymes, or involved in cell movement or communication?

• nucleic acids

• proteins

• lipids

• carbohydrates

The partial negative charge at one end of a water molecule is attracted to a partial positive charge of another water molecule. What is this type of attraction called?

• a polar covalent bond

• an ionic bond

• a hydration shell

• a hydrogen bond

Water is an excellent solvent. Select the property that justifies this statement.

• as a polar molecule, it can surround and dissolve ionic and polar molecules

• it forms ionic bonds with ions, hydrogen bonds with polar molecules, and hydrophobic interactions with non polar molecules

• it forms hydrogen bonds with itself so cohesion is possible

• it is liquid and will adhere to many substances

An organic compound that is composed of carbon, hydrogen, and oxygen in a 1:2:1 ratio is known as a

• lipid

• carbohydrate

• protein

• nucleic acid

If the pH of a solution is decreased from 7 to 6, it means that the concentration of

• H+ has decreased to 1/10 of what it was at pH 7

• H+ has increased 10 times what it was at pH 7

• OH- has increased 10 times what it was at pH 7

• OH- has increased by 1/7 of what it was

Large bodies of water do not quickly fluctuate in temperature. Why?

• Water is a solvent.

• Water has a high heat capacity.

• Water acts as a buffer.

• Water is non-polar.

Tags

NGSS.HS-PS3-4

What makes a molecule polar?

• Equal sharing of valence electrons

• Unequal sharing of valence electrons

• Stealing of electrons

• Temporary charges that come and go

Tags

NGSS.HS-PS1-1

Water has a much higher specific heat than most other covalent compounds. What do you predict might happen if water had a low specific heat instead?

• Flooding would occur and animals would be forced to migrate

•  Harmful organisms living in water would reproduce at a rapid rate

• Organisms that are sensitive to changes in temperature would die

• Plants would not have enough water to effectively carry out photosynthesis

Describe COHESION.

• Water molecules attracted to other substances.

• Water molecules climbing upwards against the force of gravity.

• Water molecules dissolving many substances because of its polarity.

• Water molecules attracted to other water molecules.