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

Biology & Microbiology

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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.

Biology & Microbiology

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

Biology & Microbiology

Myogenic is when what happens?

What will be an ideal response?

Biology & Microbiology

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

Biology & Microbiology