Cyanide is a poison that prevents mitochondria from using oxygen. As a result, the mitochondria cannot produce

A scientist is trying to discover a new treatment to stop cancer cells from dividing. In the cancer cells, which of these processes will stop if the treatment is successful?

Mammals, birds, modern reptiles, and theropod dinosaurs are vertebrates. The table below shows some of the differences and similarities among these groups of vertebrates.

Birds, mammals, and theropod dinosaurs can maintain a constant body temperature. The ability to maintain a constant body temperature is an example of

Streptococcus is a type of bacteria that causes strep throat in humans. A frog is a multicellular organism that lives in aquatic environments.

Which of these is the type of reproduction used by Streptococcus?

Streptococcus is a type of bacteria that causes strep throat in humans. A frog is a multicellular organism that lives in aquatic environments.

The diagram below shows a colony of prokaryotes and a single-celled eukaryote. The eukaryote contains organelles that resemble the three types of bacteria found in the colony of prokaryotes. More than a billion years ago, bacteria like these may have joined other prokaryotes to form colonies of cells. Researchers think that these once free-living prokaryotes became the organelles of modern-day eukaryotes.

In the eukaryote, which of these organelles are used to make sugars?

Scientists have recently discovered a new species that lives attached to the side of a tree. An organism from this new species

• is multicellular
   
• has cell walls
   
• has vascular tissues
   
• makes its own food
   
• has structures that absorb moisture from the air

Which of these is not true about cells in the new organism?

Which of these is an example of feedback in a biological system?

What is the primary role of the endocrine system?

Scientists have recently discovered a new species that lives attached to the side of a tree. An organism from this new species

• is multicellular
   
• has cell walls
   
• has vascular tissues
   
• makes its own food
   
• has structures that absorb moisture from the air

Which of these describes the function of the vascular tissues in this organism?

The ability of the human body to regulate the level of blood glucose is an example of

A protein called p53 can keep cells from dividing. To prevent cell division, this protein most likely stops

A group of students studied the effect of light intensity on the rate of a cell process in Elodea plants. The students exposed Elodea plants to different light intensities. A gas was produced by the cell process. The amount of this gas was measured. The rate of the cell process was determined by the amount of gas produced. A graph of the students' measurements is shown below.

Which of these parts of the Elodea plant cell produces the gas measured in the experiment?

A student observed different types of cells under a microscope. Four of the cells he observed are shown below.

Which of these structures in Cell 3 releases energy for use in cell processes?

A student observed different types of cells under a microscope. Four of the cells he observed are shown below.

Cell 4 has many hair-like structures that it uses for movement. What are these structures called?

Which of these organ systems is responsible for the removal of metabolic wastes from the blood?

Cholera bacteria live inside copepods, tiny marine organisms. This type of microscopic bacteria harms the copepods by feeding off their internal tissues.

Both of these organisms are found in oceans throughout the world. Unfavorable temperatures or salt levels may cause cholera bacteria to become inactive. When inactive, they do not feed or reproduce. When conditions become favorable, they become active once again.

A cholera population may depend on the population of copepods in the surrounding water. A simple food chain showing this relationship is shown below.

Cholera bacteria perform binary fission to

The diagram below shows the key steps for making proteins.

Which step involves ribosomes?

Mammals are exposed to a variety of outside temperatures. However, they are able to maintain a constant internal body temperature.

Describe ways that mammals warm and cool themselves in response to their environment.

Include in your response

• an example of a mammal and its environment
   
• both body structures and activities they use
   
• specific examples of both warming and cooling
   

All organisms must be able to exchange chemical substances between their cells and their environment. Some organisms are unicellular and others are multicellular. These organisms have different strategies to obtain and use these chemical substances.

• What chemical substances must be exchanged between each organism and its environment?
   
• Describe the processes that cause these chemical substances to move into and out of cells.
   
• Describe the role of the cell membrane in the exchange of materials in both types of organism.
   
• Describe the role of body systems in the exchange of materials in a multicellular organism.
   

Maryland white oak trees make their own food. Their cells contain structures that capture energy from the sun. What are these structures?