Which of the following statements is true?
A. Tracheids are multicellular conduits,
whereas vessels are unicellular conduits.
B. Tracheids transport water, whereas
vessels transport sugars.
C. Tracheids are short and thin, whereas
vessel elements are much wider.
D. Tracheids compose the xylem, and vessel
elements compose the phloem.
E. Water enters tracheids through pits,
whereas water enters vessels only through
spaces between the cells.
C
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Which genetic map is derived from overlapping short pieces of DNA and is used to distinguish genes tens of kilobases apart?
A) Cytogenetic map B) Linkage map C) Physical map D) Sequence map
A thyroid disorder in which an excess of thyroid hormone is produced, causing anxiety, insomnia, heat intolerance,
weight loss, and tremors is known as ____. a. hypothyroidism b. goiters c. cretinism d. Graves' disease e. Hashimoto’s disease
The process illustrated in Figure 3-1 is called:a
condensation. b. protein synthesis. c. hydrolysis. d. dehydration synthesis. e. denaturation
In a negative feedback system, ____
a. the response of the integrator is aligned with the output of the sensor b. a sensor brings the system back to the setpoint c. a steady state condition cannot be identified d. the response of the integrator is opposite the output of the sensor e. the resulting outcome is always greater than the input