Life Processes & Biochemistry - Homeostasis

Homeostasis is the process by which a living organism maintains:

• A constant internal environment

• A variable external environment

• An increasing body temperature

• A decreasing metabolic rate

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Failure to maintain homeostasis will result in _______.

• disease or dysfunction

• improved health

• increased energy levels

• enhanced immune response

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Which of the following is an example of a feedback mechanism maintaining body temperature?

• Release insulin

• Shiver

• Release glucagon

• Low blood sugar

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The maintenance of blood sugar levels by _______ from the pancreas is an example of a feedback mechanism.

• insulin

• adrenaline

• glucagon

• thyroxine

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The changes in openings in the leaves of plants by guard cells to regulate water loss and gas exchange is an example of _______.

• stomatal regulation

• photosynthesis

• transpiration

• respiration

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Which of the following factors influence the rate at which enzymes work?

• Temperature and pH

• Color and shape

• Weight and height

• Sound and light

What happens to enzymes if they are not at the optimum pH or temperature?

• They become more active

• They become denatured

• They change their substrate

• They replicate faster

What is the significance of shape specificity in enzymes, hormones, receptor molecules, and antibodies?

• It allows them to interact with a wide variety of molecules.

• It ensures they can only interact with specific target molecules.

• It makes them more stable in different environments.

• It increases their overall size and complexity.

The levels of organization for structure and function in the human body from least complex to most complex are

• systems, organs, tissues, cells

• cells, organs, tissues, systems

• tissues, systems, cells, organs

• cells, tissues, organs, systems

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Which statement best compares a multicellular organism to a single-celled organism?

• A multicellular organism has organ systems that interact to carry out life functions, while a single-celled organism carries out life functions without using organ systems.

• A single-celled organism carries out fewer life functions than each cell of a multicellular organism.

• A multicellular organism always obtains energy through a process that is different from that used by a single-celled organism.

• The cell of a single-celled organism is always much larger than an individual cell of a multicellular organism.

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