Restriction enzymes are enzymes used as cutting tools in making recombinant DNA. They are also called restriction endonuclease, a protein produced by bacteria that cleaves DNA at specific sites along the molecule. In a bacteria cell they cleave foreign DNA, thus eliminating infecting organisms.
Answer:
The addition of an extra chromosome usually occurs spontaneously during conception. The cause of this is unknown and prevention is not possible. The most important risk factor for trisomy conditions is maternal age. Women in their late 30s and 40s have a higher chance of trisomy conditions occurring.
Answer:
D. None of the above
Explanation:
all the answer choices are found in soil
1) Carbon is removed from the air by photosynthesis in plants
2) Feeding, from animals, passes carbon along food chain/web
3) Carbon dioxide is released back into the air by:
-animals & plants respiring
-bacteria/fungi acting as decomposers
-Burning of fossil fuels (combustion)
Pic at the top is from my old biology book, incase u don't understand it still.
Hope I helped :)
Correct answer: C) Increasing surface area to improve nutrient absorption between the digestive and circulatory systems
The small intestine contains a large number of small finger-like projections called villi, which increases the intestinal surface area and help in the absorption of nutrient from the intestine.
These villi consist of numerous blood vessels, which absorb the food and transport it to the bloodstream.