Questions and Answers Metabolism Photosynthesis

1. Type of energy used by autotrophic organisms that includes the movement of photons:
Almost all the energy that comes from the environment and is used by organisms comes from the sun, whose light energy is used by photoautotrophic organisms for photosynthesis.
2. The first law of thermodynamics states that:
A) Chemical energy is transformed into photonic energy.
B) Energy is transformed only in a closed system.
C) The total amount of energy remains constant.
D) Energy flows from places of low concentration to those of high concentration.
E) Energy is modified but no work is done.
The first law of thermodynamics or law of conservation of energy established by Joule and Prescott whose basic principle is: energy is neither created nor destroyed, it is only transformed.
3. The reactions to light, photosynthesis, are carried out at the level of:
The thylakoids are disc-shaped membranes where the light-capturing photopigments are found for the photochemical reactions that take place in photosynthesis.

RPTA.: B

4. Metabolic mechanism that does not correspond to the light phase of photosynthesis:
C) Cyclic oxidative phosphorylation
D) Non-cyclic oxidative phosphorylation.
Fixation takes place in the chloroplast stroma during the dark phase of photosynthesis and is the compound necessary for the synthesis of organic biomolecules such as carbohydrates.
5. The final products of the Hill reaction in photosynthesis are:

SOLUTION

The Hill reaction is the chemical expression of water photosynthesis, one of whose products, , is released into the environment and used in the respiration of all living beings.
6. The hydrogen needed to form glucose during photosynthesis is transported by:

SOLUTION

Hydrogen is transported by the coenzyme NADP, in the form of NADPH + H from the light phase to the dark phase, which intervenes in said phase for the synthesis of organic molecules.
7. The synthesis of glucose in the dark phase of photosynthesis requires the prior synthesis of:

A) ADP

The synthesis of glucose is carried out after the Calvin cycle which begins with the oxidation of ribulose to ribulose mono and diphosphate consecutively to give rise to organic biomolecules.
8. In which part of the chloroplast does the fixation and synthesis of organic compounds take place:
The binding of ribulose diphosphate and the subsequent synthesis of organic compounds are carried out during the dark phase of photosynthesis which takes place in the stroma of the chloroplast.
9. It is not an activity of photosynthesis:
C) Alcoholic fermentation.
E) Reduction of NADP to .
Alcoholic fermentation is considered a type of anaerobic respiration, carried out by certain species of yeast giving ethyl alcohol and ethyl alcohol as final products.
10. The quantasomes are the photosynthetic units at the level of which:
B) Formation of phosphoglyceraldehyde
C) Blackman’s reaction
The photosynthetic pigments integrated into the membranes of the thylakoids constitute photosynthetic units called quantosomes. These pigments are responsible for capturing light energy at different wavelengths.
11. In the light phase of photosynthesis, the following does not occur:



SOLUTION

Carbon dioxide is composed of both water and air and is fixed during the Calvin cycle for the biosynthesis of organic compounds.
12. Which of the following processes does not correspond to the Calvin cycle:
A) NADPH + H and ATP are used
B) It is assimilated from the environment.
C) There is synthesis of phosphoglyceral-dehyde
D) Pentoses (ribulose) are regenerated
Photophosphorylation is a process that takes place during the light phase of photosynthesis and consists of the formation of ATP (Adenosine-triphosphate) from ADP and Pi (inorganic phosphorus).
13. An event that occurs in the photophase is:
B) Water Production and
C) Production of NADPH+H and ATP
D) Release of from ribulose
The products of the light phase or photophase that are used in the dark phase are NADPH + H, which acts as an electron carrier, and the energy from ATP for the synthesis of organic molecules.
14. Molecule to which is fixed in the Calvin cycle is called:
After being phosphorylated, ribulose is converted to ribulose diphosphate, a reaction catalyzed by the enzyme ribulose diphosphate carboxylase, to give an unstable 6-carbon sugar or hexose.
15. Photosynthesis is a process that takes place in the Kingdoms:
Photosynthesis is a process that takes place in autotrophic organisms with chlorophyll among other endogenous factors, such as plants and algae that belong to the Kingdom Protista.
16. Which compound is not used in the light phase of photosynthesis:
C) Electron transport system
Oxygen is not used, rather it is released in the light or light phase from a process called photolysis of water.

17. Chlorophylls are photopigments that are located in:
The thylakoids are discoidal membranes that are grouped in the grains and the light-capturing photopigments for the photochemical phase are located there.
18. Hemoglobin is a porphyrin pigment with the presence of iron while chlorophyll is a porphyrin pigment with the presence of:
Magnesium is a metal that is part of the chlorophylls, joining the pyrrolic rings of the porphyrin nucleus, which also provides the characteristic green color of the chlorophylls of organisms.
19. In the formation of a glucose molecule, the following is used:

SOLUTION

Hexoses like glucose require 6 carbon atoms among others for their formation, this means that if 1 is fixed for each Calvin cycle, the 6 carbons (one per ) will be fixed in 6 Calvin cycles.
20. Plant tissue in which photosynthesis takes place:
All endogenous factors for photosynthesis (pigments, enzymes, coenzymes) are located in the corrophyllous parenchyma or chlorenchyma such as herbaceous stems.

RPTA.: D