Exam 3: Cell Structure and Function

The concentration of ________ determines the osmotic pressure of a solution.

When a protein is synthesized on fixed ribosomes, it is threaded into the lumen of which structure(s)?

The chemical cochicine, from a flowering plant, blocks the building of tubulin proteins into microtubules. This would cause cell damage by

The folds of the internal membrane within mitochondria are called

The cytoplasmic division that forms two daughter cells is called

The job of a sperm cell, or spermatozoan, is to get to the egg as soon as possible and fertilize it. Sperm cells would be expected to have a lot of

The peroxisome

A "benign tumor" refers to

What is the benefit of having some of the cellular organelles enclosed by a membrane similar to the plasma membrane?

Figure 3-2 A Process Use Figure 3-2 to answer the following questions: -Using the preceding image, determine the correct sequence of events in the primary process, which begins when target molecules (ligands) bind to receptors in the plasma membrane. 1. Target molecules are removed and absorbed into the cytoplasm. 2) The membrane containing the receptor molecules detaches from the lysosome. 3) Pockets pinch off, forming coated vesicles. 4) Areas coated with ligands form deep pockets in the membrane surface. 5) The vesicle fuses with the plasma membrane. 6) Coated vesicles fuse with lysosomes.

During which phase of cell division do the chromatids line up along the equator of the cell?

Examination of a sample of cells reveals large numbers of mitochondria compared to most other cells. Which of the following is a likely reason for this?

The concept that each cell of an organism maintains homeostasis is part of our understanding of

Paired structures made of microtubules that are perpendicular to each other are called the

Which of these transport mechanisms do not fit into the rest of the group listed?

The nucleus ultimately controls the synthesis of which of the following molecules?

Structurally, the plasma membrane

A mechanism in which two substances move in opposite directions across the cell membrane is called

Figure 3-8 A Process Use Figure 3-8 to answer the following questions: -Identify the process featured in the image.

In a malignant tumor, which of the following is true?