Quiz 1

Question 1

Due to the lack of an enzyme to break down lipids, excess accumulation of lipids in the brain leads to a human disease called Tay Sachs. Which organelle is likely to be the one that lacks the proper enzyme needed for lipid breakdown?

Answer 1

lysosome

Question 2

Which organelle stores water, ions, and functions in cell elongation during growth of a plant cell?

Answer 2

Vacuole

Question 3

The outer membrane of the nuclear envelope often has bound ribosomes. What can you conclude from this?

Answer 3

at least some of the proteins that function in the nuclear envelope are made by the ribosomes on the nuclear envelope.

Question 4

Which contains oxidase enzymes and is involved in detoxification reactions?

Answer 4

peroxisome

Question 5

Thylakoids, stoma, and ribosomes are all components found in

Answer 5

chloroplasts

Question 6

The nucleus is to eukaryotes as the ________ is to prokaryotes.

Answer 6

nucleoid

Question 7

Which of the following is true for all exergonic reactions?

Answer 7

The reaction proceeds with a net release of free energy.

Question 8

How can one increase the rate of a chemical reaction?

Answer 8

Add a catalyst.

Question 9

When one hydrogen atom shares a pair of electrons with another hydrogen atom, H2 is formed via a(n)

Answer 9

single covalent bond

Question 10

The nucleus of an atom is composed of

Answer 10

protons and neutrons

Question 11

Carbon and hydrogen have similar electronegativities and combine together to form hydrocarbon molecules. What type of bonds form between these atoms?

Answer 11

nonpolar covalent

Question 12

Amphipathic molecules

Answer 12

possess both hydrophilic and hydrophobic properties.

Question 13

A grave consequence of uncontrolled fever can be:

Answer 13

change in the tertiary structure of your enzymes

Question 14

Enzymes are biological catalysts that enhance the rate of a reaction by:

Answer 14

decreasing the activation energy.

Question 15

The active site of an enzyme is the region that

Answer 15

is involved in the catalytic reaction of the enzyme

Question 16

The tertiary structure of a protein is dependent on

Answer 16

the side chain composition of each amino acid within the protein.

Question 17

Which factor is responsible for inhibiting a metabolic process by feedback?

Answer 17

end product

Question 18

A noncompetitive inhibitor decreases the rate of an enzyme reaction by:

Answer 18

changing the shape of the enzyme’s active site

Question 19

By increasing the substrate concentration in an enzymatic reaction, one could overcome which of the following?

Answer 19

competitive inhibition

Question 20

The __________ is a measure of the affinity of an enzyme for its substrate and is the substrate concentration that yields half-maximal reaction rate.

Answer 20

Km

Question 21

The ________________ bonds between the side chains of cysteine residues in some proteins covalently link regions of proteins, thus restricting the proteins’ flexibility and increasing the stability of their tertiary structures.

Answer 21

Disulfide

Question 22

________________ bond is the covalent linkage established between 2 monosaccharide residues when they come together to form a disaccharide.

Answer 22

Glycosidic

Question 23

Total genetic information carried by a cell or an organism is known as _________.

Answer 23

Genome

Question 24

Proteins that have a common ancestor are referred to as ________________.

Answer 24

Homologs