Streptococcus mutans obtains energy by oxidizing sucrose. This bacterium is abundant in the mouths of Western European and North American children and is a prominent cause of cavities. The organism is virtually absent in children from East Africa, where tooth decay is rare. You hypothesize that cavities in Western children are due to an excess of sucrose in the diet. Which of the following would you include in a study designed to test your hypothesis?
a. Inoculate the mouths of a group of Western children with S. mutans.
b. Culture S. mutans from African children, sequence its DNA, and compare to Western S. mutans.
c. Switch a group of East African children to a diet that contains sucrose.
d. Check for S. mutansin the mouths of Western children after their cavities are filled.
e. See whether S. mutansis common in the mouths of Australian and Asian children
Answer:
Option c is correct
Switch a group of East African children to a diet that contains sucrose.
Explanation:
This action would help determine whether the abundance of the bacterium that causes dental cavity is due to the abundance of sucrose in the western diet and north American diet.
Answer:
a) Breccia
b) Shaly sand rock
c) Shale
d) sandstone
e) Corbonate rock
f) limestone
g) Rock salt
Explanation:
a) Breccia : given that it is made of quartz and rock fragments positioned in angular shape
b) Shaly sand rock : it is made up very small sandy like sediments ( also major composition is quartz and clay
c) Shale : This sedimentary rock is shale because of the nice/fine set up of its mud size sediments/particles
d) sandstone: as seen in its texture and composition
e) Corbonate rock : it is mainly dominated by dolomites
f) Limestone ; It is limestone because limestone is a chemical sedimentary rock that is dominate by calcite
g) Rock salt : It is a Rock salt because of the presence of Halite
Answer: Actually getting up and walking like God intended us to.
The answer is Mesopotamia. Hope I could help :)
