Practice Exam 1

electrons

are the subatomic particles most involved in bonding behavior of atoms.

Which of the following is CORRECTLY matched with its function?

receptor proteins - attach to ligand molecules

Which of the following statements concerning connective tissue is true?

Collagen fibers provide strength to dense connective tissue.

an organ is

a structure composed of several tissue types

which of the following is a proton donor

an acid

When ionic compounds dissolve in water, their ions

dissociate or separate from one another.

Chemical substances that dissolve in water or react with water to release ions are known as _________.

electrolytes

in ionic bonding,

electrons are transferred from one atom to another.

which tissue type forms glands

epithelial

The change in size of the bone marrow (where blood cells are produced) as an infant matures is an example of _________, whereas the transformation of blood stem cells into white blood cells is an example of _________.

growth; differentiation

Molecules that serve as chemical signals to open or close gated ion channels are _________.

ligands

The extracellular material of tissues is called _________.

matrix

Which type of tissue is contractile?

muscle tissue

during exercise, one generates excess heat and the body temperature rises. As a response, blood vessels dilate in the skin, warm blood flows closer to the body surface, and heat is lost. this is an example of ________

negative feedback

the plasma membrane

regulates movement of materials into and out of the cell.

Which of the following is a function of epithelial tissue?

secretion and absorption of molecules

anatomy is

the study of structure

which of the following is not a characteristic of homeostatic variables

they always remain at a fixed value

A symporter will transport _________ across the plasma membrane.

two different ions or molecules in the same direction

When a sperm cell comes into contact with an egg cell, there is a change in the electrical charge across the plasma membrane and various channel proteins close. These channels would be called _________ channels.

voltage-gated