About the question:
You will find the diagram used to answer the question in the attached files.
Answer:
D) Some of the bacterial population was resistant to this antibiotic.
Explanation:
The term resistance refers to an inheritable change in a population sensitivity, reflected through the consecutive failure of the chemical effects, correctly used to reach a desired effect on the target population.
The excessive use of antibiotics on the bacteria population leads to the fixation of new mutated genes -by natural selection-. The mutated genes make these cells even more resistant to the drug.
In the exposed example we have,
- Day 1 ⇒ a big population of white bacteria and only one black cell, probably <em>carrying mutated genetic material</em>.
The population was treated with antibiotics.
- Day 2 ⇒ there are fewer white bacteria and three black cells. This means that white bacteria are dying, while the black ones are reproducing.
The mutated phenotype gets to survive under the effects of the chemical.
- Day 3 ⇒ There are no more white bacteria. Only the black population survived and keeps reproducing.
The mutated bacteria reproduce with the capability of tolerating the antibiotic dose that is usually used to destroy a population of white bacteria.
- Day 4 ⇒ Black bacteria got to survive a produce a big population. Remember that <em>bacteria follow the exponential growth model, </em>meaning that their reproductive rate is too high. This black population survived the antibiotic action and reproduced at high rates.
The Sahel. The Sahel is a region of sub-Saharan Africa and it is also a zone of ecological transition between the Sahara to the north and the wetter savannas to the south. Sahel belt or Sahel is a tropical savanna ecoregion in Africa. Africa is the second largest continent. It has 54 sovereign countries.
Answer:
B
Explanation:
While solar energy is derived from other resources, the fishing, tourism, and oil industries all have a hand in the pot.
<em>Rosalind Franklin decided she wanted to be a scientist at age 15. She trained as a chemist, was an expert in deducing the structure of molecules by firing X-rays through them. Her images of DNA were used without her knowledge, where she later went on to do pioneering work on the structures of viruses. </em>
<em>She died of ovarian cancer at age 37, before she could be recognized for the magnitude of her work.</em>
Rosalind Franklin's critical contributions were the understanding of molecular structures of RNA, DNA, certain viruses, coal and graphite. Franklin contributed that DNA molecules are shaped like a twisted ladder. Her photographs and studies provided evidence that DNA is made up of more than a single strand of nucleotide's.
She innovated the resolution of the cameras used in order to obtain the most detailed images yet of X-ray diffraction of DNA. The detailed images allowed her to make <em>exact </em>measurements related to the structure of DNA.
Answer:
natural selection causes populations to become adapted. evolution is natural selection ;)
Explanation:
i took a test:)
