Biology Flashcards
The basic unit of life is the organelle.
False
Only animal cells have cell walls.
False
The cytoplasm includes the organelles and other life-supporting materials.
True
Osmosis involves the diffusion of water through a permeable membrane.
False
When a substance cannot penetrate a membrane, it cannot diffuse from an area of higher concentration to an area of lower concentration.
True
Which organelle makes energy available to the cell?
Mitochondrion
What must substances pass through to enter or leave a cell?
Cell Mebrane
Which organelle breaks down food into particles that the cell can use for survival?
Mitochondrion
Which of the following structures serves as a boundary between the cell and the environment?
Cell Mebrane
Which cell structure contains the cell’s genetic materials and controls the cell’s activities?
Nucleus
The number of molecules of a substance in a given volume
Concentration
Diffusion
Movement of molecules from an area of high concentration to an area of low concentration until they are evenly distributed
Osmosis
The movement of water molecules across a membrane in response to concentration differences
Cell Membrane
Controls the flow of materials into and out of the cell
Chlorplast
Traps energy from the Sun to make glucose
During interphase, the elongated cell begins to pinch apart at the centre.
False
During anaphase, the new chromosomes are pulled apart and drawn to each end of the cell.
True
During metaphase, the chromosomes begin to uncoil.
False
The phases of mitosis occur in this order: prophase, anaphase, telophase, and metaphase.
False: Prophase, Metaphase, Anaphase, Telophase.
The chromosomes align themselves in the middle of the cell during:
Metaphase
The new chromosomes are pulled apart and drawn to each end of the cell during:
Anaphase
In which phase of the cell cycle do cells spend most of their time?
Interphase
During which stage of mitosis do the loosely arranged strands of chromosomes become coiled, shortened, and distinct?
Prophase
All specialized cells are the result of cell differentiation.
False
The following is the correct order of the hierarchy of organization for any organism:
tissue, cell, organ system, organism, organ
False: Cell, tissue, organ, organ system, organism.
The human heart contains muscle cells, nerve cells, connective tissue, and epithelial tissue.
True
A group of cells that performs similar functions is called an organ.
False
The nervous system, circulatory system, and respiratory system all work together when you exercise.
True
The four principal types of tissues are
Epithelial, connective, muscle, nervous.
Which type of tissue allows for the movement of the skeleton or organs?
Muscle
The major function of epithelial tissue is
To protect exposed surfaces
The major function(s) of connective tissues are
1) To support blood vessels and nerves.
2) To cushion organs.
3) To connect organs
The wall of the capillaries surrounding the alveolus is several layers thick.
False
Carbon dioxide-rich blood is received from the body in the right atrium.
True
Oxygen-poor blood moves into the left ventricle, which pumps it to the body cells.
False
Arteries are thick-walled, elastic blood vessels.
True
Which blood vessels are one cell thick?
Capillaries
Arteries carry oxygen-rich blood from the heart to the
Capillaries
The esophagus pushes the food into the stomach using wave-like muscular contractions called
Persitalis
How many hours does it take from ingestion of food to elimination?
36 hours
Involves sending electromagnetic radiation through the body
X-Ray
Directs sound waves at specific body parts
Ultrasound
Scan that involves small amounts of radioactive materials taken into the body
PET Scan
Produces a 3-D image of body parts
CT Scan
Involves passing radio waves through a magnetic field around the body
MRI Scan
