893103
Descripción
Test por Nicole Saville, actualizado hace más de 1 año
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Creado por Nicole Saville
hace más de 10 años
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Pregunta 1
Pregunta
What do mitochondria do?
Respuesta
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They're the site of respiration in the cell
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They're the site of protein synthesis in the cell
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They produce enzymes
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They're the site of photosynthesis in the cell
Pregunta 2
Pregunta
The liver has few mitochondria
Respuesta
- True
- False
Pregunta 3
Pregunta
Where in the cell are the ribosomes found?
Respuesta
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In the cytoplasm
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In the nucleus
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In all parts of the cell
Pregunta 4
Pregunta
What is a gene and what does it do?
Respuesta
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A section of a chromosome made of DNA
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A trouser made of denim
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The characteristics expressed by an individual
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It codes for a particular protein
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It allows protein synthesis to occur outside of the nucleus
Pregunta 5
Pregunta
What are the complementary base pairings?
Respuesta
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A-T, C-G
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A-G, C-T
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G -T, A-C
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A-A, C-C, T-T, G-G
Pregunta 6
Pregunta
How does protein synthesis occur outside of the nucleus when DNA can't leave the nucleus?
Respuesta
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mRNA carriers a copy of the DNA to the ribosomes
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The gene splits from the DNA and goes to the ribosomes
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The ribosomes come into the nucleus
Pregunta 7
Pregunta
What does meiosis produce?
Respuesta
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2 haploid cells
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4 haploid cells
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2 diploid cells
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4 diploid cells
Pregunta 8
Pregunta
The cells produced from mitosis are genetically identical
Respuesta
- True
- False
Pregunta 9
Pregunta
What is mitosis used for?
Respuesta
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Growth
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To make gametes
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Repair
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Sexual reproduction
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Asexual reproduction
Pregunta 10
Pregunta
How does DNA replicate?
Respuesta
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1. A double helix unzips to form two single strands of DNA
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1. It pairs up with another strand of DNA
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1. Half of the bases are removed from the DNA
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2. New complementary base pairs join up with the existing ones
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2. The two strands wind back together but in a different order
Pregunta 11
Respuesta
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Meiosis
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Mitosis
Pregunta 12
Pregunta
What are the advantages of being multicellular?
Respuesta
-
you can grow larger
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it allows cell differentiation
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organisms can become more complex
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you have spares in case some cells die
Pregunta 13
Pregunta
When an organism becomes multicellular it must have...
Respuesta
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communication systems between cells
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a system to supply cells with nutrients
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a system to control exchanges between cells
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a larger surface area
Pregunta 14
Pregunta
What is metabolic rate?
Respuesta
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The sum of all of the reactions occurring in the body
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How quickly you can digest food
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The rate at which you respire
Pregunta 15
Pregunta
Why do changes in temperature and pH affect respiration?
Respuesta
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Because respiration is controlled by enzymes
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Because muscles are slower when they're hot
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The oxygen content in the air changes in different pHs
Pregunta 16
Pregunta
What are the ethical issues with cloning animals?
Respuesta
-
people think it's wrong to interfere with nature
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cloning animals will cause mutants that revolt against humans, e.g. the wererabbit
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Cloning people will make someone that is not a real individual and that is wrong
Pregunta 17
Pregunta
Cloning plants is easier because plant cells retain the ability to differentiate
Respuesta
- True
- False
Pregunta 18
Pregunta
The first stage of genetic engineering is to insert a gene into another organism
Respuesta
- True
- False
Pregunta 19
Pregunta
What are the ethical issues of genetically engineering?
Respuesta
-
People are worried about the health risks of genetically engineered food
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People are worried that genetically engineered food wont taste nice
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People are worried that genetically modified plants/animals will disrupt the natural ecosystems
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Some people think it's morally wrong to create new life forms or move genes between species
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Some people are worried that the animal will lose connections with its friends if it is genetically modified and its friends aren't
Pregunta 20
Pregunta
Nuclear transfer can be used to clone animals
Respuesta
- True
- False
Pregunta 21
Pregunta
What are the uses of cloning animals?
Respuesta
-
Mass producing animals with desired characteristics, e.g. cows that produce a lot of milk
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Producing lots of animals that have been genetically modified to provide human products
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producing human embryos to provide stem cells for research and therapy
Pregunta 22
Pregunta
The right ventricle has a thicker layer of muscle around it than the left ventricle
Respuesta
- True
- False
Pregunta 23
Pregunta
What does the Aorta do?
Respuesta
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Transport oxygenated blood around the body from the heart
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Transport blood from the heart to the lungs
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Transport de-oxygenated blood from the body to the heart
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Transport de-oxygenated blood from the heart to the body
Pregunta 24
Pregunta
The tricuspid valve is on the right side of the heart
Respuesta
- True
- False
Pregunta 25
Pregunta
Why are there valves in the heart?
Respuesta
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To prevent backflow
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To prevent forward flow
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There are no valves in the heart
Pregunta 26
Pregunta
What are the advantages of a double circulatory system?
Respuesta
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It allows blood to be pumped at a higher pressure
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Blood can be pumped faster
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The blood doesn't have to travel as far
Pregunta 27
Pregunta
What are the differences between plant growth and animal growth?
Respuesta
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Plant cells retain the ability to differentiate
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Plants can keep growing forever
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Animals can keep growing forever
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Plant cells mainly grow by enlarging whereas humans grow by cell division
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