Desensitization to prevent an allergic response can be accomplished by injecting small, repeated doses of
a. IgE antibodies.
b. the antigen (allergen).
c. histamine.
d. IgG antibodies.
e. antihistamine.

Give a practical laboratory method that you might use to produce small quantities of the following gases and comment on any difficulties that might arise:
(c) $\mathrm{H}_2$;

Give a practical laboratory method that you might use to produce small quantities of the following gases and comment on any difficulties that might arise:
(d) $\mathrm{NH}_3$;

The problem involves a function of three variables with one constraint.
Smallest Sum Find three real numbers whose sum is $9$ and the sum of whose squares is as small as possible.

Select the correct answer, and write it on the line provided.
An inflammation of the stomach and small intestine is known as ________.
gastralgia$\hspace{2cm}$gastroenteritis$\hspace{2cm}$gastritis$\hspace{2cm}$gastrosis

Select the word or phrase that best completes the statement from the choices listed below. Very small numbers are represented in scientific notation using _______________ powers of 10. (negative/positive)

You have a fixed length of wire to wind into an inductor. Will you get more inductance if you wind a short coil with large diameter, or a long coil with small diameter?

What evidence convinced scientists that Archaeopteryx should be classified as a bird rather than a small dinosaur? a. teeth b. hollow bones c. hard-shelled eggs d. feathers

Anaphylaxis is the term for reactions caused when certain antigens combine with _____________.

A. histamine.

B. complement.

C. macrophages.

D. IgG antibodies.

E. IgE antibodies.

A single-slit diffraction pattern is formed on a distant screen. Assuming the angles involved are small, by what factor will the width of the central bright spot on the screen change if the wavelength is doubled?

Where is histamine located in the body? What stimulates histamine release?

Anaphylaxis is the term for reactions caused when certain antigens combine with what?

A) IgE antibodies.

B) macrophages.

C) IgG antibodies.

D) complement.

E) histamine.

In the sentence below, underline each direct object once, underline each indirect object twice, and circle each objective complement.

She called the small creature “dangerous.”

Give a practical laboratory method that you might use to produce small quantities of the following gases and comment on any difficulties that might arise:
(e) $\mathrm{CO}_2$.