STUDY Flashcards
(111 cards)
Steps of the scientific method
state the problem Form a hypothesis Test the hypothesis Analyze data Draw a conclusion
Controlled experiment
Allows the scientist to test a single variable
Eight characteristics of life
Made of cells Grow and develop Reproduce Maintain stable environment Genetic material evolve Use nutrients Respond to environment
homeostasis
Is the process by which organisms keep their internal conditions relatively stable
metabolism
Is the combinations of chemical reactions that occur in an organism
autotrophs
Produce our energy Example: plants, some bacteria, and protist
hererotrophs
Must eat other organisms to gain energy Example: fungi, animals, some protests and bacteria
prokaryotes
Lack a nucleus
eukarotes
Have a nucleus
cell
Smallest unit of life
Virus structure
DNA/DNA core surrounded by a protein coat
Bacteria structure
Cell wall with cell membrane, cytoplasm, no nucleus, and some have the ability to move
ATP
Is the energy molecule of the cell
Osmosis
Is the movement of water across a membrane from HIGH TO LOW concentration
Osmosis is regulated by
Isotonic (even), hypotonic (solution on the inside of the cell has a high concentration then the outside of the cell), and hypersonic (solution on the outside of the cell has a highr concentration than the inside of the cell) solution
When a cell is placed in salt water (hypertonic solution) what will happen
Water within the cell will leave and the cell will shrink
The movement of molecules is regulated by…
A selectively permeable cell membrane
Passive transport
Does NOT require energy to move molecules
Active transport
Requires energy to move molecules
diffusion
Movement of MOLECULES from areas of HIGH concentration to reads of LOW concentration until equilibrium is reached
osmosis
Movement of WATER from areas of HIGH concentration to LOW concentrations until equilibrium is reached
Facilitated diffusion
Molecules are mopped across a membrane by a caterer proton, from HIGH to LOW concentration
pinocytosis
Taking in large amounts of liquid
phagocytosis
Taking in large amounts of food