Unit 1 & 2 Review

What does homeostasis mean?

• respond to their environment

• maintain a stable internal environment

• made up units called cells

• based on a universal genetic code

Which of the following characteristics of living things best explains why your legs and arms get longer and stronger as you get older?

• Living things respond to their environment.

• Living things have heredity and pass on traits to their offspring.

• Living things are made up of units called cells.

• Living things grow and develop.

In all our cells, there is DNA. Which characteristic does this fact best describe?

• Living things respond to their environment.

• Living things have heredity and pass on traits to their offspring.

• Living things are made up of units called cells.

• Living things grow and develop.

Which activity is an example of the human body striving to maintain homeostasis?

• Creating thoughts to solve a difficult problem

• Digesting foods to reduce their particle size

• Producing sweat to reduce body temperature

• Springing across a street to avoid oncoming traffic

How many protons does Strontium have?

• 38

• 87.620

• 126

• 50

What is the atomic mass of Strontium?

• 38

• 87.620

• 126

• 50

How many neutrons does Strontium have?

• 38

• 87.620

• 126

• 50

How many electrons do elements want to have in their outer energy level?

• 2

• 4

• 6

• 8

When a nonmetal bonds with a nonmetal, this is an example of what type of bond?

• ionic bond

• covalent bond

• metallic bond

• peptide bond

When a nonmetal bonds with a metal, this is an example of what type of bond?

• ionic bond

• covalent bond

• metallic bond

• peptide bond