Suppose George Washington completely removed the bark from around the base of a cherry tree but was stopped by his father before cutting the tree down
The leaves retained their normal appearance for several weeks, but the tree eventually died. The tissue(s) that George left functional was/were the _____.
A) phloem
B) xylem
C) cork cambium
D) cortex
E) companion and sieve-tube members
Answer: B
You might also like to view...
Which of the following exhibits an antagonistic relationship?
A) PTH/aldosterone B) TSH/thyroxin C) renin/ANP D) insulin/glucagon
Which animals would be classified as continuous feeders?
A. worms, clams, and crayfish B. clams, crickets, and dolphins C. clams, baleen whales, and oysters D. oysters, hummingbirds and planarian E. None of these groups are all continuous feeders.
Different species of animals have very different nutritional requirements and gastrointestinal tract (GIT) specializations, depending on their primary diets
For example, carnivorous animals have relatively short small intestines, fast gut passage rates, and high protein requirements, in accordance with the high-protein, easily digested prey they consume. Based on your knowledge of nutrition and digestion and on the example provided in this scenario, what do you conclude about ruminants, which eat low-protein, difficult-to-digest plant leaves? A) Their GITs and nutritional requirements are similar to those of carnivores, and they must also eat some animal prey to obtain enough dietary protein. B) They have reduced protein requirements, long GITs, and slow gut passage rates to extract as many nutrients as possible from their diet. C) They have reduced protein requirements but GITs and gut passage rates similar to those of carnivores. D) They have normal nutritional requirements but extremely short GITs and fast gut passage rates to maximize the amount of food passing through the GIT.
In general, which of the follwoing will diffuse across a lipid bilayer most rapidly.
a. Small hydrophillic molecule b. Small hydrophobic molecule c. Large hydrophillic molecule d. Large hydrophobic molecule