The partitions that separate the segments of the annelid body are known as
A. pseudocoels.
B. nephridia.
C. setae.
D. septa.
E. radula.
D. septa.
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When a "new" antigen first challenges the immune system, if the primary immune response produces B cells, what are the fates of those B cells?
I-Some of the B cells become plasma cells that secrete antibodies. II-Some of the B cells become memory cells and can produce a swifter response if the body encounters that particular antigen again. III-Some of the B cells secrete chemicals called pyrogens that travel to the brain inducing a fever. A. just II B. just I C. II and III D. I and II E. I, II, and III
All of the microbes in the human body are collectively called the:
A) viruses B) human genome C) microbiome D) biofilm E) none of the above
Which of the following cells is living but their nuclei are lost during maturation?
A. guard cells B. companion cells C. meristem cells D. collenchyma E. sieve cells
The system of fungal filaments that penetrates and grows through the substrate is called a(n)
A. hyphal compartment. B. mycelium. C. mushroom. D. exoskeleton. E. sporangium.