All of the following are specialized epidermal cells EXCEPT
A. trichomes.
B. root hairs.
C. guard cells.
D. collenchyma.
Answer: D
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Tropheryma whipplei is characterized by the presence of periodic acid–Schiff (PAS)–staining macrophages, which indicates mucopolysaccharide or glycoprotein, in almost every organ system. Without treatment, this disease is uniformly fatal. Identification is achieved using:
a. enzyme-linked immunosorbent assay (ELISA). b. IFA. c. immunoblotting. d. real-time polymerase chain reaction (PCR).
The second round of meiosis in the testes produces ____
a. primary spermatocytes b. secondary spermatocytes c. polar bodies d. spermatogonia e. spermatids
A plant cell exhibits defects in transcription of transfer RNA genes. The gene encoding which polymerase is likely to be mutated in this cell?
What will be an ideal response?
An organism made up of many highly specialized kinds of cells that coordinate their activities is a(n)
A. simple multicellular organism. B. aggregation. C. colonial organism. D. complex multicellular organism.