Alevels Biology MCQ Quiz
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- 1.
What does resolution mean?
- A.
Ablity to view an object clearly
- B.
Ability to view an object enlarged
- C.
Ability to distinguish between two close objects
- D.
Ability to view an object
Correct Answer
C. Ability to distinguish between two close objectsExplanation
Resolution refers to the ability to distinguish between two close objects. It is a measure of the level of detail that can be seen in an image or displayed on a screen. A higher resolution means that smaller details can be distinguished, while a lower resolution may result in blurry or pixelated images where close objects merge together. Therefore, the correct answer is the "ability to distinguish between two close objects."Rate this question:
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- 2.
Which orgenelle supports in active transport?
- A.
Centriole
- B.
Centromere
- C.
Mitochondria
- D.
Lysosome
Correct Answer
C. MitochondriaExplanation
Mitochondria support active transport. Active transport is the movement of molecules across a cell membrane against their concentration gradient, requiring energy. Mitochondria are the powerhouses of the cell, producing ATP, which is the energy currency of the cell. They provide the necessary energy for active transport processes to occur, such as the pumping of ions or the uptake of nutrients.Rate this question:
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- 3.
Which process does not require energy?
- A.
Endocytosis
- B.
Diffusion
- C.
Exocytosis
- D.
Pinoytosis
Correct Answer
B. DiffusionExplanation
Diffusion is the process in which molecules or particles move from an area of higher concentration to an area of lower concentration. This movement occurs naturally and does not require any energy input. Therefore, diffusion is the correct answer as it is the only process listed that does not require energy. Endocytosis, exocytosis, and pinocytosis are all active processes that involve the use of energy to transport substances across cell membranes.Rate this question:
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- 4.
What is tertiary structure of a protien?
- A.
The sequence of amino acid bases in the structure
- B.
The structure has beta pleated sheets
- C.
It has four polypeptide chains
- D.
The structure has hydrophilic and hydrophobic regions
Correct Answer
D. The structure has hydropHilic and hydropHobic regionsExplanation
The tertiary structure of a protein refers to its three-dimensional arrangement, which is crucial for its function. One of the key features of this structure is the presence of hydrophilic and hydrophobic regions. These regions determine how the protein interacts with its environment, as hydrophilic regions tend to be exposed to water while hydrophobic regions are buried within the protein. This arrangement allows the protein to fold into a compact and stable shape, enabling it to perform its specific biological functions effectively.Rate this question:
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- 5.
As a frozen lake warms after a cold winter, mineral nutrients are brought to the surface.which property of water best contributes to this?
- A.
High specific heat capacity
- B.
Its molecules form hydrogen bonds
- C.
It is a solvent
- D.
Its greatest density is at 4 C
Correct Answer
D. Its greatest density is at 4 CExplanation
Water has a unique property where its density increases as it cools down until it reaches 4 degrees Celsius. As the temperature drops below 4 degrees Celsius, water molecules start to form a lattice-like structure, causing the density to decrease. This property is crucial for the survival of aquatic organisms during winter. When the frozen lake warms up, the ice starts to melt, and the water molecules rearrange themselves, resulting in water with a density higher than the surrounding water. This causes the nutrient-rich water at the bottom of the lake to rise to the surface, providing essential minerals for the ecosystem.Rate this question:
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- 6.
Wat is common in prokaryotes and eukaryotes?
- A.
Ribosomes
- B.
Cell walls
- C.
Mesosomes
- D.
DNA
Correct Answer
A. RibosomesExplanation
Ribosomes are the common feature in both prokaryotes and eukaryotes. Ribosomes are responsible for protein synthesis in cells. They are composed of RNA and protein molecules and are found in the cytoplasm of both prokaryotic and eukaryotic cells. While there are differences in the structure and organization of ribosomes between prokaryotes and eukaryotes, they both play a crucial role in protein production. Therefore, ribosomes are the correct answer as they are shared by both types of cells.Rate this question:
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Apr 16, 2024Quiz Edited by
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May 20, 2010Quiz Created by
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