If a subtance cannot be broken down chemically into a simpler subtance, what is it?

an element

an atom

a compound

a molecule

An Rh - mother is given Rh immune globulin during her pregnancy. Rh immune globulin prevents formation of antibodies to Rh antigens. Explain why this is done.

Why are bacteria needed in the nitrogen cycle

Removing which of the following glands would most likely have the most wide - reaching effect on bodily functions of an adult human? A) thyroid gland B) posterior pituitary gland C) hypothalamus D) anterior pituitary gland

a mutation in a triplet code that ends up coding for the same amino acid is referred to as a silent mutation. in what sense is it silent?

Sexual reproduction is different from asexual reproduction in which way? sexual reproduction requires fertilization of an egg by a sperm. sexual reproduction occurs with only a single parent. asexual reproduction requires two kinds of cell division.

Meiosis is a specialized form of cell division that that produces

Gee's arm was cut during an industrial accident. the blood was pouring from the wound in spurts. which type of vessel was severed?

Why does Betelgeuse have a much greater absolute magnitude than apparent magnitude?

The cell's nucleus is filled with a substance called protein.

How are genes related to chromosomes?