According to Chargaff's rule, the base pairing in the DNA and RNA is fixed. Adenine always pairs with Thymine in DNA and Uracil in RNA. Guanine pairs up with cytosine. This complementary base pairing is universal and constant. That's why amounts are also equal. It means if cytosine is 20% in any DNA sample, then amount of guanine would be 20% as well.

4 0

3 years ago

A given ecosystem has the following amounts of energy available at each trophic level: Primary producers: 4,000 gC/m2/day; Prima

schepotkina [342]

Answer:

b. Yes, the average efficiency is 10%

Explanation:

The average efficiency at each trophic level is 10% because there is about 10% of energy is transferred from one trophic level to another. In some trophic levels the efficiency of organisms is 20% but in most of the trophic level has 10% efficiency so that's why the average efficiency is 10%. Yes, this ecosystem obeys the Lindeman's Law for ecological efficiency due to its 10% of ecological efficiency.

4 0

3 years ago

Which way do the nitrogenous bases in DNA pair up

slamgirl [31]

Answer: Base pairs occur when nitrogenous bases make hydrogen bonds with each other.

Explanation: Each base has a specific partner: guanine with cytosine, adenine with thymine (in DNA), The hydrogen bonds are weak allowing it to "unzip"

6 0

3 years ago

How does farming affect water, land, and air?

eimsori [14]

Excessive irrigation can affect water quality by causing erosion, transporting nutrients, pesticides, and heavy metals, or decreasing the amount of water that flows naturally in streams and rivers.
Soil erosion due to land clearance and grazing. contaminated soils due to pesticides or overuse of fertilizers.
Air emissions from livestock operations make up 14.5 percent of global greenhouse gas. Livestock farming emits several greenhouse gases that contribute to climate change, and may also be subject to the effects of climate change due to increased animal stress in dealing with rising temperatures.

4 0

3 years ago