BTEC Applied Science Triple Unit 1
Biology Questions And Answers With
Verified Solutions 100% Correct!!!
What is a cell - ANSWER✔✔The basic unit of all living things
Eukaryotic cell - ANSWER✔✔An organism consisting of one or more cells that
contain a nucleus
Prokaryotic cells - ANSWER✔✔Cell that do not consist of a nucleus
What is gram staining - ANSWER✔✔Danish man hans gram studied micro
biology and bacterium. He discovered bacteria have 2 types and categorised them
into Gram positive and gram negative.
Gram positives - ANSWER✔✔Consist of one cell wall and one plasma membrane.
When stairs it turns purple.
Gram negative - ANSWER✔✔Consists of one cell wall and two plasma
membrane. When stained turns pink.
How to test for gram P and Gram N - ANSWER✔✔Stain with crystal violet,
iodine then wash with alcohol. Then use a counter stain. Heating the sample is also
good so the bacteria gets fixed in place.
, What is gram staying used for - ANSWER✔✔Gram staining is used to identify if
an infection is Gram positive or negative as gram negative is less susceptible to
antibiotics.
Sperm(spermatozoa) - ANSWER✔✔Make gamete
Job- fertilisation
Adaptation- Digestive enzymes to break down ovum wall.
Flagellum for movement.
Lots of mitochondria for ATP.
red blood cell(erythrocyte) - ANSWER✔✔Job- carries oxygen and nutrients
around the body.
Adaptations- no nucleus to maximise storage for the oxygen and nutrients.
egg cell (ovum) - ANSWER✔✔female gamete
Job- reproduction.
Adaptations- cells cytoplasm contain nutrients for the growth of an early embryo.
white blood cells (leukocytes) - ANSWER✔✔Job- response to infection and
bacteria
Adaptations- some proliferate and differentiate into memory cells
White blood cells (Neutrophis) - ANSWER✔✔Job- role in immune system.
Adaptations- multi-lobed nuclei to squeeze into small gaps
Breathing - ANSWER✔✔movement of air into and out of the lungs
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