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Exam 3: Cells: the Living Units

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Question 1

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If a human cell were to increase the amount of cholesterol embedded within its plasma membrane, which of the following would most likely happen?

A) The plasma membrane would become more stable, less fluid, and less permeable.
B) The cell would form a plaque that could potentially block a blood vessel.
C) The plasma membrane would become more permeable to ions and less permeable to lipids.
D) The plasma membrane would become more fluid and the phospholipids less stable.

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Question 2

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If a cell is selectively reducing the concentration of a particular enzyme in the extracellular fluid it will likely utilize __________ .

A) pinocytosis
B) phagocytosis
C) receptor-mediated endocytosis
D) exocytosis

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Question 3

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At the age of 6 months, Caleb was diagnosed with Tay-Sachs disease. As his primary care physician, what would you tell his parents about this disease?

Research shows that neurofibrillary tangles associated with the disintegration of microtubules are the primary cause of Alzheimer's disease. If microtubules disintegrate, what then might happen to brain cells?

What are lipid rafts? What are their functions?

The phase of a cell life cycle in which the DNA is replicated is called _________.

Myocardium (cardiac muscle tissue) must rhythmically contract for a lifetime. This requires a considerable amount of energy production by the cells. You would expect to see a relatively high amount of which organelle in these cells?

The myocardium (cardiac muscle tissue) undergoes a significant amount of physical stress due to its contractions. You would expect to see relatively large numbers of which of the following embedded within their plasma membrane?

Which of the following will NOT speed up the net rate of diffusion for glucose into a cell?

_________is the division of the cytoplasmic mass into two parts.

In which stage of mitosis do the identical sets of chromosomes line up along the midline or equator of the cell?

Osmosis is the passive movement of water, but it follows almost completely opposite laws of physics when compared to the diffusion of ions or other small particles.

Which of the following is NOT a function of the smooth endoplasmic reticulum?

If the nucleotide or base sequence of the DNA strand used as a template for messenger RNA synthesis is ACGTT, then what would be the sequence of bases in the corresponding mRNA?

Briefly describe the glycocalyx and its functions.

Microfilaments are thin strands of the contractile protein composed of myosin.

When tissues are injured or infected, chemical signals can be releases that affect the plasma membrane of cells that line the nearby blood vessels. These blood vessels' cells (endothelial cells) respond to the chemical signals by displaying a type of glycoproteins on their surface. These proteins will attach to circulating white blood cells bringing them to the site of injury or infection. These glycoproteins would best be described as .

Aerobic cellular respiration occurs in the_________ .

Which of the following statements is correct regarding net diffusion?

If cells are placed in a hypotonic solution containing a solute to which the membrane is impermeable, what could happen?