GED Science : Other Cell Concepts

Study concepts, example questions & explanations for GED Science

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Example Questions

Example Question #1 : Other Cell Concepts

During what portion of the cell cycle does the replication of DNA take place?

Possible Answers:

S phase

G1 phase

M phase

G2 phase

Correct answer:

S phase

Explanation:

There are two fundamental sections of the cell cycle: mitosis and interphase. The M phase denotes mitosis, during which the cell divides. Interphase is composed of several subsections during which the cell grows, organelles replicate, and the cell prepares for division.

Interphase can be divided into the subsections G1, S, and G2. While G1 and G2 are dedicated to the growth of the cell and organelle replication, the S phase is when cellular DNA is replicated.

Example Question #2 : Other Cell Concepts

Which of the following membrane transport mechanisms is not an active processes?

Possible Answers:

Endocytosis

Active transport

Pinocytosis

Phagocytosis

Diffusion

Correct answer:

Diffusion

Explanation:

Passive transport processes move ions or molecules across the plasmalemma without any energy expenditure by the cell whereas active transport processes involve the cell spending energy.

During diffusion a molecule moves from an area of high concentration to an area of low concentration. Movement is achieved following the concentration gradient and no energy is spent by cell.

Example Question #3 : Other Cell Concepts

Which of these cell transportation processes is the most selective?

Possible Answers:

Pinocytosis

Diffusion

Endocytosis

Osmosis

Receptor-mediated endocytosis

Correct answer:

Receptor-mediated endocytosis

Explanation:

Receptor-mediated endocytosis is a process that resembles pinocytosis but is far more selective and only allows the entry of specific molecules into the cell. Target substances are bound to receptors on the membrane surface and brought into the cell via coated vesicles.

Example Question #3 : Other Cell Concepts

Which of the following is not one of the three cell theory concepts?

Possible Answers:

Cells are the smallest structural units that perform all vital functions

Cells must have a nucleus

Cells are produced by the division of preexisting cells

None  of these are concepts of the cell theory

Cells are the structural "building blocks" of all plants and animals

Correct answer:

Cells must have a nucleus

Explanation:

A cell does not have to have a nucleus. Prokaryotic cells are characterized by the fact that they don't have a nucleus nor any other membrane-bound organelles. However the rest of the statements are true of all cells and comprise cell theory.

Example Question #4 : Other Cell Concepts

Bacteria are examples of prokaryotic cells.

Which of the following cell structures are found in prokaryotic cells?

Possible Answers:

Ribosomes, nucleus, cytoplasm, cell membranes, and flagella

Nucleus, cytoplasm, ribosomes, cell membranes, and cell walls

Ribosomes, chromosomes, cytoplasm, cell membranes, and cell walls

Chromosomes, lysosomes, cell walls, cilia, and endoplasmic reticulum

Nucleus, mitochondria, chromosomes, vacuoles, and flagella

Correct answer:

Ribosomes, chromosomes, cytoplasm, cell membranes, and cell walls

Explanation:

Bacterial cells have cell membranes, cell walls, chromosomes, cytoplasm, and ribosomes. They may have flagella or cilia as well. They do not contain any membrane-bound organelles, such as the nucleus, endoplasmic reticulum, or mitochondria.

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