Which of the following statements about fixed macrophages is FALSE?
A) They are found in certain tissues and organs.
B) They develop from neutrophils.
C) They are cells of the mononuclear phagocytic system.
D) They are mature monocytes.
E) They gather at sites of infection.
B
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A class of pathogen recognition receptors that function exclusively as signaling receptors are known as the ________ receptors.
Fill in the blank(s) with the appropriate word(s).
Which of the following are most closely
related to the choanoflagellates? a. animals b. fungi c. amoebozoans d. algae e. none of these
Which of the following adds new nucleotides to a growing DNA chain?
a. DNA polymerase b. DNA helicase c. RNA primer d. primase e. RNA polymera
New data about rRNA led to the three-domain system of classification.
Answer the following statement true (T) or false (F)