Exam 1

Question 1

Hypotheses are tested by conducting

Answer 1

Experiments

Question 2

The scientific study of living organisms and how they have evolved is called

Answer 2

Evolution

Question 3

Of the following biological levels of organization, which represents the lowest level?
a. Organs b. Populations C. Cells d. Organisms e. Tissues

Answer 3

C. Cells

Question 4

Two isotopes of an element differ in the number of

Answer 4

Neutrons

Question 5

Which of the following ph values represents a stronger acid?
a. 4 b.10 C. 14 d. 2 e. 7

Answer 5

d. 2

Question 6

In __ _____ bond, electrons are transferred from one atom to another

Answer 6

an ionic

Question 7

In ___ ________ bond, electrons are shared between atoms

Answer 7

a covalent

Question 8

The chemical properties of an atom are determined by the number of ________ in outer shell

Answer 8

electrons

Question 9

The identity of an element is determined by the number of _______

Answer 9

protons

Question 10

The high boiling point of water is caused by ________ bonds between its molecules

Answer 10

hydrogen

Question 11

A ______ is a substance that resists a change in ph

Answer 11

buffer

Question 12

If in a covalent bond, 2 pairs of electrons (4) are shared, it is called a _____ ______bond

Answer 12

single covalent

Question 13

The number of different kinds of bases found in DNA is ___

Answer 13

4

Question 14

Glucose has ___ carbon atoms

Answer 14

6

Question 15

There are ___ different amino acids

Answer 15

20

Question 16

A disaccharide has __ simple sugars bonded to each other

Answer 16

2

Question 17

The number of fatty acids in a triglyceride is __

Answer 17

3

Question 18

Double helix describes the structure of a molecule of ____

Answer 18

DNA

Question 19

Triglycerides contain ______ ______and ___________

Answer 19

fatty acids and glycerol

Question 20

Animals form of starch is called ________

Answer 20

glycogen

Question 21

The bond between two amino acid molecules is called _________

Answer 21

peptide

Question 22

The sequence of amino acids in a protein is called

Answer 22

primary structure

Question 23

What kind of bonds hold together the nitrogen bases in a DNA molecule?

Answer 23

Hydrogen bonds

Question 24

Give an example of a disaccharide

Answer 24

sucrose or lactose

Question 25

Which nitrogen base is found in DNA and not in RNA?

Answer 25

Thymine

Question 26

Cell membranes are made of phospholipids arranged in a ________

Answer 26

bilayer

Question 27

____________ refers to protein losing its 3-d structure

Answer 27

Denaturation

Question 28

Hereditary information is stored in _____ __________

Answer 28

DNA molecules

Question 29

Define ecosystem

Answer 29

All the organisms that live in an environment and their interactions with the non-living elements such as temperature, humidity, soil, water and air content etc.

Question 30

What agents can cause denaturation of a protein?

Answer 30

Heat, high pH, low pH, detergents, agitation

Question 31

Give an example of a steroid

Answer 31

Cholesterol

Question 32

Give an example of where you can find waxes

Answer 32

Birds feathers, bees’s wax

Question 33

Draw the structure of a general amino acid

Question 34

M