1. Bell work
7th Grade

2. #91 7th grade What is the function of a cell membrane?
control what enters and leaves the cell
Which organelle is the control center of a cell?
nucleus
Which organelles produce most of the energy needed by a cell?
mitochondria
What are the phases of mitosis?
prophase, metaphase, anaphase, telephase
What organelles use energy from sunlight to produce food?
chlorophyll

3. #92 7th grade What is the function of a cell membrane?
Which organelle is the control center of a cell?
Which organelles produce most of the energy needed by a cell?
How does a bacterial cell differ from a plant or animal cell?
What organelles use energy from sunlight to produce food?
To control what enters and leaves the cell
nucleus
mitochondria
It does not have a nucleus
chlorophyll

4. #93 7th grade
An organic compound always contains the element ________________.
How many oxygen atoms are in Al(NO3)2?
What is the smallest particle of an element?
Which molecule does C6H12O6 represent?
All metals except mercury are ____________.
Carbon
6 oxygen atoms
atom
sugar
Solid at room temperature

5. #94 7th grade How many sodium atoms are in Na2NO3?
Which organelle directs all activities?
What is the function of the nuclear membrane?
Which part of the atom is not in the nucleus?
The law of conservation of mass says… 2
nucleus
Protect nucleus
electrons
Mass of reactants = mass of the products

6. #95 7th grade
Leaves give off water vapor during the process of __________.
What provides shape and support for the cell and is mostly made of cellulose?
Whenever mechanical energy is converted into another form, some energy is transformed into _____.
What is the diffusion of water across a membrane?
Which element does S represent?_________.
transpiration
Cell wall
heat
osmosis
Sulfur

7. #96 7th grade Which symbol represents sodium? Na
Which part of the atom holds protons and neutrons?
nucleus
What organelle makes proteins in the cell?
- ribosome
What is respiration?
- oxygen breaking down food
What is the trachea?
- the windpipe

8. #97 7th grade 1. What is mitosis?
cellular reproduction (daughter cells are identical to original cell)
What is photosynthesis?
plant uses the energy from sunlight, CO2, and water to make food
3. What is it called when “food” is broken into CO2, water, and energy?
respiration
4. What is a pathogen?
(tiny organisms that cause infectious diseases)
5. Name four sources of pathogens.
(another person, contaminated object, animal bite, environment)

9. #98 7th grade 1. What is the metric unit of volume?
milliliter
2. The prefix kilo- means ?
1000
3. What is one decameter?
10 meters
4. What kind of mixture does blood represent?
Homogeneous
5. What are the steps to the scientific method?
observation, hypothesis, experiment, analyze data, conclusion, and report findings

10. #99 7th grade 1. What are the three basic shapes of bacteria?
round, rod shaped, spiral
2. What is the process of cell division called?
mitosis
3. What is the process called that rids the cell of waste products that would be toxic to the cell?
elimination
4. What are the self replicating genetic structures of the cell called?
chromosomes
5. What do the letters DNA stand for?
deoxyribonucleic acid

11. #100 7th grade What is the function of the mitochondria in the cell?
produce energy
2. Farmers and food companies use ___ to make milk into the many varieties of cheeses and yogurt.
bacteria
Tissues are found in living things. What is the definition of a tissue?
a group of cells with similar structure and function
4. Infer how air is changed between the time it is inhaled by a mammal and the time it is exhaled?
It contains less oxygen and more carbon dioxide
5. In the human body, the digestion of proteins takes place primarily between which two organs?
large intestine and small intestine