Which element is a macronutrient in plants?
a. sodium
b. calcium
c. manganese
d. zinc
e. copper
b
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. The substance that typically provides rigidity to fungal cell walls, and is found in some animals, is
____.
a. lignin b. cellulose c. starch d. collagen e. chitin
Assuming that a particular disorder is caused by an allele of a single gene, what feature of a pedigree would allow one to conclude that the disorder was caused by a dominant allele?
A. Two unaffected parents have an affected child. B. Two affected parents have an unaffected child. C. An affected mother only has affected sons. D. All of the descendants of a particular affected person are also affected
After working a 12 hour shift at the hospital Louisa comes home and lies down on her bed. She is lying on her back looking up at the ceiling with her head resting on her arms. What is her body position?
a. Prone b. Anatomical position c. Supine d. Lateral e. Medial
Acetylcholine is a signaling molecule that elicits responses from heart muscle cells, salivary gland cells, and skeletal muscle cells. Which of the following statements is false?
(a) Heart muscle cells decrease their rate and force of contraction when they receive acetylcholine, whereas skeletal muscle cells contract. (b) Heart muscle cells, salivary gland cells, and skeletal muscle cells all express an acetylcholine receptor that belongs to the transmitter-gated ion channel family. (c) Active acetylcholine receptors on salivary gland cells and heart muscle cells activate different intracellular signaling pathways. (d) Heart muscle cells, salivary gland cells, and skeletal muscle cells all respond to acetylcholine within minutes of receiving the signal.