Download FORMATIVE Cell Test 1 Answers 2015

Formative Test – Stage 1 Biology
Cells and Life
Multiple Choice:
1. L
2. M
3. K
4. M
5. J
6. J
7. M
8. M
9. K
10. M
Short Answers
1.
The theory states that a cell only ever comes from previous existing cells. This
contradicts spontaneous generation as it says that cells can come from non-living
matter.
2a
You needed to choose one of the following: Lipids, carbohydrates, protein, nucleic
acids, and make some notes on it structure as a molecule
2b.
Without lipids: the cell would be missing a very important molecule for storing
energy; it would be missing key molecules that make up its cell membrane!
Without carbohydrates: the cell would be missing a very important molecule for
storing energy or for use in respiration to make usable ATP energy; it would be
missing important molecules that give structure to the cell well if it was a plant cell
Without proteins: the cell would be missing really important molecules in its
membrane that help control what comes in and out of the cell; the cell would not
have any enzymes and other key molecules that are used in chemical reactions and
in sending messages around the cell
Without nucleic acids: the cell would be missing the key set of instructions for how
the cell functions and works; the cell would be missing the ability to make proteins;
it would not be able to divide and pass on information to daughter cells; it would die.
3.
Reasons why viruses are not living things:



They do not use energy and produce waste like other living things
They are not made up of cells like other living things
They are not really able to perform homeostasis like other living thigns
4.
Homeostasis is the ability for an organism to maintain a constant internal
environment even when conditions in their external environment changes. An
example is the ability for penguins to maintain warm internal body temperatures in
the Antarctic, which can reach -50oC
1
5a.
Arrow showing osmosis should be pointing to the right
5b.
It would move to the left (from high [] to low [])
5c.
Hypertonic solution
5d.
This cell would start to shrink and become more flaccid
5e.
Add more salt to the outside solution – and so make the [] gradient steeper
6.
Label 4
7.
Organism 1 will be more efficient because, as you can see in the many cells that
make it up, it has a far greater surface area than the single celled organism. More
surface area compared to volume, means a better ability to diffuse water and
nutrients into the cell’s insides.
8a.
hypotonic
hypertonic
Before
After
Dividing membrane
8b.
Because water is moving by osmosis through the membrane to the side with the
higher solute [] in order to balance the [] out.
8c.
Yes. It is letting water through, but not the solute molecules.
2
9a.
Hypotonic
9b.
Large permanent vacuole, as it is swollen to be much larger than normal.
9c.
It has caused the cell to swell in size. It has also caused the cell’s internal turgor
pressure to increase.
10.
Varied answers.
11.
Photosynthesis:
6H2O + 6CO2
light
C6H12O6 + 6O2
Respiration:
C6H12O6 + 6O2
6H2O + 6CO2 + useful energy (38 ATP)
3
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