Biology Basics (Review Quiz)

When you step out into the cold, your body shivers in order to keep its temperature at 98.6F. Which characteristic of life does this represent?

• All living things use energy

• All living things contain cells

• All living things maintain homeostasis

• All living things grow

Answer explanation

This scenario illustrates homeostasis, as your body shivers to maintain a stable internal temperature of 98.6F despite external cold. This ability to regulate internal conditions is a key characteristic of all living things.

A camel has eyelashes that work to keep the dust and sand out of its eyes. Which characteristic of life does this represent?

• All living things adapt to their environment

• All living things grow

• All living things have cells

• All living things use energy

Answer explanation

The camel's eyelashes help it adapt to its sandy environment by keeping dust out of its eyes. This illustrates that all living things adapt to their environment, which is a key characteristic of life.

Rocks are not living because

• they never move

• they aren't needed for humans

• they are not made of cells

• they don't break down

Answer explanation

Rocks are not living because they are not made of cells. Living organisms are characterized by cellular structure, which rocks lack, making this the correct reason for their non-living status.

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The basic unit of structure and function in the human body is the....

• organ

• organ system

• cell

• tissue

Answer explanation

The basic unit of structure and function in the human body is the cell. Cells are the smallest living units that perform essential functions, making them fundamental to all biological processes.

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Which statement describes ALL living things?

• They are composed of one or more cells.

• They must reproduce sexually.

• They have organ systems to carry out the processes of life.

• They are capable of making their own food.

Answer explanation

All living things are composed of one or more cells, which is a fundamental characteristic. The other statements do not apply to all living organisms, as some reproduce asexually, lack organ systems, or cannot make their own food.

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A baby song bird hatches from its egg with both parent songbirds watching. Which characteristic of life does this represent?

• All living things reproduce

• All living things maintain homeostasis

• All living things use energy

• All living things grow

Answer explanation

The hatching of a baby songbird with both parents present illustrates reproduction, a fundamental characteristic of life. It shows that living organisms produce offspring, ensuring the continuation of their species.

The following are all characteristics of life EXCEPT:

• made of cell(s)

• eat food

• respond stimuli

• reproduce

Answer explanation

All living things are made of cells, respond to stimuli, and reproduce. However, not all organisms eat food; some, like plants, produce their own energy through photosynthesis. Therefore, 'eat food' is not a universal characteristic of life.

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Which characteristic is shown: A plant switches position and follows the sunlight throughout the day.

• Grow and develop

• Respond to a stimulus

• Acquire and use energy

• Reproduce

Answer explanation

The plant's ability to switch position and follow sunlight demonstrates its response to a stimulus, specifically light. This behavior is not about growth, energy use, or reproduction, but rather how it reacts to environmental changes.

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Which of these is not true about all organisms?

• all living things are multicellular

• all living things obtain and use energy

• all living things reproduce

Answer explanation

The statement "all living things are multicellular" is not true for all organisms, as many are unicellular, like bacteria and protozoa. The other statements about energy use and reproduction apply to all living things.

The following list represents characteristics of a living thing :

• made of cells, has lungs, can reproduce

• made of cells, grows and develops, uses energy

• has similar chemicals, makes noises, made of cells

Answer explanation

The correct choice, 'made of cells, grows and develops, uses energy', includes essential characteristics of living things. All living organisms are cellular, undergo growth and development, and require energy to sustain life.

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