7th Grade Science Unit One - Living Things and Cells
Check which of the items below are living things.
In the scientific method, a ____________ is a possible explanation or answer to a question.
In a controlled experiment, how many variables are tested?
two
several
one
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.
True
False
Check the items that are common to living things.
Organisms that make their own food are called:
consumers
producers
decomposers
reproducers
Two ways of testing a hypothesis are: (check the correct answers)
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.
True
False
To learn about an object, system or concept, we use models. Models that you can touch are called:
mathematical models
physical models
conceptual models
Basic needs of almost every organism include: (check all that apply.)
The elements contained in carbohydrates include: (Check all that apply.)
____________ are large molecules made up of smaller modules called amino acids.
All living things have one or more cells.
True
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?
physical models
conceptual models
mathematical models
The ____________ is the smallest unit that can perform all life processes.
Some organisms may have only one cell.
True
False
Structures that perform specific functions within a cell are:
membranes
prokarytes
organelles
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.
Eukaryotic cells
Bacteria
Organelles
Nuclei
No bacteria can survive in water where the temperature is above the boilng point at sea level.
True
False
The purpose of the cell's membrane is to prevent materials from moving into and out of the cell.
True
False
A ___________ is a group of cells that work together to perform a specific job.
organ
tissue
organ system
structure
Select the four levels of organization in living things:
All cells come from existing cells.
True
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:
larger
smaller
about the same size
_____________ is the diffusion of water through a semipermermable cell membrane.
Check what can be produced during two types of fermentation:
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.