Answer:
D.
Explanation: Ecology: relation of organisms with one another or their surroundings.
Out of the following given choices;
A) excitatory, but not inhibitory, synapses
B) inhibitory, but not excitatory, synapses
C) electrical synapses
D) ligand-gated ion channels
The answer is D. These are transmembrane ion-channel proteins that open to allow ions such as Na, K, Ca, and/or Cl to pass through the membrane in response to the binding of a chemical messenger (i.e. a ligand), such as a neurotransmitter.
Answer:
ATP
Explanation:
ATP is a product of the first stage of photosynthesis.
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Answer:
The CRA-cAMP complex increases the rate of expression of lac operon when glucose is absent and lactose is present as nutrient.
Explanation:
CRP is the catabolite gene activator protein that forms a complex with cAMP. The CRP-cAMP complex facilitates the binding of RNA polymerase to the promoter region of the lac operon. This robust binding as stimulated by CRP-cAMP complex is followed by the formation of open complex and initiation of gene expression.
Hence, the CRP-cAMP complex positively regulates the lac operon and increases its expression when glucose is not present.
