Ejaculation occurs when the sympathetic nervous system stimulates smooth muscles of the ductus deferens, ejaculatory ducts, and the prostate gland to contract.
The sympathetic nervous system has to do with many actions in our bodies, but also has an important effect on men during the state of sexual arousal. It affects their reproduction organ to fulfill the actions it was created to do during sexual intercourse.
The similarity between the the DNA and RNA molecules is that both of them are long polymers and they are made up of nucleotides.
The differences between the two molecules are as follows:
1. The sugar components of the DNA molecule are deoxyriboses while the sugar components of the RNA molecules are riboses.
2. The nitrogenous bases in DNA molecule are adenine, guanine, thymine and cytosine while the nitrogenous bases in the DNA molecule are adenine, guanine, uracil and cytosine.
3. The back bone of the DNA molecule is made of the deoxyriboses and phosphate while the back bone of the RNA molecule is made up of riboses and phosphate.
Answer:
D. 1 in a trillion bases
Explanation:
A mutagen agent can change the genetic information of organisms increasing mutations over the natural level. Mutagens cause changes in the bases, and pairing bases, that compose DNI strands.
A mistake in the process of DNI copy during cell division might cause genetic changes in daughter cells. Defects DNI replication might be inherited if it occurs in germinal cells. But it can also cause many significant epigenetic changes.
Many of these changes can be detected on time by enzymes such as DNI polymerase. This enzyme can correct these mistakes or at least some of them, moving from 3´to 5´direction, and eliminating the mistakes.
The highly effective replication system, together with the action of enzymes, makes it rare to occur a mistake in DNI replication. Generally speaking, the mistaken rates in DNI replication are very low, meaning that only one in a trillion times occurs a mistaken DNI copy.
Answer:
What effect do human activities have on natural resources?
Humans impact the physical environment in many ways: overpopulation, pollution, burning fossil fuels, and deforestation. Changes like these have triggered climate change, soil erosion, poor air quality, and undrinkable water.
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