Single-Celled Organisms

Question 1

Which statement most accurately contrasts how a unicellular organism such as an amoeba meets its needs for nutrition, movement, and waste removal compared with a multicellular organism such as a rabbit?

Accepted Answer

The amoeba takes in food particles by engulfing them with its cell membrane and moves by changing its shape, while the rabbit digests food in a stomach, moves using muscles attached to bones, and eliminates waste through kidneys and an anus.

Answer

Both the amoeba and the rabbit obtain nutrients by breaking down complex foods inside specialized digestive organs, but the amoeba moves by swimming with a tail while the rabbit hops using its legs.

Answer

The amoeba performs all life processes inside its single cell, so it does not need specialized organs; the rabbit also performs all processes inside one cell, just organized into different tissues.

Answer

The amoeba gets energy by absorbing sunlight directly through its cell wall, and it moves by growing new cells at one end, while the rabbit relies on chewing plants and walking on its feet.

Question 2

Which statement best describes how a unicellular organism carries out the life process of nutrition?

Accepted Answer

It absorbs nutrients directly across its cell membrane through diffusion or active transport.

Answer

It receives nutrients from neighboring cells through a shared vascular network.

Answer

It transports nutrients to its tissues using a circulatory system.

Answer

It breaks down food in a specialized stomach before the nutrients enter the cell.

Question 3

Which statement accurately explains how a unicellular organism carries out the excretion function of life?

Accepted Answer

It removes metabolic waste directly across its cell membrane by diffusion.

Answer

It stores waste in a specialized excretory organ inside the cell.

Answer

It releases waste only after the cell bursts when it dies.

Answer

It converts waste products into sugars using chloroplasts.

Try three questions

Which statement most accurately contrasts how a unicellular organism such as an amoeba meets its needs for nutrition, movement, and waste removal compared with a multicellular organism such as a rabbit?

Which statement best describes how a unicellular organism carries out the life process of nutrition?

Which statement accurately explains how a unicellular organism carries out the excretion function of life?

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