Question 1

A single ADP molecule comprises of adenine, ribose, and a 2 chained phosphate group. Which of the following best describes the removal of a hydrogen molecule to accommodate the addition of inorganic phosphate to ADP to form the energy currency of cells, ATP.

Accepted Answer

It is an endergonic process and a dehydration reaction.

Answer

It is an exergonic process and a dehydration reaction.

Answer

It is an endergonic process and a hydrolysis reaction.

Answer

It is an exergonic process and a hydrolysis reaction.

Question 2

Which of the following are the electron carriers of cellular respiration?

Accepted Answer

NADH and FADH2

Answer

NADPH and FADH2

Answer

NADPH and ATP

Answer

NADH2 and FADH

Question 3

How much ATP does a single FADH2 produce on cellular respiration.

Accepted Answer

2 ATP

Answer

4 ATP

Answer

6 ATP

Answer

3 ATP

Question 4

How much ATP does a single NADH produce on cellular respiration.

Accepted Answer

3 ATP

Answer

6 ATP

Answer

2 ATP

Answer

4 ATP

Question 5

During Glycolysis, 2 molecules of NADH and 2 molecules of pyruvates are produced. How much ATP is produced from the those 2 electron carriers produced?

Accepted Answer

6 ATP

Answer

3 ATP

Answer

4 ATP

Answer

8 ATP

Question 6

A single Krebs Cycle produces 3 NADH and 1 FADH2. What is the total amount of ATP produced only from the electron carriers assembled from a single Krebs Cycle?

Accepted Answer

11 ATP

Answer

12 ATP

Answer

24 ATP

Answer

22 ATP

Question 7

How many Krebs cycles are there in a single process of cellular respiration?

Accepted Answer

2

Answer

3

Answer

1

Answer

4

Question 8

Acetyl CoA is an important molecule in the process of cellular respiration. At what stage of cellular respiration is it usually found?

Accepted Answer

Krebs Cycle

Answer

Carbon Fixation

Answer

Glycolysis

Answer

Calvin Cycle

Question 9

During respiration of yeasts, the pyruvate is fermented into alcohol instead of undergoing Krebs Cycle. Which of the following best describes the main cause of such phenomenon?

Accepted Answer

There is no oxygen that will be the drive for electrons to undergo Krebs Cycle and ETC.

Answer

There is a lack of electron carriers produced during glycolysis in which the yeast cells rely to fermentation instead to continue energy metabolism.

Answer

Yeasts are primarily designed to ferment and produce alcohol regardless of environmental conditions

Answer

There is an insufficient amount of coenzyme A which the pyruvates from glycolysis will not be able to combine with to form acetyl CoA, which is an important molecule on the Krebs Cycle.

Question 10

The electron transport chain in cellular respiration directly produces ATP.

Accepted Answer

false

Answer

true

Question 11

How is water produced in the final stage of cellular respiration?

Accepted Answer

The oxygen as the final electron acceptor combines with the hydrogen ions that are deposited by electron carriers.

Answer

As ATP is produced through the ATP Synthase, some of the energy are expended to synthesize water from the accumulation of hydrogen ions.

Answer

The hydrogen ion accumulation between the inner and outer membrane combines with oxygen that moves from molecule to molecule.

Answer

Nicotinamide Adenine Dinucleotide Hydrogen breaks into H2O during the electron transport chain as it deposits its electrons.

Question 12

Which of the following is not a product of the Krebs Cycle?

Accepted Answer

CO2

Answer

FADH2

Answer

ATP

Answer

NADPH

Question 13

Which of the following is NOT true about alcoholic fermentation?

Accepted Answer

There are no electron carriers to deposit hydrogen ions to ETC.

Answer

Only certain organisms can undergo alcoholic fermentation.

Answer

It produces ATP in small amounts compared to normal respiration

Answer

Pyruvates are converted to acetaldehyde which are reduced to ethanol by NADH.

Question 14

A boy gets sore muscles due to continuously running around without rest. Which of the following best describes the scenario?

Accepted Answer

Running continually deprives us of oxygen which results to our cells depending on lactic acid fermentation instead, thus, damaging muscle tissues.

Answer

Getting exhausted causes our cells to undergo alcoholic fermentation as there is no oxygen as the final electron acceptor.

Answer

Getting exhausted prevents our cells from undergoing cellular respiration.

Answer

Running without rest exhausts us of oxygen which results to our muscle cells dying.

