Midterm

Question 1

A community is

Answer 1

a group of interacting organisms coexisting in an area

Question 2

Adaptations are

Answer 2

Changes in gene sequence produce proteins that allow a group of organisms to grow and reproduce in their environment.

Question 3

An ecosystem

Answer 3

An area of the world, with its interaction organisms, and physical environment

Question 4

An experiment requires

Answer 4

An independent variable, a dependant variable, a control variable, and controllable variables

Question 5

an organ system

Answer 5

is a group of organs working together

Question 6

Biodiversity is

Answer 6

The variety of life on Earth or an area of the Earth

Question 7

Homeostasis is

Answer 7

organisms maintaining a stable internal environment

Question 8

Metabolism is

Answer 8

The sum of all the chemical reactions in organisms

Question 9

Natural selection

Answer 9

is an important process in Evolution

Question 10

Natural selection means

Answer 10

The differential survival and reproduction of an organism better suited for a particular environmental challenge

Question 11

Most single-cell organisms

Answer 11

Have no nucleus and have no membrane-covered organelles and are called prokaryotes

Question 12

Most single-cell organisms

Answer 12

are found in Domains Bacteria and Archaea.

Question 13

Some single-cell organisms

Answer 13

have a nucleus and are found in Domain Eukaryote.

Question 14

The single-cell organisms with a nucleus are called

Answer 14

Protists

Question 15

In a lab, we studied the Challenges facing scientists name one

Answer 15

“Emerging Diseases” and “Population Growth”

Question 16

The steps of an experiment are

Answer 16

a. observation. d.experiment or test
b. Question. e. Conclusion
c. Hypothesis

Question 17

What force causes the formation of helical(helix) structures in macromolecules?

Answer 17

Hydrogen Bonds

Question 18

What elements are always found in organic molecules?

Answer 18

Carbon and Hydrogen

Question 19

What are the four forms of protein structure

Answer 19

a. primary c.. Tertiary

b. Secondary d. Quaternary

Question 20

What are the organic molecules?

Answer 20

a. Carbohydrates c. proteins

b. Lipids. d. Nucleic Acids

Question 21

The valence shell of an atom must contain–_______ electrons to be full.

Answer 21

8

Question 22

What two elements are exceptions to the 8 electrons in a valence shell?

Answer 22

Hydrogen and Helium

Question 23

What does a covalent bond mean?

Answer 23

Elections are shared in the valence shells of both atoms

Question 24

What does an ionic bond mean?

Answer 24

Transfer of one or more valence electrons from one atom to another

Question 25

The bonds of the hydrogens in a water molecule form a “V” shape because

Answer 25

Unequal sharing of the electrons

Question 26

Way do no lipids mix with water?

Answer 26

Lipids are non-polar.

Question 27

What does polar mean?

Answer 27

one end of the molecule is slightly positive while the other end is slightly negative

Question 28

A macromolecule is called a polymer because?

Answer 28

It is made up of repeating subunits called monomers

Question 29

Glycogen is

Answer 29

a storage form of glucose

Question 30

What is glycogen made up of?

Answer 30

glucose subunits

Question 31

What is another storage form of glucose like glycogen?

Answer 31

starch

Question 32

What is a storage form of glucose but is not used by most animals as food?

Answer 32

Cellulose

Question 33

What can be made into wood?

Answer 33

cellulose