All of the following cell types are correctly matched with their functions except
a. mesophyll-photosynthesis.
b. guard cell-regulation of transpiration.
c. sieve-tube member-translocation.
d. vessel element-water transport.
e. companion cell-formation of secondary xylem and phloem.
Answer: e. companion cell-formation of secondary xylem and phloem.
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Which of the following pairs is mismatched?
A. Poison ivy dermatitis - type IV hypersensitivity B. Transfusion reaction - type II hypersensitivity C. Serum sickness - type III hypersensitivity D. Food allergy - type I hypersensitivity E. Hay fever - type IV hypersensitivity
What must be true of any organ described as vestigial?
A) It must be analogous to some feature in an ancestor. B) It must be homologous to some feature in an ancestor. C) It must be both homologous and analogous to some feature in an ancestor. D) It need be neither homologous nor analogous to some feature in an ancestor.
What is the importance of measurement to science?
What will be an ideal response?
Genetic regulation in eukaryotes can take place at a variety of levels from transcriptional to posttranslational. At what level is genetic regulation considered most likely in prokaryotes?
A) transcriptional B) intron processing C) capping D) polyadenylation of the 3' end of the mRNAs E) exon processing