On a short-term basis, water loss in plants may be controlled by the
A. opening of the stomata in the leaves to allow more carbon dioxide to enter.
B. closing of the stele in the roots.
C. bending of the petioles on the leaves.
D. opening the Casparian strips in the roots.
E. closing of the stomata in the leaves to limit transpiration.
Answer: E
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A. chemiosmotic. B. substrate-level. C. respiration. D. conformational change.
How many chromosomes are found in a single human cell at the end of each of the following mitotic stages? ________ prophase ________ metaphase ________ anaphase ________ telophase
What will be an ideal response?
Substance E is made in the pancreas, travels through the blood, and binds to a surface receptor on a target cell. After
dimerization and autophosphorylation, the receptor activates a signaling protein. Substance E is therefore the ligand for ____.
a. a receptor tyrosine kinase b. a G-protein-coupled receptor c. a hormone receptor d. a ligand-gated ion channel e. guanylyl cyclase
Which of the following is NOT an autoimmune disease?
A. HIV B. myasthenia gravis C. type I diabetes D. multiple sclerosis E. All of these conditions are autoimmune diseases.