Which of these is NOT one of the four general categories of cells that make up t

Question

Which of these is NOT one of the four general categories of cells that make up the humans body? A) connective tissue cell B) epithelial cells C) muscle cell D) neuron E) collagen cells Which correctly describes the structure of an atom? A) There are always the same number of protons and electrons. B) There are always the number of protons and neutrons. C) There are always the same number of neutrons and electrons. D) There are never the same number of neutrons and protons. E) The number of protons, neutrons, and electrons is always the same Which is a major function of the plasma membrane? A) providing genetic information B) storing calcium ions C) storing organic chemicals for metabolism D) regulating the passage of molecules into and out of the cell E) generating ATP What is the main function of cellular tight junctions? A) They hold the genetic material in a tightly coiled conformation. B) They are protein channels that allow the movement of ions between the cytosol of adjacent cells. C) They are spaces that allow movement of substances between the interior of the nucleus and the cytosol. D) They resist forces that tend to pull cells apart. E) They form barriers that restrict the passage of materials through the extracellular space between cells. The cell membrane is composed mainly of A) phospholipids and nucleic acids. B) proteins and glycocalyx. C) cytosol. D) water. E) phospholipids and proteins.

Explanation / Answer

1. d.neuron

Neuron is the structural and functional unit of the nervous system.

2. a. There are always the same number of protons and neutrons.

An atom has neutral charge as it has an equal number of negative charges or electrons and positive charges or protons.

3. d. Regulating the passage of molecules in and out of the cell.

Plasma membrane composed of phospholipid bi-layers with embedded proteibs is selectively permeable to ions and molecules which regulates the movement of substances in and out of the cell.

4. e. They form barriers that restricts the passage of materials through the extracellular space between cells.

Tight junctions limit the passage of ions and molecules through the extracellular space.

5. e. Phospholipid and proteins

The cell membrane is a semi-permeable membrane composed of phospholipids and proteins which are also described as phospholipid bi-layers.

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