Serotonin is derived from the amino acid tryptophan and is an important neurotransmitter.

a. True

b. False

What type of rock is made of particles. 05 cm?

Explain and briefly describe the geological time scale. How does it relate to the science of biology?

In addition to his characteristic what other factors influence the passage of substances through the living membrane

Oxygen dissociation curve is a. sigmoid b. parabolic c. hyperbolic d. straight line

Select all characteristics that apply to Archaea.

Why is anti-bacterial items and hand sanitizer bad for normal flora?

If Venus has an atmosphere, why doesn't it support the kind of life that is now found on earth?

What cell part stores material within the cell?

How do sieve tube member (stm) cells differ from tracheids? stm cells function as living cells; tracheids function as dead cells stm cells lack a companion cell; tracheids have a companion cell stm cells occur in angiosperms;

Which systems act on the same organs but in opposite ways? a. the central and peripheral nervous systems b. the sympathetic and parasympathetic nervous systems c. the somatic and enteric nervous systems