6. How is lactic acid removed during recovery from exercise?
heart continues to beat faster than normal so his blood can carry lactic acid away from his muscles to be broken down in the liver. This requires oxgen. The extra oxygen required to remove the lactic acidis called the oxygen debt.
slows breathing down so it can be transferred to the lungs where it can be broken down. this does not require oxygen and therefore a lot of oxgyen is not used which is called oxygen debt.
7. What is anaerobic respiration ?
respiration releases energy without the use of oxygen and produces lactic acid as waste
releases energy with the use of oxgyen and produces lactic acid
releases energy without use of oxygen but does not produce lactic acid
8. Name all the scientists involved in the discovery of DNA structure
Alexander Fleming and Rosalind Franklin
Rosalind Franklin
Watson, Crick, Rosalind Franklin, Maurice Wilkins, Erwin Chargaff
Watson and Crick
9. Definition for metabollic rate
amount of energy your body needs
amount of energy your body wastes
amount of energy your body does not use
10. What is an enzyme ?
chemical catalyst- each enzyme is specific to each substrate
biological catayst- each enzyme is specific to each substrate
biological catalyst- enzyme is the same for every substrate
11. Explain how temperature affects enzymes and the lock and key mechanism
As the temperature increases, the molecules gain more energy; more collisions occur and the rate of reaction increases. Above optimum temperature, the enzyme denatures and the reaction stops
it has no affect
at low temperatures the molecules lose energy; less collisions occur and the rate of reaction decreases meaning the reaction stops
12. What does genetic code control ?
cell activity and production of ribosomes
cell activity and production of different proteins
production of chromosomes and genes
production of mitochondria and cell activity
13. Explain the journey of mRNA
mRNA carries the ribosomes to the amino acids
mRNA leaves the nucleus and travles to the ribosomes
mRNA travels from the ribosomes to the nucleus
mRNA travels to the nucleus
14. True or False: anaerobic respiration releases much more energy per glucose molecule than aerobic respiration and give reason why
false because glucose is only partly broken down
true because glucose is only partly broken down
15. where does respiration occur ?
ribosomes
mitochondria
in DNA
nucleus
16. Where is the energy made during respiration stored?
PTA
ATP
AATP
TPA
ATTP
17. True or false: all genes are switched off in cells
false
true
18. What is translation ? (ribosomes)
At the ribosomes the mRNA code is used to put the amino acids together in the right order and form the protein
amino acids bind to grow a protein chain
DNA code is copied
amino acids are put in the right order by the mRNA
19. what are chromosomes made of and what do they contain?
