Biology CA #2

Which structure, composed mainly of proteins and phospholipids, aids in maintaining homeostasis in a cell?

• Chromosome
• Centrosome
• Cell Membrane
• Nucleolus

A white blood cell is responsible for the removal harmful agents, like bacteria, from our bloodstream. What organelle helps this cell perform its main function?

• Mitochondria
• Lysosome
• Cell Membrane
• Ribosome

What organelle is associated with the production of proteins?

• nucleus
• ribosome
• mitochondria
• cell membrane

The cell membrane is made mostly of

• phospholipid monolayer and proteins
• phospholipid bilayer and proteins
• proteins and carbohydrates bilayer
• triglycerides and carbohydrates

Over time, what would happen to the concentration of O₂ in the cell?

• It would decrease because cells naturally move from low to high
• It would decrease because the cell has more CO₂
• It would increase because the cell has too much CO₂
• It would increase because cells naturally move from high to low

A model cell that is 30% filled with dye is placed into a beaker of distilled water. After 20 minutes in the beaker, the concentration of the dye went from 30% to 20%, but no dye left the cell. Which best explains what occurred to the model cell?

• Water diffused into the model cell.
• There was a chemical reaction and dye was lost.
• Water was lost from the model cell.
• The dye disappeared.

What occurs in the S phase?

• Cell Growth
• Replication of DNA
• Preparation for Mitosis
• Cell Division

What process occurs following fertilization (the combining of a sperm and egg)?

• Meiosis
• Growth
• Mitosis
• None of the above

A mutation occurred in a sperm cell on one of its chromosomes. The change will likely - 

• create a pathogen
• convert the sex cell to a body cell
• change the number of chromosomes
• be passed on to every cell that develops from that sperm cell

Fruit fly body cells have 8 chromosomes. After mitosis, you would expect a resulting fruit fly daughter cell to have ...

• 16 chromosomes.
• 46 chromosomes.
• 8 chromosomes.
• 4 chromosomes.