Luke sprained his ankle, tearing some of the collagen protein that forms his ligaments. Some types of collagen consist of three polypeptide chains twisted together to form a rope-like strand. What level of protein structure does this rope-like strand represent?
A. Quaternary
B. Secondary
C. Primary
D. Tertiary
Answer: A
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A dome-shaped mass of cells that protects the bottom of the root as it pushes through soil is called the root ________
a. epidermis b. apical meristem c. cap d. tip
Which of the following pairs indicates the closest
macroevolutionary link among the bacteria according to the evolutionary history tree in the text? a. green sulfur; spirochetes b. chlamydias; cyanobacteria c. green sulfur; green nonsulfur d. spirochetes; proteobacteria e. proteobacteria; cyanobacteria
How is the mycelium a valuable adaptation for a fungus?
A. It discourages animals from feeding on the fungus. B. It provides a strong anchor for the fungus. C. It provides physical support for the fragile sporophyte generation. D. It provides a vast surface area for the generation of spores. E. It provides a large surface area for the absorption of nutrients and moisture.
A nucleus of the hypothalamus that contains high concentrations of both leptin receptors and insulin receptors
What will be an ideal response?