6) A G-protein receptor with GTP bound to it A) is in its active state
B) signals a protein to maintain its shape and conformation
C) will use cGMP as a second messenger
D) directly affects gene expression
7) Testosterone functions inside a cell by
A) acting as a signal receptor that activates tyrosine kinases
B) binding with a receptor protein that enters the nucleus and activates specific genes
C) acting as a steroid signal receptor that activates ion channel proteins
D) coordinating a phosphorylation cascade that increases spermatogenesis

after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

hope its .

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products

c should be the answer

other information encoded in your genes might distinguish you from the others in the group