What is the function of the choroid plexuses?

A) They form a bridge between the cerebral hemispheres.
B) They are responsible for visual reflexes.
C) They are small nerve plexuses in the brain.
D) They produce cerebrospinal fluid.
E) They are responsible for auditory reflexes.

The presence of a mRNA transcript of a gene in a cell means that

A) translation of the gene has occurred.
B) transcription of the gene has occurred.
C) a and b
D) none of the above