Question 15

Photosynthesis is a type of what process?

Accepted Answer

Anabolic and Endergonic

Answer

Anabolic and Exergonic

Answer

Catabolic and Endergonic

Answer

Catabolic and Exergonic

Question 16

Which of the following chemical formulas for photosynthesis is correct?

Accepted Answer

6CO2 + 6H2O ==> C6H12O6 + 6O2

Answer

6CO2 + 6O2 ==> C6H12O6 + 6H2O

Answer

C6H12O6 + 6O2==> 6CO2 + 6H2O

Answer

C6H12O6 + 6H2O ==> 6CO2 + 6O2

Question 17

Photoautotrophs are organisms that are light feeding and self feeding. Which of the following is a photoautotrophic organism?

Accepted Answer

Cyanobacteria

Answer

Prion

Answer

Yeasts

Answer

Fungus

Question 18

Which of the following is NOT true about chlorophylls?

Accepted Answer

It is concentrated within the stroma

Answer

It reflects green light.

Answer

It absorbs red and blue light.

Answer

It is important for plant metabolism

Question 19

Which of the following is the correct order of stages in photosynthesis?

Question 20

Which of the following is true about Photosystem II?

Accepted Answer

Water undergoes photolysis in this stage

Answer

P700 is its reaction center

Answer

It mostly contains chlorophyll A

Answer

Excited electrons attach to NADP to form NADPH in this stage

Question 21

The light reaction also produces ATP as water is photolyzed and is split into hydrogen ions which pass through the ATP synthase.

Accepted Answer

true

Answer

false

Question 22

Which of the following are the electron carriers of photosynthesis?

Accepted Answer

NADPH and ATP

Answer

NADH and FADH2

Answer

NADH and FADPH

Answer

NADH2 and ATP

Question 23

What light reaction electron flow does the plant undergo in order to produce lots of ATP to accommodate sufficient amounts of energy needed in the Calvin cycle?

Accepted Answer

Cyclic

Answer

Non-cyclic

Answer

Acyclic

Answer

Recyclic

Question 24

What compound enters the Calvin cycle and combines with RUBP with the help of RUBISCO to form 3-PGA?

Accepted Answer

Carbon dioxide

Answer

NADPH

Answer

Oxygen

Answer

ATP

Question 25

Which of the following is the correct chemical formula for carbon fixation?

Accepted Answer

CO2 + RUBP --RUBISCO--> 3-PGA

Answer

CO2 + NADPH --RUBISCO--> 3-PGA

Answer

NADPH + RUBP --RUBISCO--> G3P

Answer

G3P + RUBP --RUBISCO--> 3-PGA

Question 26

What compound in the Calvin cycle either exits the cycle to form glucose or forms another RUBP to be used in another cycle

Accepted Answer

G3P

Answer

3-PGA

Answer

RUBISCO

Answer

NADH

Question 27

Wheat undergoes Calvin Cycle at the pattern of RUBP and CO2 combining to form 3-PGA. In hot and dry conditions, wheat dies out due to water loss as they are ill equipped with adaptations. What type of plant are they based on their Calvin Cycle pathway?

Accepted Answer

C3

Answer

C5

Answer

C4

Answer

CAM

Question 28

Pineapple is a type of CAM plant that has adapted to hot and arid conditions by opening their stomata during nighttime and closing otherwise. What adaptation do they have?

Accepted Answer

Temporal

Answer

Stomatic

Answer

Spatial

Answer

Climactic

Question 29

Which of the following is true about C3 plants on hot and arid conditions?

Accepted Answer

RUBISCO acts as oxygenase rather than carboxylase due to the lack of carbon dioxide, which have risen high above the atmosphere.

Answer

Calvin Cycle is halted until the said conditions go away, which is during night time

Answer

Calvin Cycle mostly happens at their Kranz anatomy which helps them continue the cycle at hot and arid conditions.

Answer

RUBISCO acts as carboxylase due to an increased amount of carbon dioxide from the hot conditions.

Question 30

How does cacti survive in the desert?

Accepted Answer

They have temporal adaptation which have their stomata open during nighttime and closed during daytime.

Answer

Their RUBISCO always acts as carboxylase regardless of temperature.

Answer

They have spatial adaptation as they have a unique anatomy called Kranz anatomy where Calvin Cycle mostly occurs.

Answer

Cacti can produce 3-PGA without RUBISCO, thus the possibility of RUBISCO acting as oxygenase is nonexistent.

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