Bio 2 Warm-up Quiz #3 (Fall 2014)

2.

Under a microscope, a series of cells are observed that lack membrane bound internal organelles. Which of these is the most likely cell type?

Plant cell
Animal cell
Eukaryotic cell
Prokaryotic cell

Correct Answer

A. Prokaryotic cell

Explanation

The most likely cell type in this scenario is a prokaryotic cell. Prokaryotic cells are characterized by their lack of membrane-bound organelles, such as a nucleus or mitochondria. They are typically found in bacteria and archaea. Plant and animal cells are examples of eukaryotic cells, which have membrane-bound organelles. Therefore, the absence of membrane-bound organelles suggests that the observed cells are prokaryotic.

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3.

Which of these supports the cell theory as it is stated today?

New cells are produced by division of existing cells.
All organisms are composed of more than one cell.
Cells must contain a nucleus.
Not all cells are alive.

Correct Answer

A. New cells are produced by division of existing cells.

Explanation

The statement "New cells are produced by division of existing cells" supports the cell theory as it is stated today. The cell theory states that all living organisms are composed of cells, cells are the basic unit of structure and function in living organisms, and new cells are produced from pre-existing cells. This statement aligns with the idea that new cells are formed through cell division, which is a fundamental process in the cell theory.

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4.

If energy is needed to move materials into or out of a cell, what is most likely occurring?

Osmosis
Active transport
Passive transport
Diffusion

Correct Answer

A. Active transport

Explanation

Active transport is the most likely process occurring when energy is needed to move materials into or out of a cell. Unlike passive transport, which relies on the concentration gradient to move molecules across the cell membrane, active transport requires the use of energy (usually ATP) to move molecules against the concentration gradient. This process is essential for the cell to maintain homeostasis and control the movement of specific molecules in and out of the cell.

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5.

Which most directly controls the rate at which food is broken down to release energy?

Enzymes
Nucleic acids
Hormones
Vitamins

Correct Answer

A. Enzymes

Explanation

Enzymes are proteins that act as catalysts in biochemical reactions. They speed up the rate at which food molecules are broken down into smaller molecules, such as glucose, to release energy. Enzymes achieve this by lowering the activation energy required for the reaction to occur. Without enzymes, the breakdown of food would be too slow to provide the necessary energy for cellular processes. Therefore, enzymes directly control the rate at which food is broken down to release energy.

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6.

Which function do structures X and Y have in common?

Digestion
Gathering Food
Movement
Reproduction

Correct Answer

A. Movement

Explanation

Both structures X and Y have the function of movement in common. This means that both structures are involved in the ability to move or change position. Movement is an essential function for organisms to navigate their environment, find food, escape predators, and carry out other necessary activities for survival.

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7.

Which would be the best evidence that a cell is using active transport to move a substance across its cell membrane?

Substances are moving rapidly across the cell membrane.
ATP is being rapidly consumed near the cellular membrane.
Substances are moving from high to low concentrations.
Substances are moving through channels in the cell membrane.

Correct Answer

A. ATP is being rapidly consumed near the cellular membrane.

Explanation

The best evidence that a cell is using active transport to move a substance across its cell membrane is the rapid consumption of ATP near the cellular membrane. Active transport requires energy in the form of ATP to move substances against their concentration gradient. The rapid consumption of ATP indicates that the cell is actively using energy to transport the substance across the membrane.

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8.

Cells are able to remove large amounts of material using __.

Endocytosis
Exocytosis
Phagocytosis
Osmosis

Correct Answer

A. Exocytosis

Explanation

Exocytosis is the process by which cells remove large amounts of material. During exocytosis, vesicles containing waste materials or cellular products fuse with the cell membrane and release their contents outside the cell. This allows cells to eliminate excess substances, such as toxins or metabolic waste, or to secrete molecules like hormones or enzymes. Endocytosis is the opposite process, where cells take in materials from the external environment. Phagocytosis is a type of endocytosis specifically used to engulf and digest large particles or pathogens. Osmosis, on the other hand, is the movement of water across a semipermeable membrane to equalize solute concentrations.

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9.

Which type of transport is shown in the diagram?

Passive transport
Active transport
Osmosis
Endocytosis

Correct Answer

A. Active transport

Explanation

The correct answer is Active transport. Active transport is a process in which molecules or ions move across a cell membrane against their concentration gradient, requiring the use of energy in the form of ATP. The diagram likely depicts a situation where molecules are being actively transported across the membrane, indicating the involvement of energy and the movement against the concentration gradient.

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10.

The difference in the concentration of dissolved particles from one location to another is called a ___.

Concentration gradient
Concentrated solution
Saline solution
Dynamic gradient

Correct Answer

A. Concentration gradient

Explanation

A concentration gradient refers to the difference in the concentration of dissolved particles between two locations. It represents how the concentration of particles changes or varies from one area to another.

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Bio 2 Warm-up Quiz #3 (Fall 2014)

Unlike prokaryotic cells, eukaryotic cells have the capacity to

Quiz Preview

Under a microscope, a series of cells are observed that lack membrane bound internal organelles. Which of these is the most likely cell type?

Which of these supports the cell theory as it is stated today?

If energy is needed to move materials into or out of a cell, what is most likely occurring?

Which most directly controls the rate at which food is broken down to release energy?

Which function do structures X and Y have in common?

Which would be the best evidence that a cell is using active transport to move a substance across its cell membrane?

Cells are able to remove large amounts of material using __.

Which type of transport is shown in the diagram?

The difference in the concentration of dissolved particles from one location to another is called a ___.