Which statement about reptiles is true?
a. Scaly skin allows reptiles to live on land.
b. Reptile eggs are fertilized externally.
c. Reptiles generate their own heat.
d. Reptiles have a two-stage life cycle.
a. Scaly skin allows reptiles to live on land.
Reptiles Scaly skin allows reptiles to live on land.
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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. Primary B. Secondary C. Tertiary D. Quaternary
Which of the following junctions are important for cell signaling?
A. adherins junctions B. gap junctions C. plasmodesmata D. desmosomes E. All of the choices are correct.
Each villus contains a lacteal, which functions to:
a. absorb the products of lipid digestion. b. aid in the absorption of carbohydrates. c. aid in the absorption of water. d. secrete enzymes to aid in the absorption of fats. e. remove protein from the interstitial fluid.
Heavy metals in contaminated soils can be taken up by hyperaccumulating plants. Lead and cadmium taken up this way are often accumulated in the plants'
A. sclerenchyma. B. root nodules. C. trichomes. D. stomates. E. rhizomes.