KAHOOT EXAM 2

Question 1

When an enzyme changes shape to promote a reaction it enters the:

a) Intermediate state
b) Catalyzing state
c) Transformation state
d) Transition state

Answer 1

d) Transition state

Question 2

What is the primary function of enzymes in biological systems?

a) To store energy
b) To transport molecules across cell membranes
c) To catalyze biochemical reactions
d) To provide structural support to cells

Answer 2

c) To catalyze biochemical reactions

Question 3

The Great Oxidation Event gave rise to:

a) Photosynthetic organisms
b) Gymnosperms
c) The first single-celled organisms
d) Eukaryotes

Answer 3

d) Eukaryotes

Question 4

The leaves of deciduous change colour in fall because:

a) anthocyanin production ramps up
b) Chlorophylls are recycled
c) Less common accessory pigments become visible
d) All of the above

Answer 4

d) All of the above

Question 5

In the light-dependent reactions of photosynthesis, water gives up its electrons to:

a) Coenzyme Q (CoQ)
b) Photosystem I
c) Photosystem II
d) ATP synthase

Answer 5

c) Photosystem II

Question 6

In the light-independent reactions of photosynthesis, CO2 and RuBP are combined with the help of:

a) Adenosine diphosphate
b) Alcohol dehydrogenase
c) Rubisco
d) Hexokinase

Answer 6

c) Rubisco

Question 7

In aerobic cellular respiration, where does glycolysis occur?

a) Mitochondrial matrix
b) Cytoplasm
c) Inner mitochondrial membrane
d) Nucleus

Answer 7

b) Cytoplasm

Question 8

The (net) yield of glycolysis is:

a) 2 ATP and 2 NADPH
b) 2 ATP and 2 NADH
c) 4 ATP and 2 NADH
d) 2 ATP and 4 NADPH

Answer 8

b) 2 ATP and 2 NADH

Question 9

Where does the Calvin cycle, a part of photosynthesis, take place?

a) Thylakoid membrane
b) Stroma of chloroplasts
c) Mitochondrial matrix
d) Cytoplasm of the cell

Answer 9

b) Stroma of chloroplasts

Question 10

When an enzyme is deactivated to “turn off” a metabolic pathway, it is called:

a) Positive feedback loop
b) Feedback inhibition
c) Competitive inhibition
d) Negative catalysis

Answer 10

b) Feedback inhibition

Question 11

The Haber Process is an example of biological catalysis

Vrai
Faux

Answer 11

false, environmental??

Question 12

Ethanol blocking methanal’s binding to alcohol dehydrogenase is reversible competitive inhibition

Vrai
Faux

Answer 12

true

Question 13

The step of aerobic cellular respiration that requires oxygen is:

a) Carbon fixation
b) The Calvin cycle
c) The Krebs cycle
d) Electron transfer phosphorylation

Answer 13

d) Electron transfer phosphorylation

Question 14

Which of the following is NOT a characteristic of enzymes?

a) They lower activation energy
b) They are consumed during the reaction
c) They exhibit specificity for their substrates
d) They can be regulated by environmental factors

Answer 14

b) They are consumed during the reaction

Question 15

Autotrophs obtain their carbon via:

a) Inorganic forms
b) Sugars
c) Sunlight
d) Organic forms

Answer 15

a) Inorganic forms

Question 16

After consuming glucose, it enters the blood, then enters cells via
a) Gluts
b) Diffusion
c) Voltage-gated channels
d) The electron transport chain (ETC)

Answer 16

a) Gluts

Question 17

The longer the wavelength of electromagnetic radiation, the more energy it carries

True
False

Answer 17

False

Question 18

According to the first law of thermodynamics, energy:

a) Can be created but not destroyed
b) Cannot be created or destroyed, only transformed
c) Can only be converted into kinetic energy
d) Can be converted into matter

Answer 18

b) Cannot be created or destroyed, only transformed

Question 19

In the NAD+ Regeneration stage of Lactic Acid fermentation, 1 carbon from pyruvate is released as CO2

True
False

Answer 19

false, its 2

Question 20

The synthesis of acid hydrolases in lysosomes is an example of:

a) Inactive enzyme synthesis
b) Allosteric inhibition
c) Feedback inhibition
d) Lock-and-key substrate binding

Answer 20

a) Inactive enzyme synthesis

Question 21

What is the product of the Calvin cycle?

a) ATP and NADPH
b) ATP and NADH
c) PGAL
d) Glucose

Answer 21

c) PGAL

Question 22

When a molecule loses an electron(s), it is reduced.

True
False

Answer 22

False LE0=oxidized

Question 23

In aerobic cellular respiration, 1 glucose produces a total of:

a) 30 ATP
b) 12 ATP
c) 36 ATP
d) 32 ATP

Answer 23

32 ATP

Question 24

The “Allo” in Allosteric refers to:

a) The posterior end
b) The anterior end
c) Chemical bonding
d) Other than

Answer 24

d) Other than

Question 25

In Electron Transfer Phosphorylation, what is the common electron acceptor for both Complex I and II?

a) Oxygen
b) Coenzyme A (CoA)
c) Cytochrome C (CytC)
d) Coenzyme Q (CoQ)

Answer 25

d) Coenzyme Q (CoQ)

Question 26

In the Citric Acid cycle, what is the name of the 6-carbon sugar?

a) Oxaloacetate
b) Glucose
c) Citrate
d) Acetyl-group

Answer 26

c) Citrate

Question 27

The most common photosynthetic pigment is:

a) Beta-carotene
b) Chlorophyll a
c) Chlorophyll b
d) Dr. Phyll M.D.

Answer 27

b) Chlorophyll a