Areading frame is the order in which are read.
a. nucleotides
b. polypeptides
c. chromosomes
d. codons

Neurotransmitters are messengers responsible for communication between neurons. they are released from synaptic vesicles and are received by receptors.  the communication is referred to as neurotransmission. the following statement is true about neurotransmitters: a. they're stored in synaptic vesicles in the axon.

Centriole.centrioles are present in animal cells but are usually absent in plant cells.