7th Grade Science Unit One - Living Things and Cells

Check which of the items below are living things.
1. animals
2. rocks
3. bacteria
4. a virus
5. the gases in the atmosphere
In the scientific method, a ____________ is a possible explanation or answer to a question.
In a controlled experiment, how many variables are tested?
1. two
2. several
3. one
4. none
The measure of the amount of matter in an object is called its ______________.
All living things must have two parents in order to reproduce.
1. True
2. False
Check the items that are common to living things.
1. Living things all have cells.
2. Living thing never respond to external changes.
3. Living things reproduce.
4. Living things use energy.
5. Living things remain constant and do not grow.
Organisms that make their own food are called:
1. consumers
2. producers
3. decomposers
4. reproducers
Two ways of testing a hypothesis are:
(check the correct answers)
1. conducting controlled experiments.
2. analyzing
3. making observations.
4. drawing conclusions
5. reporting the results
Once the results of a scientific investigation have been reported, you can never change the hypothesis, even if new eveidence is discovered that suggest the original hypothesis should be changed.
1. True
2. False
To learn about an object, system or concept, we use models. Models that you can touch are called:
1. mathematical models
2. physical models
3. conceptual models
Basic needs of almost every organism include:
(check all that apply.)
1. Air
2. Food
3. Entertainment
4. Water
5. A place to live
6. Government
The elements contained in carbohydrates include:
(Check all that apply.)
1. oxygen
2. nitrogen
3. carbon
4. hydrogen
5. sulphur
____________ are large molecules made up of smaller modules called amino acids.
All living things have one or more cells.
1. True
2. False
Plants store extra sugar as ___________ .
Organisms use ___________ in the chemical process that releases energy from food.
Which of the following types of models are systems of ideas?
1. physical models
2. conceptual models
3. mathematical models
The ____________ is the smallest unit that can perform all life processes.
Some organisms may have only one cell.
1. True
2. False
Structures that perform specific functions within a cell are:
1. membranes
2. prokarytes
3. organelles
4. eukaryotes
The material that carries information needed to make new cells and new organisms is called:
There are two basic types of cells. Cell that have a _______ and cells with no _______ .
____________ are the world's smallest cells.
1. Eukaryotic cells
2. Bacteria
3. Organelles
4. Nuclei
No bacteria can survive in water where the temperature is above the boilng point at sea level.
1. True
2. False
The purpose of the cell's membrane is to prevent materials from moving into and out of the cell.
1. True
2. False
A ___________ is a group of cells that work together to perform a specific job.
1. organ
2. tissue
3. organ system
4. structure
Select the four levels of organization in living things:
1. organ systems
2. structure
3. cell
4. function
5. organ
6. tissue
All cells come from existing cells.
1. True
2. False
A collection of tissues that carry out a specialized function of the body is a (an) _____________.
If we compare an elephant's cells to a human's cells, we would find that they are:
1. larger
2. smaller
3. about the same size
_____________ is the diffusion of water through a semipermermable cell membrane.
Check what can be produced during two types of fermentation:
1. oxygen
2. lactic acid
3. water
4. carbon dioxide
5. glucose
The process that uses light energy, water and carbon dioxide to produce glucose and oxygen is __________.
Human body cells have ___________ chromosomes.
The cell cycle ends when the cell divides and forms new cells. The new cells must have an exact copy of the DNA of the parent cell.
1. True
2. False
3. True sometimes