WCAS - Washington Comprehensive Assessment of Science Molecules to Organisms Structures Questions and Answers — Questions and Answers
Question 1: A student is examining a diagram showing the levels of biological organization. Which of the following lists correctly arranges these levels from the simplest to the most complex?
- Organelle, Cell, Tissue, Organ, Organ System (Correct answer)
- Cell, Organelle, Tissue, Organ System, Organ
- Tissue, Cell, Organ, Organelle, Organ System
- Organ System, Organ, Tissue, Cell, Organelle
Correct answer: Organelle, Cell, Tissue, Organ, Organ System
The hierarchy of biological organization builds from smaller components to larger, more complex structures. Organelles are functional units within a cell. Similar cells group together to form tissues. Different tissues work together as an organ. Multiple organs cooperate within an organ system.
Question 2: A student observes a cell under a microscope and notes the presence of a rigid cell wall, a large central vacuole, and numerous chloroplasts. Based on these observations, the student can most likely conclude that the cell is from what type of organism?
- A fungus
- An animal
- A plant (Correct answer)
- A bacterium
Correct answer: A plant
Plant cells have several distinct structures not found in animal cells, including a rigid cell wall for support, a large central vacuole to maintain turgor pressure, and chloroplasts for photosynthesis. Animal cells lack these features, and while bacteria have cell walls, they do not have membrane-bound organelles like chloroplasts or a large central vacuole.
Question 3: The heart is an organ composed of cardiac muscle tissue, connective tissue, and nervous tissue, all of which work together to pump blood. This is an example of which biological principle?
- Cells differentiating to perform unique roles.
- Organs grouping together to form an organ system.
- Similar cells aggregating to form a single tissue.
- Multiple tissues combining to form a functional organ. (Correct answer)
Correct answer: Multiple tissues combining to form a functional organ.
An organ is defined as a structure made up of two or more different types of tissues that work together to perform a specific function. In this case, the muscle, connective, and nervous tissues combine their functions to create the organ known as the heart.
Question 4: In a complex multicellular organism, which organ system is primarily responsible for detecting stimuli from the environment and coordinating the body's responses?
- Endocrine system
- Nervous system (Correct answer)
- Circulatory system
- Muscular system
Correct answer: Nervous system
The nervous system, which includes the brain, spinal cord, and nerves, is specialized to detect changes (stimuli), process information, and send signals to muscles and glands (effectors) to produce a coordinated response.
Question 5: Mitochondria are often called the 'powerhouses' of the cell. What is the primary function of mitochondria in both plant and animal cells?
- To store genetic information and control cell activities.
- To capture light energy and convert it into chemical energy.
- To break down sugars to release energy in the form of ATP. (Correct answer)
- To package and transport proteins and lipids.
Correct answer: To break down sugars to release energy in the form of ATP.
The primary function of mitochondria is to perform cellular respiration. During this process, they break down glucose (sugar) and other fuel molecules to produce ATP (adenosine triphosphate), which is the main energy currency used to power cellular activities in both plants and animals.
Question 6: Which of the following statements BEST describes the relationship between cells and tissues?
- Tissues are made of a single, highly specialized cell.
- A cell is made up of several different types of tissues.
- Tissues are groups of similar cells that work together to perform a specific function. (Correct answer)
- Cells and tissues are independent structures with unrelated functions.
Correct answer: Tissues are groups of similar cells that work together to perform a specific function.
In the hierarchy of biological organization, the level above the cell is the tissue. A tissue is defined as a group of similar cells that are organized to carry out a specific, shared function. For example, muscle tissue is composed of many muscle cells that contract together.
WCAS - Washington Comprehensive Assessment of Science Molecules to Organisms Structures Questions and Answers
A student is examining a diagram showing the levels of biological organization.
Which of the following lists correctly arranges these levels from the simplest to the most complex?