AP Biology Science Practices

In what phase of the cell cycle does DNA replication take place?

• G1

• S

• G2

• M

What is A?

• Leading strand

• Lagging strand

• Okazaki Fragments

• DNA plymerase

The separation of the two single strands of DNA creates a ‘Y’ shape?

• enzyme

• unzip

• A replication fork

Which enzyme proofreads and removes RNA Primase

• Ligase

• Polymerase 1

• Polymerase 3

• Helicase

Which of the following statements about diffusion is true?

• It is very rapid of long distances.

• It requires an expenditure of energy by the cell.

• It is an active process in which molecules move from a region of lower concentration to a region of higher concentration.

• It is a passive process in which molecules move from a region of higher concentration to a region of lower concentration.

Which cell is in a hypertonic environment?

• A

• B

• C

• None of them are hypertonic

Tags

NGSS.HS-LS1-3

Assuming that the purple molecules are too large to pass through the membrane, what would happen to the water level as a result of osmosis?

• The water level would rise on the A side

• The water level would rise on the B side

• The water level would remain constant

• The water level would drop on the A side.

Tags

NGSS.HS-LS1-3

According to the fluid mosaic model of cell membranes, phospholipids___________________.

• can shift laterally along the plane of the membranee

• frequently flip-flop from one side of the membrane to the other

• occur in an uninterrupted bilayer, with membrane proteins restricted to the surface of the membrane

• have hydrophilic tails in the interior of the membrane

Which of the following types of molecules are hydrophilic and therefore excluded from the hydrophobic portion of the phospholipid bilayer?

• transmembrane proteins

• integral membrane proteins

• peripheral proteins

• cholesterol

In what way do the membranes of a eukaryotic cell vary?

• Phospholipids are found only in certain membranes

• Certain proteins are unique to each membrane

• Only certain membranes of the cell are selectively permeable

• Some membranes have hydrophobic surfaces exposed to the cytoplasm while others have hydrophilic surfaces facing the cytoplasm.