Explanation

The active site is a small region on the surface of an enzyme where the substrate binds, allowing the enzyme to catalyze the chemical reaction.

It is a highly specific region that is shaped to fit the substrate, allowing for efficient binding and catalysis.

Explanation

In plants, the cell wall is primarily composed of strong fibers of cellulose, a type of carbohydrate.

Cellulose is a polymer of glucose molecules that provides structural support, rigidity, and protection to the plant cell.

Explanation

Most protists are aquatic, meaning they live in water environments, such as oceans, rivers, lakes, and wetlands.

Many protists are single-celled and microscopic, while others are multicellular and macroscopic.

Explanation

A gene is a small segment of DNA that contains the information needed to encode a single protein.

It is the basic unit of heredity and is made up of a sequence of nucleotides (DNA building blocks) that are organized into codons, which specify the amino acids that make up a protein.

Explanation

Plants exchange gases through:

• Roots: absorb oxygen and release carbon dioxide through small openings called root hairs
• Stomata (singular: stoma): tiny openings on leaf surfaces that allow for gas exchange (CO2 in, O2 out)
• Stem: some plants have aerial roots or stem cuticles that allow for gas exchange

Explanation

Gaseous exchange refers to the exchange of gases between an organism and its environment.

Both photosynthesis and respiration involve gaseous exchange:

• Photosynthesis: takes in carbon dioxide (CO2) and releases oxygen (O2)
• Respiration: takes in oxygen (O2) and releases carbon dioxide (CO2)

Explanation

• The cortex is the layer of tissue between the epidermis (outermost layer) and endodermis (inner layer) in plant roots.
• It's a region of parenchymatous cells that stores food, water, and nutrients.

Explanation

All three processes allow movement in and out of cells:

• Osmosis: Movement of water molecules from high concentration to low concentration through a selectively permeable membrane.
• Diffusion: Random movement of molecules from high concentration to low concentration until equilibrium is reached.
• Active transport: Movement of molecules from low concentration to high concentration using energy (ATP) to pump molecules across the cell membrane.

Explanation

• Tables and graphs are both essential methods for organizing and visualizing data, and they complement each other.

Tables are useful for:

• Displaying precise values and data points
• Organizing large datasets
• Performing calculations and data analysis

Graphs are useful for:

• Visualizing trends and patterns
• Displaying relationships between variables
• Communicating complex data insights effectively

Explanation

It has an incubation period of between 7 and 17 days after exposure

And only becomes infectious once the fever develops.

A distinctive rash appears two to three days later.

The most infectious period is during the first week of illness

Although a person with smallpox is still infectious until the last scabs fall off.