Question

question 10
1 point
which statement is true regarding the bacteria present in the stomachs or intestines of humans?
a all of these choices are correct.
b many intestinal bacteria aid in digestion.
c some stomach bacteria have been associated with cancers.
d intestinal bacteria may play a role in immune system function.
e intestinal bacteria can produce important vitamins.

Explanation:

• Option B: Intestinal bacteria like Bifidobacterium help break down complex carbohydrates and fibers that the human body can't digest on its own.
• Option C: Helicobacter pylori, a stomach - dwelling bacterium, is associated with an increased risk of gastric cancer.
• Option D: Intestinal bacteria interact with immune cells. For example, they can stimulate the production of immune - related molecules and help train the immune system to distinguish between harmful and harmless substances.
• Option E: Intestinal bacteria can produce vitamins such as vitamin K and some B - vitamins (e.g., biotin, folate).

Since all of the statements (B, C, D, E) are correct, option A (All of these choices are correct) is the right answer.

Answer:

A. All of these choices are correct.