Pseudopods are structures that are primarily found in:

a. silicoflagellates.
b. amoeboid protozoans.
c. coccolithophores.
d. diatoms.
e. dinoflagellates.


B

Biology & Microbiology

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Which of the following statements are fundamental to the clonal-selection theory of how the adaptive immune system functions?

I) Each lymphocyte has a unique membrane receptor that recognizes one antigen. II) When the lymphocyte binds an antigen, it is activated and begins dividing to form many identical copies of itself. III) Cloned lymphocytes have slight differences and are selected by the spleen for removal if they do not bind an antigen. IV) Cloned cells descend from an activated lymphocyte and persist even after the pathogen is eliminated. A) only I and III B) only II and IV C) only I, II, and IV D) only II, III, and IV E) I, II, III, and IV

Biology & Microbiology

The DNA components adenine, thymine, guanine, and cytosine are examples of ____

a. phosphates b. sugars c. bases d. genes e. ribosomes

Biology & Microbiology

After infection occurs, the first line of defense for a host against a parasite is the ________ response

Fill in the blank(s) with correct word

Biology & Microbiology

__________ are multicelled heterotrophs without cell walls.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology