Unit 2 Investigation 6: Why do cells need energy?

Cells STORE & RELEASE energy because:

• they need to perform various functions.

• they want to grow larger.

• they need to change their shape.

• they want to produce waste.

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The relationship between the size of a wound and how quickly it heals is:

• Larger wounds heal faster than smaller wounds.

• Smaller wounds heal faster than larger wounds.

• The size of a wound does not affect healing time.

• All wounds heal at the same rate regardless of size.

What is mitosis? How does it help a wound heal?

• Mitosis is a type of cell division that helps in growth and repair by producing identical cells, aiding in wound healing.

• Mitosis is a process of cell death that helps in removing damaged cells from a wound.

• Mitosis is a type of cell division that occurs only in plants and does not aid in wound healing.

• Mitosis is a process that occurs in bacteria to help them reproduce.

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How does mitosis help your body fight infection?

• By producing more white blood cells

• By producing antibodies

• By increasing body temperature

• By producing antigens

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What do scientists agree is the main reason that aging happens?

• Genetic factors

• Environmental influences

• Cellular damage

• Nutritional deficiencies

What happens to the ends of chromosomes after they are copied a lot of times during mitosis?

• They become longer

• They become shorter

• They remain the same length

• They disappear

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What are telomeres? Where are they found? What do they contain?

• Telomeres are the end caps of chromosomes, found in the nucleus, and contain repetitive DNA sequences.

• Telomeres are proteins found in the cytoplasm and contain enzymes.

• Telomeres are lipids found in the cell membrane and contain fatty acids.

• Telomeres are carbohydrates found in the mitochondria and contain glucose.

What happens to a cell after its telomeres are too short?

• The cell dies because it cannot replicate or repair.

• The cell becomes cancerous.

• The cell divides indefinitely.

• The cell repairs its telomeres.

Homeostasis is the process by which the body maintains a stable internal environment. Which of the following chemicals help to maintain homeostasis?

• Adrenaline

• Insulin

• Hemoglobin

• Melatonin

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A feedback loop is a system where outputs are circled back as inputs. How does it work?

• By amplifying changes in the system

• By maintaining equilibrium in the system

• By disrupting the system

• By ignoring changes in the system

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