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Veseljchak [2.6K]
3 years ago
15

A scientist wishes to test a new antibiotics ability to treat bacterial infections. she tests her hypothesis that the antibiotic

will effectively treat a stubborn bacterial infection by infecting rats with a stubborn infectious bacteria and treating them with the new antibiotic, she then determines how many of the rats recover from the infection. what is missing from her experimental design?
Biology
1 answer:
MrMuchimi3 years ago
4 0

Answer:

Explanation:

Antibiotics are medicines used to kill bacteria. Over time, certain groups of these germs may adapt to these medicines. They may change in such a way that antibiotics can′t kill them. The term for this is antibiotic resistance.

Bacteria are very small organisms. They can enter your body. Some of them are harmless and may be helpful. But some of these germs can be harmful. When these multiply inside your body, they can cause disease.

Before antibiotics, people often got very sick from bacterial infections. With these medicines, it is now easy to treat many of these infections.

Antibiotic resistance is a serious concern throughout the world. It can lead to illnesses that are very hard to treat. Standard antibiotics for treating a disease may no longer work in these cases. Other medicines may also not help. As a result, resistance to antibiotics is becoming more common.

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What is the difference between simple diffusion and facilitated diffusion?
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Answer:

Simple diffusion is when the particles travel through the cell and facilitated diffusion is when the molecules travel through the cell.

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3 years ago
Explain how both the digestive system and the urinary system work to conserve water in the human body.
Ghella [55]
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The digestive system is important because in its lower parts, liquids are absorbed and inserted in the bloodstream. Then through the bloodstream, they travel to all parts of the body and are absorbed by cells as needed. When blood passes through the body, it gets to the kidneys where water and electrolytes are filtered, reabsorbed if needed and excreted through the urine. 

Now, if the brain has a signal that the body has a lack of liquids, it activates hormones which influence the bloodstream in both the digestive and the urinary system. In this case, the digestive system will absorb more liquids from food because the hormones will make the blood vessels in the digestive area larger, and on the other hand, we will produce less urine because the kidneys will get an assignment from the brain to filter liquids, but to reabsorb them again as much as possible. 
3 0
3 years ago
Read 2 more answers
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5 0
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Explain how the force of air resistance depends on an object's speed
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4 0
3 years ago
8. Two rabbits are bred together. One is heterozygous for agouti coat
dusya [7]

Answer:

- Parental cross = Cch  x chch  

- F1 = 1/2 Cch (agouti coat); 1/2 chch (albino coat) >> 1:1 phenotypic ratio

Punnett  square:  

          ch         ch

C       Cch       Cch

ch    chch      chch

 

Explanation:

A heterozygous individual is an individual who has two different gene variants (i.e., alleles) at a particular <em>locus</em>. In this case, individuals having the "agouti coat" trait are heterozygous carrying both 'C' and 'ch' alleles. On the other hand, a homo-zygous individual has the same allele at a given <em>locus</em> (here, the 'chch' genotype associated with the albino phenotype). Therefore, as observed in the Punnett Square above, when a heterozygous parent is crossed with a homo-zygous recessive parent for a single gene, alleles segregate in the gametes of both parents so an expected 1:1 phenotypic ratio will be observed.

4 0
3 years ago
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