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GED Science Test #8 3 Flashcards

6 cards from real GED practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 GED Science Test #8 3 flashcards as text

  1. Which describes the role of ribosomes in a cell?

    Answer: Synthesizing proteins from amino acids

    Ribosomes are the sites of protein synthesis. They read mRNA sequences and assemble amino acids in the correct order to build proteins. Ribosomes can be free in the cytoplasm or attached to the rough ER.

  2. What does the term "biodiversity" refer to?

    Answer: The variety of species and genetic diversity within an ecosystem

    Biodiversity refers to the variety of life forms — including species diversity, genetic diversity, and ecosystem diversity. High biodiversity generally increases ecosystem stability and resilience.

  3. A catalyst in a chemical reaction:

    Answer: Speeds up the reaction without being consumed

    A catalyst lowers the activation energy of a reaction, speeding it up, but is not consumed in the process. Enzymes are biological catalysts that control metabolism in living organisms.

  4. The diagram shows a wave with a wavelength of 4 m and 2 complete cycles occurring per second. What is the wave's speed?

    Answer: 8 m/s

    Wave speed = wavelength × frequency = 4 m × 2 Hz = 8 m/s. The frequency is 2 cycles per second (2 Hz), and the wavelength is 4 m.

  5. Which of the following human activities most directly contributes to the loss of biodiversity?

    Answer: Habitat destruction and deforestation

    Habitat destruction is the leading cause of biodiversity loss. When natural habitats are cleared for agriculture, development, or logging, species lose their homes and food sources, often leading to extinction.

  6. A chemical equation is balanced when:

    Answer: Both A and B are correct

    A balanced chemical equation satisfies the Law of Conservation of Mass: atoms are neither created nor destroyed. This means both the number of atoms AND the total mass must be equal on both sides of the equation.