Angola 12th Grade Biology National Exam Practice Questions - Angola 12th Grade National Examination - Biology (Exame Nacional da 12.a Classe Biologia) Exam - Angola 12th Grade Biology National Exam Practice Questions - Angola 12th Grade National Examination - Biology (Exame Nacional da 12.a Classe Biologia) Exam

Question 1

Which statement correctly represents a core tenet of the classical Cell Theory formulated by Schleiden, Schwann, and Virchow?

All living organisms are composed of one or more cells, and all cells arise from pre-existing cells. Cells can spontaneously generate from non-living organic matter under anaerobic conditions. All cells possess a membrane-bound nucleus and compartmentalized membrane organelles. Viruses represent the most primitive independent cellular life forms capable of autonomous reproduction.

Correct Answer:

All living organisms are composed of one or more cells, and all cells arise from pre-existing cells.

Question 2

According to the Fluid Mosaic Model proposed by Singer and Nicolson, how is the eukaryotic plasma membrane organized?

A rigid protein monolayer sandwiched between two continuous carbohydrate sheets A phospholipid bilayer with hydrophobic tails facing inward and proteins embedded or attached dynamically A solid crystalline grid of cholesterol molecules surrounded by fixed peripheral glycoproteins A double layer of nucleic acids coated with structural polysaccharides and fibrous lipids

Correct Answer:

A phospholipid bilayer with hydrophobic tails facing inward and proteins embedded or attached dynamically

Question 3

How does simple diffusion differ fundamentally from facilitated diffusion across a biological membrane?

Simple diffusion requires ATP hydrolysis, whereas facilitated diffusion operates without metabolic energy. Simple diffusion moves solutes against their concentration gradient, whereas facilitated diffusion moves solutes down their gradient. Simple diffusion moves non-polar solutes directly through the lipid bilayer, whereas facilitated diffusion uses channel or carrier proteins. Simple diffusion only occurs in plant cells, whereas facilitated diffusion is restricted to animal cells.

Correct Answer:

Simple diffusion moves non-polar solutes directly through the lipid bilayer, whereas facilitated diffusion uses channel or carrier proteins.

Question 4

When a plant cell is placed in a strongly hypertonic sucrose solution, what physiological change is observed?

Water enters the vacuole, causing the cell to swell and eventually lyse. Solutes rapidly enter the cell, increasing turgor pressure against the primary cell wall. The cell wall degrades completely due to osmotic pressure, turning the cell into an animal-like sphere. Water exits the protoplast by osmosis, causing the plasma membrane to pull away from the cell wall (plasmolysis).

Correct Answer:

Water exits the protoplast by osmosis, causing the plasma membrane to pull away from the cell wall (plasmolysis).

Question 5

What is the stoichiometric action and primary biological consequence of the plasma membrane Na+/K+ ATPase pump?

Pumps 3 Na+ out of the cell and 2 K+ into the cell per ATP hydrolyzed, maintaining negative resting potential. Pumps 2 Na+ into the cell and 3 K+ out of the cell per ATP hydrolyzed, depolarizing the cell membrane. Pumps 3 Na+ and 3 K+ out of the cell simultaneously without using ATP, equilibrating electrical charge. Pumps 1 Na+ and 1 K+ in opposite directions by passive cotransport coupled with glucose diffusion.

Correct Answer:

Pumps 3 Na+ out of the cell and 2 K+ into the cell per ATP hydrolyzed, maintaining negative resting potential.

Question 1

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Prepare with the Angola 12th Grade Biology National Exam Practice Questions - Angola 12th Grade National Examination - Biology (Exame Nacional da 12.a Classe Biologia) Exam practice quiz. This question bank includes 100 questions covering human, cell, primary, blood, and biological. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Angola 12th Grade Biology National Exam Practice Questions - Angola 12th Grade National Examination - Biology (Exame Nacional da 12.a Classe Biologia) Exam

This practice set contains 100 questions from the matching question bank and focuses on human, cell, primary, blood, and biological. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

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Angola 12th Grade Biology National Exam Practice Questions - Angola 12th Grade National Examination - Biology (Exame Nacional da 12.a Classe Biologia) Exam

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