Gen Bio CH 3 Flashcards


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created 10 years ago by Bixl1579
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CH 3
updated 10 years ago by Bixl1579
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1

Which one of the following is an amino group?

NH2

2

Which one of the following contains a carboxyl and an amino group?

AMINO ACIDS

3

DNA differs from RNA because DNA

contains thymine in place of uracil.

4

Which one of the following statements about the monomers and polymers found in living organisms is FALSE?

During digestion monomers are joined together to make polymers which are then absorbed by the body.

5

Which of the following statements is/are true about dehydration synthesis?

A)All of the choices are correct.
B) Covalent bonds are formed between the monomers.
C) One monomer loses a hydrogen atom, and the other loses a hydroxyl group.
D) Electrons are shared between atoms of
the joined monomers.
E) H2O is formed as the monomers are joined.
ANSWER = A

6

The tertiary structure of a polypeptide refers to

the overall three-dimensional structure

7

The results of dehydration synthesis can be reversed by

hydrolysis

8

Proteins differ from one another because

the sequence of amino acids in the polypeptide chain differs from protein to protein.

9

Which list below consists of only polymers?

proteins, lipids, nucleic acids, polysaccharides

10

Hydrocarbons

contain only carbon and hydrogen atoms.

11

Which one of the following will not be affected by the denaturation of a protein?

the number of amino acids in the protein

12

Organic compounds :

always contain carbon.

13

One way to convert an oil into a substance that is solid at room temperature is to

chemically saturating the oil by adding hydrogens, decreasing the number of double bonds in the molecules.

14

Genetic information is encoded in the

sequence of nucleotides in DNA.

15

Carbon is able to form an immense diversity of organic molecules because of carbon's

A) ability to bond together to form extensive, branched, or unbranched "carbon skeletons."
B) capacity to form single and double bonds.
C) ability to bond with up to four other atoms.
D) tendency to form covalent bonds.
E) All of the choices are correct.

16

You now know that the old cliche "oil and water don't mix" is true. Why?

Water exhibits polarity and oil does not.

17

Amino acids can be distinguished from one another by

the chemical properties of their R groups.

18

In salad dressings, oil quickly separates from vinegar because oils are

nonpolar

19

Which one of the following is not the proper pairing of a polymer and its monomer?

triglyceride and steroid

20

Which one of the following is not a type of protein?

A) All of these are types of proteins.
B) signal proteins
C) enzymes
D) antibodies
E) contractile proteins

21

Sulfur has atomic number 16. How many single covalent bonds would you expect a sulfur atom to form?

2

22

Which of the following factors can result in the denaturation of a protein?

A) chemicals that destroy hydrogen bonds
B) heat
C) changes in salt concentration
D) changes in pH
E) All of the choices can result in the denaturation of a protein.

23

The __________ structure of a protein consists of a chain of amino acids assembled in a specific order.

PRIMARY

24

A phospholipid is composed of

one glycerol molecule linked to one phosphate group and two fatty acids

25

Cellulose differs from starch in that

most animals cannot break down cellulose, whereas starch is easily digested.

26

Which one of the following statements about animal cell lipids is false?

Many lipids function as enzymes

27

the building block for proteins

Amino acid

28

hydrophobic organic molecules containing just carbon and hydrogen

hydrocarbon

29

A type of lipid with 4 distinctive carbon rings. Many hormones related to reproduction are this type of lipid

sterol

30

fats and oils..this type of lipid contains glycerol and 3 fatty acids

triglyceride

31

this molecule contains a phosphate, five carbon sugar and a nitrogenous base and is the building block for DNA and RNA

nucleotide

32

a monomer for making cellulose and starch and glycogen

glucose

33

A protein containing more than one polypeptide chain exhibits the __________ level of protein structure.

quaternary

34

A hydroxyl group is

characteristic of alcohols

35

Which one of the following statements about the functional groups of organic compounds is false?

All functional groups include a carbon atom of the organic compound's skeleton.