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Biology- As Level 2023 Exam Questions with Detailed, (COMPLETE ANSWERS), 2024; 100% TRUSTED Complete, trusted solutions and explanations $7.99   Add to cart
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Biology- As Level 2023 Exam Questions with Detailed, (COMPLETE ANSWERS), 2024; 100% TRUSTED Complete, trusted solutions and explanations
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Biology- As Level 2023 Exam Questions with Detailed, (COMPLETE ANSWERS), 2024; 100% TRUSTED Complete, trusted solutions and explanations

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  • November 17, 2024
  • 33
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • Biology

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Biology- As Level 2023
Study online at https://quizlet.com/_f3ax2w

1. What is the cell theo- all living things are made of cells, cells are the basic
ry? (3 parts) units of structure and function in living things, every
new cell comes from the division of a pre-existing cell

2. Define magnification The degree to which the size of an image is larger
than the object itself

3. Define resolution the ability to distinguish two objects as distinct from
one another

4. Why do we lower To prevent artefacts and air bubbles
cover slip slowly at
an angle using a nee-
dle?

5. When looking down Greater field of view (makes it easier to focus/centre
a microscope why on cells)
do we always use the
lowest magnification
first?

6. What is a dry mount No stain/ Liquid
in microscopy

7. What do you need Specimens must be thin
to consider when When preparing a wet mount the refractive index of
preparing slides the sample should be similar to the glass slide
A cover slip must be placed onto a wet mount at an
angle (to prevent air bubbles forming

8. What scale is millimetre, Micrometre (um), Nanometre (Nm)
used when convert-
ing measurements?

9. What is an eyepiece a glass disc that fits on top of the eyepiece lens that
graticule? is marked with a fine scale from 1 to 100

10. plant and animal Eukaryotic
cells are what type of
cell?


, Biology- As Level 2023
Study online at https://quizlet.com/_f3ax2w


11. Name organelles of a
animal cell




12. What extra or- 1. A cell wall with plasmodesmata (channels for ex-
ganelles, aside from changing substances)
the animal or- 2. A vacuole
ganelles, do plant 3. Chloroplasts
cells contain?




13. What is the function regulates the movement of substances in and out of
of the cell surface/ the cell.
plasma membrane

14. What is the function Control centre of the cell.
of the Nucleus DNA contains instructions to make proteins.
The pores allow for substances to move from the
nucleus to the cytoplasm.
The nucleolus makes ribosomes.




15. What is the function contains digestive enzymes that can be used to digest
of lysosome invading cells.

16. What is the function Site where proteins are made
of the ribosomes



, Biology- As Level 2023
Study online at https://quizlet.com/_f3ax2w




17. What is the func- The surface is covered with ribosomes. It folds and
tion of the rough en- processes proteins that have been made at the ribo-
doplasmic reticulum somes.
(RER)




18. What is the function Similar to RER but with no ribosomes. It synthesises
of the smooth en- and processes lipids.
doplasmic reticulum
(SER)

19. What is the function To store and transport molecules
of the vesicle

20. What is the function Processes and packages new lipids and proteins and
of the Golgi appara- makes lysosomes
tus

21. What is the function The site of aerobic respiration, where ATP is pro-
of the mitochondri- duced. They're found in large numbers in cells that are
on very active and require a lot of energy.




22. What is the function Involved with the separation of chromosomes during
of the centriole cell division



, Biology- As Level 2023
Study online at https://quizlet.com/_f3ax2w
23. What is the function to keep debris out of the tissue
of the cilia

24. What is the function movement
of the flagellum

25. What are the main 1. Microtubules and microfilaments support the cells
functions of the cy- organelles, keeping them in position.
toskeleton? 2.Strengthen the cell and maintains its strength.
3. Responsible for movement of materials within a
cell.

26. Compare eukaryotic
cells to prokaryotic
cells


27. What are the three (a) light microscope, (b) Laser scanning confocal mi-
types of micro- croscope, (c) electron microscope (scanning electron
scope? microscope and transmission electron microscope)

28. What is a light mi- max magnification is x1500 ,max resolution is 200nm
croscopes magnifi-
cation and resolu-
tion?

29. what does a laser -Uses laser beams to scan the specimen, which is
scanning confocal usually tagged with the fluorescent dye.
microscope do? -the laser causes the dye to fluoresce. This light is
then focused through a pinhole on to detector. The
detector is hooked up to computer, which generates
an image. The image can be 3-D.
-The pinhole means that any out of focus light is
blocked, so these microscopes produce a much clear-
er image and normal light microscope.
-they can be used to look at objects of different depths
in thick specimens

30. 1. Higher resolution
2. Can produce 3D images

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