Exam #2 Mock Exam

While water continually orients phospholipids into a lipid bilayer, it does not fix the lipids permanently into one position. So the lipid bilayer is considered to be _______.

• static

• fluid

• fluctuating

• charged

Which of the following does not move through a nuclear pore?

• RNA

• Proteins

• DNA

As the two strands of DNA are unraveled, which enzyme relieves the strain on the two strands?

• DNA polymerase

• DNA ligase

• DNA gyrase

• DNA endonuclease

• DNA exonuclease

The nucleolus is the site of __________.

• protein synthesis

• ribosome assembly

• chromosome replication

• lipid synthesis

• uncoiling and unraveling of chromosomes

The synthesis of a growing strand of DNA is carried out by adding nucleotides to which end of an existing strand?

• 2'

• 3'

• 5'

• 1'

What is the name of the cellular process that is referred to as "cellular eating"?

• osmosis

• pinocytosis

• phagocytosis

• diffusion

• active transport

A distinctive feature of eukaryotes is the organization of tightly packaged chromosomal DNA with proteins into a membrane-bound structure called a __________.

• nucleolus

• cell

• nucleus

• plasma membrane

The evolutionary process that explains the presence of chloroplasts and mitochondria in eukaryotic cells is called _________.

• endosymbiosis

• evolution

• symbiosis

• punctuated equilbrilium

Osmosis is the diffusion of water across a membrane in response to the concentration of which of the following?

• Solutes

• Membranes

• Compartments

• Cells

Mitochondria and chloroplasts are the other organelles besides the nucleus that contain __________.

• DNA

• pores

• channels

• plasma membranes

• pigments