Cells and Tissues MCQs - MCQtimes.com

The process of “diffusion” through a membrane may be described by which of the following?

The movement of ions and molecules away from regions where they are in high concentration towards regions where they are in lower concentration.

The use of energy from ATP to move ions and small molecules into regions where they are in lower concentration.

The plasma membrane engulfs the substance and moves it through the membrane.

The use of energy from ATP to move water molecules against their concentration gradient.

The choices with ATP are nonsense. While choice C refers to endocytosis.

Author: rikazzz Comment

Cells and Tissues

Which one of the following is NOT a function of membrane proteins?

They form a structure called a glycocalyx.

They attach cells to each other.

They form passageways to allow solutes to pass through the membrane.

They from receptors which can bind messenger molecules.

The glycocalyx is thought of as being membrane carbohydrates.

Author: rikazzz Comment

Cells and Tissues

What happens during anaphase of mitosis?

Spindle fibres pull each chromatid to opposite sides of the cell.

The sense and nonsense strands “unzip” along their hydrogen bonds.

RNA polymerase forms a complementary strand by reading the sense strand.

The cell cytoplasm divides into two cells.

Separation of the two chromatids of a chromosome occurs at anaphase. Choice D is cytokinesis and begins in late anaphase and continues into telophase.

Author: rikazzz Comment

Cells and Tissues

Which of the following is a component of the plasma membrane of a cell?

Plasma

Glycolipid

Plasma proteins

Cholesterol

Despite the term “plasma”, A and C are wrong. And it is phospholipids, not glycolipids, that occur in the membrane.

Author: rikazzz Comment

Cells and Tissues

Which of the following is NOT an example of connective tissue?

Blood

Bone

Tendon

Epidermis

The epidermis (on top of the dermis) is epithelial tissue.

Author: rikazzz Comment

Cells and Tissues

What is the name of the membrane that surrounds the lungs?

Visceral peritoneum

Parietal peritoneum

Visceral pleura

Dura mater

Pleura is around the lungs, while visceral refers to the layer of the pleura that is attached to the lung surface.

Author: rikazzz Comment

Cells and Tissues

Which of the following is an epithelial tissue?

Adipose tissue

The adrenal gland

The heart

Blood

The adrenal gland is glandular epithelial tissue.

Author: rikazzz Comment

Cells and Tissues

Facilitated diffusion through a membrane involves which of the following scenarios?

The diffusion of water through a selectively permeable membrane along its concentration gradient

The movement of a molecule against its concentration gradient with the expenditure of energy

The plasma membrane surrounding (engulfing) the molecule and the mol-ecule moving into the cell

A molecule binding to a receptor which moves the molecule through the membrane without the expenditure of energy

Facilitation is by binding to a membrane protein.

Author: rikazzz Comment

Cells and Tissues

Cell membranes can maintain a difference in electrical charge between the interior of the cell and the extracellular fluid. What is this charge difference called?

Excitability

The membrane potential

The action potential

The sodium-potassium pump

The inside of a cell is negative, while the exterior side of the membrane is positive. This difference in charge constitutes a difference in electrical potential (or voltage), known as the resting membrane potential. An action potential is generated when the membrane is stimulated and the potential reversed.

Author: rikazzz Comment

Cells and Tissues

What is the tissue that covers the body surface and lines internal tubes called?

Epithelial tissue

Connective tissue

Glandular epithelium

Muscle tissue

Epithelial tissue has one surface “open” to the exterior or to the contents of the tube.

Author: rikazzz Comment