Four of the following statements are true of xylem. Which one is the exception?
A. Conducts water up the plant
B. Conducts mineral ions up the plant
C. Connects with roots
D. Connects with leaves
E. Transports sugars
Answer: E
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A yeast artificial chromosome (YAC) is a ____ that can accommodate large DNA inserts and uses the eukaryote yeast
as a host cell. a. restriction enzyme produced from yeast chromosomes b. labeled nucleic acid used to identify a clone within a genome and c. q arm of chromosome 15 within a cell that encodes for a restriction enzyme and d. cloning vector that has telomeres and a centromere e. cloning vector that has 23 chromosomes
Sometimes plants produce embryos in seeds without meiosis and fusion of gametes. This process is
known as: a. coevolution. b. apomixis. c. self-pollination. d. mitosis. e. suckering
A 67-year-old man, who is an avid gardener, presents at an emergency department. He is suffering from spastic paralysis, which began in his right hand and now extends to his jaw muscles (Lock Jaw). The causative agent of this infection produces a virulence factor with which of the following activities?
A. Blockage of the release of the inhibitory neurotransmitter glycine. B. Blockage of the release of the neurotransmitter acetylcholine from synaptic vesicles. C. Overstimulation of T cells with resulting massive release of cytokines. D. Inhibition of Elongation Factor 2 (EF-2), resulting in inhibition of protein synthesis.
Which of the following solutes is not normally found in the plasma of mammals?
A. Ions B. Globulins C. Hemoglobin D. Metabolites, wastes, and hormones E. Albumin