If an oocyte is traveling through the oviduct, what stage must it be in?
a. meiosis I
b. meiosis II
c. primary oocyte
d. follicular phase
e. polar body
b
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Temporal gene regulation refers to which of the following circumstances?
a. Certain genes are induced only at a particular point in the life cycle. b. Certain genes are induced only in specific tissues. c. Heat-shock genes are induced during periods of temperature stress. d. "Housekeeping" genes are induced in response to a viral infection. e. Molecular chaperones are synthesized after heavy-metal ingestion
Which one of the following is true of your mRNA?
A. The mature mRNA is produced directly from DNA. B. A pre-mRNA is produced directly from DNA, and then a mature mRNA is created by the removal of introns. C. A pre-mRNA is produced directly from DNA and then a mature mRNA is created by the removal of exons. D. DNA is produced directly from mRNA.
Which of the following can be found in the mesohyl of a sponge? 1. amoebocytes 2. spicules 3. spongin 4. zygotes 5. choanocytes
A) 1 and 2 B) 2, 3, 4 C) 1, 2, 3, and 4 D) 1, 2, 3, 4, and 5
Which of the following keeps water from penetrating the vascular cylinder and forces the water to pass through the endodermal cells?
A. cortex B. pericycle C. Casparian strip D. root band