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GED Science — practice by topic

Browse 22 questions across 1 Science topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Cell Structure (22)

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The human body is compared to a brick wall. What plays the part of a single brick?Read the answer and worked solution →A living thing, whether it has one cell or many cells, is called what?Read the answer and worked solution →What is the most effective action anyone can take to prevent the spread of contagious illnesses?Read the answer and worked solution →A prokaryote is a simple, mostly single-celled organism that lacks which structure?Read the answer and worked solution →

Worked practice questions

The human body is compared to a brick wall. What plays the part of a single brick?

  1. A cell
  2. A bone
  3. An organ
  4. A protein
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Correct answer: A. A cell

1. A brick wall is built from one repeating unit, the brick. 2. The body is likewise built from basic building blocks, and those blocks are cells. 3. Bones and organs are themselves made of many cells, so they are the wall, not the brick. _Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 4 "Cell Structure", section 4.1 Studying Cells_

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A living thing, whether it has one cell or many cells, is called what?

  1. An organelle
  2. An organism
  3. A microbe
  4. An antibody
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Correct answer: B. An organism

1. Bacteria live as a single cell, while humans are made of many cells; both are alive. 2. Any living thing, one-celled or many-celled, is called an organism. 3. An organelle is a small part inside one cell, far below the level of a whole living thing. _Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 4 "Cell Structure", section 4.1 Studying Cells_

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What is the most effective action anyone can take to prevent the spread of contagious illnesses?

  1. Taking antibiotics
  2. Wearing eyeglasses
  3. Washing the hands
  4. Avoiding raw fruit
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Correct answer: C. Washing the hands

1. Microbes are everywhere: on doorknobs, money, hands, and many other surfaces. 2. The most effective action anyone can take against contagious illness is washing his or her hands. 3. Touching your mouth, nose, or eyes with unwashed hands lets those microbes into the body. _Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 4 "Cell Structure", section 4.2 Prokaryotic Cells_

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