additional biology aqa

questions and answers, from aqa additional science revision guide

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  • Created by: anya
  • Created on: 13-04-13 23:03
in which part of the cell is energy released during respiration?
mitochondria
1 of 36
why is it possible to see a bacterial colony but not a single bacterium?
one bacterieum is very small whereas colonies are large.
2 of 36
why do muscle cells need a lot of mitochondria?
mitochondria release energy which muscles need for movement
3 of 36
what determines the net movement of particles across a cell/
concentration of particles on either side of membrane
4 of 36
what does a glandular tissue produce?
enzymes or hormones
5 of 36
where is soluble food absorbed?
small intestine
6 of 36
where does energy for photosynthesis come from?
sunlinght
7 of 36
why do enzymes reactions slow down?
when temperature falls the enzymes work slower
8 of 36
what is meant by dependent variable?
the variable that is being measured
9 of 36
name 3 substances used for storage in plants/
starch, fats and oils
10 of 36
what factors must be controlled in a greenhouse to improve plant growth?
light intensity, temperature and carbon dioxide levels
11 of 36
why are there so few animals living in very cold regions such as the Arctic?
very few plants meaning less food
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what is a quadrat?
square frame that may be divided into a grid used to estimate the number of something in a particular area
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what are proteins made of?
long chains of amino acids
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what is meant by denatured?
when temperature is too high the enzyme changes shape and stops working
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which enzyme digests starch?
amylase/carbohydrase
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where is bile produced?
the liver
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which enzyme is used to converse glucose into fructose?
isomerase
18 of 36
how do enzymes get into rivers/
water from house appliances go through sewage and may eventually reach rivers
19 of 36
where does aerobic respiration take place?
mitochondria
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which sugar is needed by the muscles for aerobic respiration?
glucose
21 of 36
which tyoe of cell division produces two identical cells from the original cell?
mitosis
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what type of cells are produced by meiosis?
gametes/sex cells
23 of 36
where are stem cells found?
sometimes they are found in human emryos and in adult bone marrow
24 of 36
which scientist worked out how characteristics are inherited/
gregor mendel
25 of 36
what does a gene code for/
order of amino acids in a protein
26 of 36
which sex chromosomes are found in human males?
X and Y
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what is meant by the term phenotype/
description of physical characteristic
28 of 36
name a genetic disorder which is controlled by a dominant allele?
polydactyly
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what are the chances of a child having cystic fibrosis if one parent has the disorder and the other is hetrozygous?
50% as one parent has to pass on the allele, the other parent has a 50% chance of passing it on
30 of 36
what is embryo screening?
tests carried out on emryos to diagnose possible genetic disorders
31 of 36
name a hard part of an animal which will not decay easily?
bones/teeth/shells/claws
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why are some fossils destroyed over time?
geological activity which breaks them up or wears them down
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how can a new predator cause extinction of a species?
it eats all the animals
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how do populations become isolated?
islands break away from mainland/ new rivers form/ mountain ranges or crater separate them
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what is meant by genetic variation?
wide range of alleles that control the characteristics in a population
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Card 2

Front

why is it possible to see a bacterial colony but not a single bacterium?

Back

one bacterieum is very small whereas colonies are large.

Card 3

Front

why do muscle cells need a lot of mitochondria?

Back

Preview of the front of card 3

Card 4

Front

what determines the net movement of particles across a cell/

Back

Preview of the front of card 4

Card 5

Front

what does a glandular tissue produce?

Back

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