Which of the following statements is TRUE for prokaryotes?
a) They generally lack organelles (such as nuclei).
b) Their DNA is associated with histone proteins.
c) Their cell walls are chemically simple.
d) They are multicellular organisms.
Ans: a) They generally lack organelles (such as nuclei).
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Mosses have stems, roots, and leaves
____________________ Indicate whether the statement is true or false.
Which of the following statements about the immune system is correct?
a. Memory cells are involved in a primary immune response. b. Dendritic cells were first identified in the nervous system. c. Interferons are specific proteins that block cell replication at the level of mitosis. d. Natural killer cells are involved in both specific and nonspecific immune responses. e. Defensins are one type of protective protein synthesized by T helper cells.
T cell receptors recognize ______, distinguishing cells that belong to the body from infected body cells.
A. antigens B. MHC markers C. antigens and MHC markers D. complement E. cytokines and complement
The fusion of the cytoplasm is known as:
A. Fertilization B. Karyogamy C. Plasmogamy D. Sporulation