1.3-1.4 Quiz Flashcards
What are cells made up of?
Living matter and is surrounded by something protective(think of a cell wall)
What are cells?
The smallest unit of organisms that are alive
What are three main things cells do?
Grow, respond to their surroundings, and reproduce
What are two characteristics that cells have?
They are organized and highly complex
What two types of felled organisms?
Multicellular(many cells)
Unicellular(one cell)
What are the two types of reproduction processes?
Asexual-celled organism break in half and forms two organisms that are identical;portion of a organism breaks away to make another identical organism
Sexual-two cells from different parents unite to produce the first cell of a new organism
What are the characteristics that all living things have in common?
Made up of units called cells, can reproduce, based on universal genetic code, can grow and develop, can obtain and use materials for energy, they respond to their environment, maintain a stable internal environment, and change overtime
Why do organisms need energy?
They use energy to grow, develop, and reproduce
What is metabolism?
The combination of reactions through which an organism builds up or break down materials
What is biology?
The study of living things
Why do scientists need a common system of measurement?
Researchers need replicate each other’s experiments and most experiments involve measurements. They thought it would easier if used a common system of measurement that was simple
When collecting data and doing experiments, what system of measurement is used?
Metric system
What is the metric system?
System of measurement whose units are based on certain physical standards and scaled on multiples of ten. It’s also a decimal system
1000m=______
1km
1L=______
1000mL
1000kg=_______
10000g
When scientists are collecting data, what are they trying to find out?
Whether certain factors changed or remained the same
What does graph of data make easier to recognize than a table of data?
Patterns can easier to understand
What are microscopes?
Devices that produce magnified images of structures that are to be seen with the unaided eye
What are compound light microscopes?
Devices that allow light to pass through the specimen and use two lenses to form an image
How do chemicals stains make light microscopes more useful?
They can show the specific structures in a cell
What are the two main types of electron microscopes?
Transmission(TEM)
Scanning(SEM)
How must samples be prepared for observation for an electron microscope?
They must preserved and dehydrated before placed under an electron microscope
Compare TEMs and SEMs produce images.
TEM-shine a beam of electrons a thin specimen
SEM-scan a narrow beam of electrons back and forth across the surface of a specimen
A group of cells grown a nutrient solution from a single original cell is called a what?
Cell culture
What technique do biologists use to separate one cart of a cell from the other?
They use a technique known as cell fractionation to separate the different parts
What is the most important lab safety rule?
Allows follow the teacher’s and textbook instructions exactly
