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Exam 3: Cells

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A microfilament is made of tiny rods of actin protein.

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Studies show that chronic psychological or emotional stress as well as clinical depression or obesity can stimulate telomere lengthening.

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If a 5% dextrose solution is isotonic to blood, a 2% dextrose solution would be __________.

What is apoptosis?

All differentiated cell types in a human body arise through lineages of stem and progenitor cells.

The genetic material (DNA) is the component of the cell that carries hereditary information.

Which of the following is not a component of the cell membrane?

Among other functions, lysosomesdetoxify alcohol and break down hydrogen peroxide.

Cells are placed in a solution that causes them to absorb liquid until they burst. When some of the water is removed from the solution, newly added cells do not burst. The original solution was __________ to the cells, while the second was __________ to the cells.

Roughly how many cells are in the adult human body?

During the metaphase of mitosis, chromosomes line up between the two centrioles.

During _______, chromatids separate and become chromosomes that are pulled toward opposite ends of the cell.

Within the nucleoplasm, ribosomes are formed in a small dense body called the __________.

Receptor-mediated endocytosis is another name for facilitated diffusion.

An organelle that is a fluid-filled sac with inner partitions studded with enzymes is a mitochondrion.

What organelle houses enzymes that degrade cellular debris?

A cell that secretes abundant proteins, such as a cell in the pancreas secreting insulin, would have extra nuclei.

If an isotonic saline solution is 0.9% NaCl, a 0.25% NaCl solution would be __________.

Why is the interior of a cell membrane oily?

Vesicles are formed mainly by folding of the __________.