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Quiz

front 1

Which of the following descriptions best fits the class of molecules known as nucleotides?

back 1

a nitrogenous base, a phosphate group, and a pentose sugar

front 2

A molecule with the formula C18H36O2 is probably a

back 2

fatty acid.

front 3

Which of the following statements best summarizes the differences between DNA and RNA?

back 3

DNA nucleotides contain a different sugar than RNA nucleotides.

front 4

What aspects of protein structure are stabilized or assisted by hydrogen bonds?

back 4

secondary, tertiary, and quaternary structures, but not primary structure

front 5

Which class of biological molecules are grouped together because they are hydrophobic?

back 5

lipids

front 6

Which class of biological molecules are grouped together because their monomers are amino acids?

back 6

proteins

front 7

What is the structural feature that allows DNA to replicate?

back 7

complementary pairing of the nitrogenous bases

front 8

Molecules with which functional groups may form polymers via dehydration reactions?

back 8

either hydroxyl or carboxyl groups

front 9

If cells are grown in a medium containing radioactive 15N, which of these molecules will be labelled?

back 9

both proteins and nucleic acids

front 10

The basis for diversity, both within a species and among species, is a result of the

back 10

arrangement of a few base molecules into many different macromolecular combinations.

front 11

The following questions are based on the 15 molecules illustrated in the figure below. Each molecule may be used once, more than once, or not at all.

Which of the following molecules consists of a hydrophilic "head" region and a hydrophobic "tail" region?

back 11

5

front 12

Which of the following molecules could be joined together by a phosphodiester type of covalent bond?

back 12

11 and 12

front 13

Which of the following molecules could be joined together by a peptide bond as a result of a dehydration reaction?

back 13

7 and 8

front 14

Which of the following molecules act as building blocks (monomers) of polypeptides?

back 14

2,7, and 8

front 15

Which of the following statements is/are true regarding the chemical reaction illustrated in the figure above?

back 15

It results in a peptide bond.

front 16

Which of the following is an example of hydrolysis?

back 16

the reaction of a fat, forming glycerol and fatty acids with the consumption of water

front 17

Which level of protein structure do the α helix and the β pleated sheet represent?

back 17

secondary

front 18

If cells are grown in a medium containing radioactive 35S, which of these molecules will be labelled?

back 18

proteins

front 19

If a DNA sample were composed of 10% thymine, what would be the percentage of guanine?

back 19

40

front 20

Which of the following are nitrogenous bases of the pyrimidine type?

back 20

cytosine and uracil

front 21

Which bonds are created during the formation of the primary structure of a protein?

back 21

peptide bonds

front 22

At which level of protein structure are interactions between the side chains (R groups) most important?

back 22

tertiary

front 23

Which of the following are nitrogenous bases of the purine type?

back 23

guanine and adenine

front 24

The tertiary structure of a protein is the

back 24

unique three-dimensional shape of the fully folded polypeptide.

front 25

Which of the following is true of cellulose?

back 25

It is a major structural component of plant cell walls.

front 26

Which of these classes of biological molecules consist of both small molecules and macromolecular polymers?

back 26

carbohydrates

front 27

The amino acids of the protein keratin are arranged predominantly in an α helix. This secondary structure is stabilized by

back 27

hydrogen bonds.

front 28

Normal hemoglobin is a tetramer, consisting of two molecules of β hemoglobin and two molecules of α hemoglobin. In sickle-cell disease, as a result of a single amino acid change, the mutant hemoglobin tetramers associate with each other and assemble into large fibres. Based on this information alone, we can conclude that sickle-cell hemoglobin exhibits

back 28

altered primary structure and altered quaternary structure; the secondary and tertiary structures may or may not be altered.

front 29

The enzyme amylase can break glycosidic linkages between glucose monomers only if the monomers are the α form. Which of the following could amylase break down?

back 29

glycogen

front 30

Which of the following polymers contain nitrogen?

back 30

chitin