Four of the following statements are true regarding roots. Which one is NOT true?
A. Roots anchor a plant in soil, and in many species, they store nutrients.
B. An extensive root system provides a plant with a very large surface area for absorbing water from the soil.
C. When a seed germinates, the first structure to emerge from it is a root.
D. In typical monocots, a primary root is quickly replaced with a mat of adventitious roots.
E. In typical eudicots, the primary root that emerges from a seed thickens and lengthens to become a fibrous root.
Answer: E
You might also like to view...
If autophosphorylation of CheA protein does not occur, then Escherichia coli cells must be
A. rotating flagella clockwise. B. tumbling. C. in a gradient of a chemorepellant. D. in a gradient of a chemoattractant.
Matching. Choose the most appropriate answer for
each. 1. ___ millipede 2. ___ annelids 3. ___ arthropods 4. ___ placozoan 5. ___ cnidarians 6. ___ echinoderms 7. ___ flatworms 8. ___ rotifers 9. ___ mollusks 10. ___ roundworms 11. ___ sponges A. two pairs of legs per segment B. tiny, flattened, crawling forms C. planarians, flukes, tapeworms D. nematodes E. snails, squids, clams F. wheel animals G. flagellated collar cells present H. jellyfish and corals I. crustaceans, ticks, and insects J. polychaetes, earthworms, leeches K. sea urchins, sea stars
Which statement best describes why packed red blood cells are usually transfused instead of whole blood?
A) Whole blood contains antibodies that could attack the recipient's antigens on their red blood cells. B) Packed red blood cells are smaller than whole blood cells and therefore enter the bloodstream faster than whole blood. C) Whole blood contains plasma proteins that could cause edema in the patient. D) Packed red blood cells provide the red blood cells the recipient needs without adding plasma that may change their fluid volume too much. E) Whole blood is diluted with plasma so the recipient might not receive the needed number of red blood cells.
FRAP has revealed that some proteins movement is restricted in cell membranes much more than in artificial bilayers. Which of the following could account for limited mobility of proteins in cell plasma membranes?
a. anchorage to the cell cytoskeleton. b. anchorage to the extracellular matrix. c. associations with other proteins. d. diffusion barrios e. all could limit protein mobility