The answer would be A Rachel Carson
Answer:
Explanation:
A. Cancer cells are cancerous because they divide all the time. Normal cells stop dividing once there's enough of them but cancer cells divide when not required as well. Therefore, if Ras is mutated it will always be "on" which means it will activate the pathway which will lead to division of cells i.e. cells divide to multiply their numbers so more cells will be made. Normally, cells only multiply whne there's the growth factor present to activate the whole pathway, but since Ras is mutated it doesnt need the growth factor to activate the pathway, it automatically always activates the pathway even in absence of growth factor.
B. It is highly unlikely that the proposed drug will have a useful effect. This is because mutant Ras protein of this type behaves as though it is constantly "on". Ras acts downstream of the receptor, i.e. first you have the reception of growth factor in receptor, then the ras gets activated. However, the activating mutation makes its effect felt (Ras is activated no matter if there's a growth factor or not), which is why mutant Ras is always active and no longer dependent on the receptor for activation.
Therefore, blocking the ability of the receptor to dimerize and activate Ras will probably not have an effect on cells containing the mutant Ras protein as it does not inhibit the activity of mutated Ras protein.
(Check out the Ras/Ref/MEK/Erk pathway for better understanding of how significant role Ras protein plays in cell proliferation i.e. division)
Answer:
The given blanks can be filled with vesicle, release, and blocking the action of enzymes.
Explanation:
The psychoactive are the drugs, which instigates the discharge of excitatory neurotransmitter as glutamate, and the antipsychotics diminish the excitation of the neuron. The mentioned drugs could enhance the effect of a neurotransmitter by inducing the leak of neurotransmitter due to the dissociation of a synaptic vesicle, by preventing the release of the neurotransmitter from the presynaptic membrane, and by obstructing the activity of the enzymes that usually breaks down the neurotransmitter.
Answer:
A= uses a beam of light to produce magnified images
Explanation:
