The excretory structures of annelids are referred to as

A. flame cells.
B. kidneys.
C. protonephridia.
D. metanephridia.
E. malpighian tubules.


D. metanephridia.

Biology & Microbiology

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The monomer subunit of immunoglobulin molecules has all of the following except

A. a variable and constant region on each polypeptide chain. B. disulfide bonds between polypeptide chains. C. four antigen binding sites. D. two identical heavy polypeptide chains. E. two identical light polypeptide chains.

Biology & Microbiology

What is a mutation?

What will be an ideal response?

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Haemophilus influenzae is a common cause of which of the following?

A. influenza B. dysentery C. upper respiratory tract infection D. hemophilia

Biology & Microbiology

Protons+neutron is

a. atoms b. atomic mass c. atomic number

Biology & Microbiology