Prostaglandins are under endocrine regulation
Indicate whether the statement is true or false.
ANS: F, autocrine or paracrine
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Placozoans (select all that apply)
A. are tiny animals containing only a few thousand cells. B. are simple animals, consisting of only 2 tissue layers that sandwich an interior fluid layer. C. are, in spite of their morphological simplicity, genetically complex, sharing many genes for transcription factors, signaling molecules, and structural proteins with both cnidarians and bilaterians animals. D. are a highly diverse group, consisting of many species occupying a wide range of habitats. E. are large radially symmetrical animals superficially similar to cnidarians and ctenophores.
How does the digestion and absorption of fat differ from that of carbohydrates?
A. Processing of fat does not require any digestive enzymes, whereas the processing of carbohydrates does. B. Fat absorption occurs in the stomach, whereas carbohydrates are absorbed from the small intestine. C. Carbohydrates need to be emulsified before they can be digested, whereas fats do not. D. Most absorbed fat enters the lymphatic system, whereas carbohydrates directly enter the blood. E. Fat must be partially digested by bacteria in the large intestine before it can be absorbed, which is not the case for carbohydrates.
Conservation biology is a ____
a. mature science b. young science c. science that addresses speciation rates d. science practiced by environmentalists e. declining science
Photoperiodism is the ____
a. duration of flowering in a plant b. amount of light needed by a plant to exhibit normal growth c. biological response of a plant to a change in the length of daylight relative to darkness d. light phase of photosynthesize during which photolysis of water occurs e. time of the day when light shines with the most intensity