bio 189 quiz 3

Question 1

electrons equals

Answer 1

the # of protons

Question 2

neutrons equals

Answer 2

the difference between the mass # and the atomic #

Question 3

protons equals

Answer 3

the atomic #

Question 4

hydrogen bonds

Answer 4

dipole dipole attraction between molecules

Question 5

ionic bonds

Answer 5

attraction between oppositely charged ions in a chemical compound (transfer of electrons)

Question 6

polar covalent bonds

Answer 6

electrons are unequally distributed

Question 7

non polar covalent bonds

Answer 7

electrons are shared equally between two atoms

Question 8

pH defined

Answer 8

a quantitive measure of the acidity or basicity of aqueous or other liquid solutions

anything bellow 7 is acidic
anything above 7 is alkaline or basic

Question 9

sugars defined

Answer 9

a monosaccharide or a disaccharide, a form of carbohydrate that the body converts to glucose

Question 10

starches defined

Answer 10

a polysaccharide comprising glucose monomers joined in a 1,4 linkage

Question 11

examples of proteins

Answer 11

collagen(skin), keratin (hair, insulin (diabetes), enzymes

Question 12

what is a protein

Answer 12

a polymer

Question 13

what is an amino acid

Answer 13

monomer

Question 14

what is the component that changes in an amino acid?

Answer 14

the r-group

Question 15

what is the dehydration synthesis?

Answer 15

water goes out so you can build a protein

Question 16

A and G amino acids are what

Answer 16

purines

Question 17

C,U,T amino acids are what

Answer 17

pyrimidines

Question 18

how many strands does DNA form

Answer 18

2

Question 19

How many stands does RNA form

Answer 19

1

Question 20

the presence of lipids has a positive result, what color is that

Answer 20

Briliant orange color

Question 21

The presence of proteins have a positive result, what color is that

Answer 21

violet purple color, the more peptides the darker the color

Question 22

Look at the molecule shown below. Which statement about the R side chain of this molecule is correct?

Answer 22

This region determines how the amino acid interacts with other molecules.

Question 23

What type of reaction would produce the results shown below?

Answer 23

A hydrolysis reaction breaking a peptide bond.

Question 24

Which of the following nitrogenous bases would not be used in the construction of a DNA polymer?

Answer 24

Uracil

Question 25

What part of the nucleotide should you look at if you are trying to determine if you are looking at a purine or a pyrimidine?

Answer 25

examine the nitrogenous bases

Question 26

What does the intensity of a positive Sudan test indicate?

Answer 26

concentration of lipids

Question 27

Imagine you are testing two samples, A & B, that have been placed on paper to absorb (in a drawn circle).

After you perform the Sudan test:

the circle containing sample A is blue
the circle containing sample B is orange
What is the correct interpretation of these results?

Answer 27

The orange color indicates a positive test for lipids, so Sample B contains lipids.

Question 28

If a test tube contained a clear solution of individual amino acids (monomers), what would you predict would be the result of a Biuret test on this sample?

Answer 28

The sample would change color to blue-green, indicating a negative result.

Question 29

What does the color intensity of a positive Biuret test indicate?

Answer 29

Concentration of peptide bonds

Question 30

What does the color intensity of a positive Dische diphenylamine test indicate?

Answer 30

Concentration of deoxyribose

Question 31

If a test tube contained an RNA solution, what would you predict would be the result of a Dische diphenylamine test on this sample?

Answer 31

The sample would remain clear, indicating a negative result.