Which of the following is a characteristic of most flatworms?
a. having an incomplete digestive system
b. fertilizing externally
c. having a respiratory system
d. digesting intracellularly
a. having an incomplete digestive system
You might also like to view...
Fossils
(a) are remains of organisms. (b) are formed when organic materials are replaced with minerals. (c) provide evidence of evolution. (d) are all of the above.
Arrange the steps of antibody-mediated immunity in the proper order
1) Plasma cells secrete antibodies. 2) Helper T cells interact with B cells displaying the same antigen-MHC complex. 3) Contact with antigen. 4) Clones of B cells produced. 5) Fragmentation of antigen.
a. 3, 2, 5, 1, 4 b. 3, 5, 2, 4, 1 c. 1, 3, 5, 2, 4 d. 4, 3, 2, 1, 5 e. 5, 3, 4, 2, 1
Myogenic is when what happens?
What will be an ideal response?
The bacteria which are capable of applying only the oxidative pathway to produce energy from glucose are classified as:
A. Facultative aerobes B. Facultative anaerobes C. Obligate aerobes D. Obligate anaerobes