What processes are responsible for transport of ions such NO3
- and Na+? Do the processes differ and
what is the consequence of a failure of transport of the ions?
What will be an ideal response?
Both of these ions are transferred by secondary active transport powered by a H+ gradient. Most
organic compounds such as NO3
- move into plant cells by a process called symport. Here the potential
energy released as H+ follows its gradient is coupled to the uptake of ions such a NO3
-. NO3
- would
then be used in the cell, for example, to provide N for proteins. On the other hand, Na+ is removed
from the cell so that excess is removed. If the Na+ were not eliminated, it would quickly build up to
toxic levels.
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It is usually beneficial to add nitrogen when one attempts to stimulate hydrocarbon degradation in the ocean.
Answer the following statement true (T) or false (F)
Four of the five answers listed below assist in chromosome movement. Select the exception
a. microtubule b. spindle microtubules c. centromeres d. centriole e. nuclear envelope
Which of the following statements is NOT a
possibility even though the phylogenetic lineages for hominids are not definitive? a. Homo preceded Australopithecus. b. Homo sapiens is the most recent. c. Australopithecus is probably more ancient than Homo. d. Homo erectus preceded Homo sapiens. e. Homo and Australopithecus may have evolved at the same time.
The DTP vaccine protects against _________.
A. tuberculosis B. diptheria C. polio D. two of the above E. all of the above