GS T2

B

1. Which statement BEST describes why water is essential to cells?

   • A. It supplies the energy needed to support cellular activities.

   • B. It provides a medium for many chemical reactions in cells.

   • C. It serves as the main source of ATP during cellular respiration.

   • D. It serves as a substitute for nutrients when food is unavailable.

C

2. A student says, "Proteins are important to cells mainly because they provide energy." Which response is MOST accurate?

• A. Correct, because proteins are the cell's preferred energy source.

• B. Correct, because all nutrients primarily function as energy sources.

• C. Incorrect, because amino acids from proteins are important building blocks for cellular proteins.

• D. Incorrect, because proteins cannot be used by cells under any circumstance.

B

3. Which situation BEST demonstrates that a nutrient can have more than one cellular role?

• A. Water can supply both energy and essential amino acids to cells.

• B. Lipids can store energy and form important parts of cell membranes.

• C. Minerals can produce both glucose and ATP for cellular activities.

• D. Vitamins can replace other nutrients when food intake becomes low.

C

4. A cell has sufficient glucose but cannot obtain enough water. Which cellular function would MOST likely be affected?

• A. The process of protein production within the cell

• B. The process of genetic information storage within the cell

• C. Various chemical reactions that require a suitable water-based environment

• D. The process of carbohydrate breakdown for energy release

B

5. Which statement BEST distinguishes glucose from ATP?

• A. Glucose is an inorganic substance, while ATP is an organic nutrient.

• B. Glucose stores chemical energy, while ATP supplies usable energy for cellular work.

• C. Glucose builds cellular proteins, while ATP supports digestive processes.

• D. Glucose and ATP are identical substances obtained directly from food.

B

6. A person eats a meal containing carbohydrates, proteins, and fats. Which statement BEST describes what ultimately becomes available to cells?

• A. Intact food particles directly enter cells and become cellular structures.

• B. Food is processed into smaller molecules and substances that can become available for cellular use.

• C. Only carbohydrates enter the cells because proteins and fats cannot be used by cells.

• D. All food is immediately converted into ATP before reaching the cells.

C

7. A muscle cell is performing intense physical activity. Why might its demand for oxygen increase?

• A. Oxygen supplies the materials needed to build muscle proteins.

• B. Oxygen provides calories that directly power muscle movements.

• C. Oxygen supports aerobic respiration, allowing cells to release usable energy from nutrients.

• D. Oxygen replaces glucose as the primary fuel during muscle activity.

B

8. A person consumes enough calories but has a diet severely lacking in several vitamins and minerals. Which conclusion is MOST scientifically accurate?

• A. The cells will necessarily function normally because calories are all cells require.

• B. Cells may malfunction because micronutrients support essential biochemical processes.

• C. Vitamins and minerals are unnecessary as long as glucose is available.

• D. Vitamins and minerals can always be synthesized by animal cells from glucose.

A

9. Consider the following situation: A cell has water, glucose, oxygen, and minerals, but its amino acid supply is severely limited. Which cellular function would MOST directly be affected?

• A. The synthesis of proteins needed for cellular structure and essential functions.

• B. The ability of water to act as a medium for cellular reactions.

• C. The ability of oxygen to participate in aerobic processes.

• D. The ability of glucose to store chemical energy.

D

10. Which statement BEST explains why cells require a variety of nutrients and materials rather than simply one source of energy?

A. All cellular materials perform the same function, but cells require them in different amounts.
B. Cells can survive normally as long as glucose is available because other nutrients can be produced from glucose whenever needed.
C. Cells primarily need nutrients to increase their size; energy production is a secondary process that occurs only during exercise.
D. Cells need diverse materials for energy, growth, regulation, and essential biochemical processes.

False, it is not static, but dynamic.

Cell is a static structure. True or False?

Cell, matter, energy

It is a dynamic living system that continuously exchanges — and — with its surroundings.

True

Even when a cell appears inactive, numerous processes are continuously occurring inside it. True of False?

• maintain their cell membrane

• maintain internal conditions

• synthesize molecules

• repair damaged structures

• transport substances

• communicate with other cells

• grow

• divide

• remove or process waste materials

Cells need materials and energy to:

True

A cell survives only when it can continuously obtain the materials and energy required to maintain its organization and perform its functions. True or False?

temperature
nerve signals
concentration gradients
cellular
molecules
tissues

• A student sitting quietly in class is still using energy.

• Cells are continuously:

  • maintaining the body's —

  • transmitting —

  • maintaining —

  • repairing — components

  • synthesizing —

  • maintaining —.

• Life does not stop simply because the organism is not physically moving.

Cellular Nutrients

metabolism
growth
repair
maintenance
synthesis
regulation

Substances that cells obtain and use to support (6)

To produce energy
To build new structures
To repair damaged parts
To grow and divide
To maintain normal cell functions

What do cells use nutrients for?

To produce energy, glucose, ATP

Cells use — and other nutrients to produce —, the energy source that powers cellular activities.

To build new structures

amino acids
fatty acids

proteins
membranes
cellular components

Cells use (2) and other materials to make (3).

To repair damaged parts, nutrients

Cells use — to replace damaged molecules and maintain their structures.

To grow and divide, energy, raw materials

Cells need — and — to grow and produce new cells.

To maintain normal cell functions, energy, nutrients, substances, internal, molecules

Cells use — and — to transport —, maintain — conditions, and produce important —.

True

Nutrients do not all have the same function. True or False?

Carbon and other raw materials

What do some cellular nutrients provide?

Energy-releasing processes

What do some cellular nutrients participate in?

Enzymes and biochemical reactions

What are some cellular nutrients needed for?

Fluid balance
Electrical conditions

What do some cellular nutrients maintain?

