Why do you have to tilt the cover slip at an angle before lowering it down onto the slide?
To get rid of air bubbles!
100
How does a virus reproduce?
It requires a host cell to reproduce - otherwise it can't.
200
Why do we calculate Standard Deviation?
To see how spread the data is - how far the values are spread above and below the mean.
200
What are differentiated cells?
Cells that have 'specialized' and have a particular function
200
Explain the importance of surface area to volume ratio as a factor limiting cell size
the rate of material / heat exchange /?diffusion is proportional to surface area;?
- as a cell grows the surface area to volume ratio decreases
as the volume of a cell grows, the rate of metabolism increases
- the materials/heat cannot be exchanged fast enough to meet the needs of the cell
200
How many nm are in 1 mm?
How many micrometers are in 1mm?
1,000,000 nm = 1mm
1000 microm = 1mm
200
How does a paramecium move?
They have 'cilia' which they can beat back and forth to allow them to move.
300
In a normally distributed data set, what % will lie within 1 standard deviation of the mean?
68 %
300
What is a zygote?
The cell which forms after a sperm fertilizes an egg
300
What are the three 'strands' of the cell theory?
1) All living organisms are composed of cells. They may be unicellular or multicellular.
2) The cell is the basic unit of life.
3) Cells arise from pre-existing cells.
300
How do you calculate the MAGNIFICATION of an object?
Measured length / scale bar label
300
How did Robert Hooke come up with the name 'cell' in 1665? (what was he looking at, and why did he call it a 'cell')
He was looking at a slice of 'cork' and decided they looked like the rooms that monks slept in (which were called cells).
400
If your calculated chi squared value is LARGER than your Xcrit, what do you do?
Reject the null hypothesis
400
What does totipotency mean?
The ability of a single cell to divide and produce all of the differentiated cells in an organism
400
Describe two exceptions to the cell theory
- skeletal muscle cells (more than one nuclei)
- extra cellular material eg tooth dentine and bone
- Giant algae (1 cell = 5-100mm)
- Fungi hyphae (multi nucleated with no dividing wall)
400
A student views a cell that is magnified 1000x the image is 10mm long. What is the actual size of the cell?
Describe one benefit and one disadvantage for both embryonic and somatic stem cell use
Embryonic advantage: are totipotent and therefore can become anything
disadvantage: how they are derived (ethical issues related to embryo destruction.
Adult advantages:
- less chances of 'rejection' (sourced from the individual themselves)
- method of gaining is less problematic
Disadvantages: are limited in the 'possibilities' in what they can form
500
A school district is interested in finding if there is any evidence to suggest that attending pre-school provides students with education advantages later in life.
Use the counts in the frequency table to determine if there is an association between attending pre-school and pre-algebra achievement.
Chi squared = 2.85
Chi critical =
We accept the null hypothesis, there is no significant evidence that there is an association between attending pre-school and pre-algebra achievement.
500
What is a somatic stem cell
These are 'adult stem cells': undifferentiated cells found throughout the body that divide to replenish dying cells and regenerate damaged tissues
500
Order the following from smallest to largest:
Bacteria, plant cell, cell membrane, virus, animal cell, virus organelles, molecules