Biology 1.1 Kognity
Terms in this set (21)
Which property allows stem cells to be used for therapeutic purposes?
They retain the ability to differentiate into specialized cells.
What is the effect of a large surface area to volume ratio in a cell?
Heat loss occurs quicker.
What are stem cells?
Cells that retain their ability to divide and differentiate.
In a cell, what is the effect of a large surface area to volume ratio?
Faster heat loss from the cell.
What is an example of the therapeutic use of a stem cell?
Restoration of myocardial tissue.
How does the differentiation of cells in multicellular organisms take place?
They express some of their genes part of the time but not other genes.
Give a reason why stem cell research using embryos is considered unethical.
Because the use of embryonic cells involves the termination of early-stage embryos.
What characteristics must be found in a structure to indicate that it is alive?
What describes tissues?
Groups of cells that develop the same way with the same function.
What is proportional to the celläs surface area?
Rate of exchange of materials.
A plant leaf drawn by a student was found to measure 6 cm in length from leaf apex to petiole. The magnification stated was ×5.5. Calculate the actual length of the leaf in centimetres. Please give your answer to 3 significant figures.
What are aseptate fungal hyphae?
Aseptate fungal hyphae are long threads (hyphae) with many nuclei, but no dividing cell walls.
Muscle cells do not fit the cell theory because:
They are multinucleated and are much larger than typical cells.
Why does Acetabularia challenge ideas about cells?
It is a large and complex cell.
A student observes and draws a protozoa by using the high power lens of a light microscope. The diameter of the drawing is 100 mm. The actual diameter of the protozoa is 250 µm. What is the magnification of the drawing?
Which functions of life are carried out by all unicellular organisms?
Nutrition, reproduction, response
As a cell increases in size, its small surface area to volume ratio limits the rate of exchange of materials with its surroundings. A cell can solve this problem by:
Developing projections from the cell membrane (microvilli) to increase its surface area.
Stem cells are suitable for therapeutic cloning because:
They are unspecialised cells that can give rise to a wide range of body cells by differentiating along different pathways.
What is Stargardt's disease?
Stargardt's disease is an inherited form of juvenile macular degeneration that causes progressive loss of vision, ultimately leading to total blindness.
Stargardt's disease can be treated by:
Injecting retinal cells derived from human embryonic stem cells into the retina of patients suffering from Stargardt's disease.
Which is not a source of stem cells?
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