Which statement(s) is (are) true with respect to the giant vent worms (Riftiapachyptila)?
A) These worms have a complete digestive tract.
B) Nutrients are derived from atrophosome filled with chemolithotrophic bacteria.
C) The worm's hemoglobin transports hydrogen sulfide and oxygen to its symbiont.
D) B and C
Answer: D
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Mutations usually disrupt collagen's function because
A) collagen is used as a cosmetic. B) collagen has a very precise structure. C) collagen has a variable structure. D) there are many types of collagen and this protein is widespread in the body.
The specific site upon which a hormone exerts its effect is referred to as a(n) ____________________ cell
Fill in the blank(s) with correct word
The ________ of each spinal nerve innervates the skin and muscles of the back
A) white ramus communicans B) gray ramus communicans C) posterior ramus D) anterior ramus E) dermatome
The changes an organism undergoes through time is called
A. organization. B. metabolism. C. reproduction. D. growth. E. development.