Every so often you will hear a news story about sharks traveling up a river chan

Question

Every so often you will hear a news story about sharks traveling up a river channel. In fact they have been documented traveling up the Mississippi River as far north as Illinois. (!) Which of the following statements about their water/ion balance would you expect to be true. These animals are ionoconformers. These animals are euryhaline. These animals are stenohaline. These animals are osmoconformers. Which of the following is not a method of capturing nutrients missed by the small intestine (i.e. nutrients that pass through the small intestine without being absorbed)? Fermentation. Cecotrophy Coprophagy. Transamination Which of the following is not a characteristic of bird digestive systems relative to mammal digestive systems? Shorter retention times for food in the gastrointenstinal tract compared to mammals. Longer gastrointestinal tracts compared to mammals. Absence of microbial fermentation Similar reaction rates as mammals With respect to antibodies, which of the following statements is false, The antigen binds to the light chain of the antibody the diversity of antibodies is determined genetically and by prior exposure to an antigen. The antigen binding site on one antibody will also recognize very diverse antigens the heavy chain is similar among antibody classes. Permeability of the intestine to solutes is mainly a function of which structure? Esophagus. Tight junctions. Caecum. Stomach. Which of the following is NOT an example of autoenzymatic digestion? Stomach acid breakdown of sugars. Pepsin breakdown of proteins Microbial fermentation of proteins. Amylase breakdown of starches in saliva

Explanation / Answer

1. these animals are euryhaline.

An example of these sharks is bull shark that can live in sea water as well as fresh water.

2. Transamination

3. longer gastrointestinal tracts compared to mammals.

4. the antigen binds to the light chain of the antibody. This statement is false regarding antibodies.

5. tight junctions are responsible for solute permeability of the intestines

6. microbial fermentation of proteins is not an example of autoenzymatic digestion

Autenzymatic digestion refers to the mode of digestion with animals own set of proteins. In case of microbial fermentation ,the microbe produces enzymes to digest the proteins.

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