The neurotransmitter thought to be involved in learning and memory is x acetylcholine.
norepinephrine.
glutamate.
glycine
GABA

The trp operon in e.coli regulates genes that code for enzymes required for synthesis of the repressible operon. when tryptophan is not available amino acid tryptophan. the trp operon is a in the environment, the trp repressor protein activeinactiveregulated. therefore, rna polymerase can bind to the genes to begin transcription.

Identify any four organelles that should be present in the eukaryotic organism and describe the function of each organelle

All vaccination should(n’t) be mandatory! 1.at least 5 sentences explaining 2.why? 3.in the end summarize the sentence