Cellular structures

What do some cellular nutrients become part of?

True

A nutrient does not automatically mean "energy." True or False?

Glucose
Amino acids
Minerals
Water

Nutrient examples

carbon
chemical energy

Glucose can provide? (2)

Amino acids, energy-related pathways

These are primarily important as building blocks for proteins, although they can also enter?

Minerals

It does not provide calories, but they are essential for numerous cellular functions.

Water

It does not provide calories, but life cannot continue without it.

Water

It is considered as “cellular environment.”

Water

It makes up a substantial portion of most living cells.

Water

Many substances must be dissolved in this before they can move through cellular environments.

aqueous environments

Many biochemical reactions occur in these environments.

Water

It helps maintain appropriate cellular conditions.

Water

It participates directly in some biochemical reactions.

True

A cell cannot simply perform its reactions in a completely dry environment. True or False?

move
dissolve
reactions
transported

Many cellular molecules interact in a water-based environment where:

• Molecules can —

• substances can —

• — can occur

• materials can be —

A person that is dehydrated

• Reduced water availability

• Changes in cellular and body fluid conditions

• Difficulty maintaining normal physiological processes

• Fatigue, weakness, reduced concentration, and decreased physical performance

Water is not simply a drink that prevents thirst; it is part of the environment in which cellular life occurs.

Read this carefully

Carbon-Based Nutrients

The materials cells build with.

Carbon-based molecules

Living cells contain many of these molecules.

carbohydrates
lipids
proteins
nucleic acids

Examples of Carbon-based molecules

Carbon-based molecules, carbon

These molecules are important because — can form stable bonds with many other elements, allowing cells to construct complex molecules.

Food Carbohydrates
Dietary Proteins
Dietary Lipids

Food that Provide Molecules That Can Become Cellular Materials

smaller carbohydrates/simple sugars —> molecules available to cells

Food Carbohydrates

amino acids —> amino acids available for protein synthesis

Dietary Proteins

fatty acids and other components —> materials for membranes, energy storage, and other functions

Dietary Lipids

• Food must be processed into forms that cells can use.

• A cell does not simply take an hour intact piece of rice, chicken, or bread and incorporate it directly into its structures.

Read this carefully.

Glucose

A simple carbohydrate that can serve as an important energy-rich molecule and metabolic starting material for cells.

Carbohydrates

In food, it can be broken down into simpler sugars.

Glucose

It can enter cellular metabolic pathways.

Glucose

Its chemical energy can eventually be transferred into usable cellular energy.

Carbon, glucose

— from — can also contribute to the formation of other cellular molecules.

False

Glucose is the same thing as ATP. True or False?

Glucose

contains stored chemical energy

ATP

provides readily usable energy for many cellular activities

• After eating a carbohydrate-rich meal:

  • Carbohydrate-rich meal (rice / bread / fruit) —> Digestion —> Smaller carbohydrate molecules —> Glucose becomes available —> Cells can process glucose

• The meal therefore does not immediately become "energy." It first becomes usable nutrients.

Read this carefully.

Proteins and Amino Acids

It is considered as “Building and Repairing Cells”

Amino Acid

Small organic molecules that serve as protein building blocks.

Dietary proteins

These are broken down during digestion.

Amino acids

It became available for cellular use.

amino acids

Cells can combine this to synthesize proteins.

Enzymes
Transport Proteins
Receptor
Structural Proteins

Cellular Proteins Include:

Enzymes

facilitate biochemical reactions

Transport Proteins

move substances

Receptor

receive signals

Structural Proteins

provide cellular support

amino acids

Without adequate amount of this, cells have difficulty producing and maintaining the proteins required for normal function.

True

Muscle development is not simply a matter of "getting energy." True or False?

Muscle cells also require materials to:

• synthesize proteins

• repair cellular structures

• maintain muscle tissue

Energy and building materials are different cellular needs.

Lipids

Energy-Rich Molecules and Structural Components

Lipids

energy storage
membrane structure
cellular signaling

A diverse group of organic molecules, including fats and molecules important for (3)

Lipids

Some contain large amounts of stored chemical energy.

Lipids

Cells can access this stored energy when needed.

Vitamins and Minerals

Small Amounts, Essential Functions

Vitamins

Organic compounds are required in relatively small amounts for normal biological functions.

Minerals

structural functions
regulatory functions
biochemical functions

Inorganic elements are required for various functions. (3)

Minerals

They generally do not serve as the main source of cellular energy. However, they are essential because many cellular reactions depend on them.

Iron
Calcium
Potassium and Sodium
Magnesium

Examples of Minerals

Iron

important in molecules involved in oxygen transport and energy-related processes.

Calcium

involved in signaling and muscle contraction.

Potassium and Sodium

important for maintaining electrical gradients across cell membranes.

Magnesium

participates in numerous enzyme-related processes and interacts with ATP.

A substance does not need to provide calories to be essential for life.

A person's diet can provide enough calories while still lacking important micronutrients.

Therefore: "Eating enough" and "meeting cellular nutrient requirements" are not always the same thing.

Read this carefully.

Oxygen

A Requirement for Many Energy-Producing Cells

Oxygen, aerobic cellular respiration

A gas required by many organisms for —.

Oxygen

• It is not itself a source of energy.

• It does not function like glucose.

Glucose

energy-rich molecule

Oxygen

participates in aerobic energy extraction

ATP

immediately usable energy carrier for cellular work

True

Not All Cells Obtain or Use Materials in Exactly the Same Way, True or False?

Plants

Can produce organic molecules such as glucose through photosynthesis.

water and mineral nutrients

Plants require?

Carbon dioxide

Plants obtain this from the environment.

Light energy

Plants use this to drive photosynthesis.