Which of the following is a similarity between xylem and phloem transport?
A) Many cells in both tissues have sieve plates.
B) Expenditure of energy from ATP is required.
C) Transpiration is required for both processes.
D) Bulk flow of water is involved.
D
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Answer the following statements true (T) or false (F)
1. Plant cell membranes contain cholesterol. 2. Diffusion is the movement of a molecule from an area of high to low concentration. 3. Osmosis describes the movement of water from an area of high to low solute concentration. 4. Movement of molecules down their concentration gradient can drive the movement of a different molecule against its concentration gradient.
Why is it probably not a good idea to drink water directly from a mountain stream (i.e., untreated) even if it appears to
be unaffected by human activities?
What will be an ideal response?Small ribonucleoprotein particles (snRNPs) are involved in ____
a. mRNA splicing b. initiation of transcription c. aminoacylation of tRNA d. initiation of translation e. termination of translation
Choose the one most appropriate answer for each.
A. Trachea B. Chemoreceptors C. Oxyhemoglobin D. Larynx E. Sympathetic nerves F. Medulla oblongata G. Pharynx H. Respiratory cycle I. Bronchi J. Epiglottis K. Intercostal muscles L. Alveoli