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Bogdan [553]
4 years ago
7

An antibiotic was effective 20 years ago against a specific type of a specific type of bacterial infection no longer works again

st the same kind of infection today. Which best explains why the antibiotic is no longer as effective as it was 20 years ago?
a. Bacteria resistant to the antibiotic have killed off nonresistant bacteria
b. have changed the structure of the bacteria that causes the infection
c. Resistant bacteria have survived and reproduced at a greater rate than nonresistant bacteria
d. The human body has developed an immunity to the antibiotics
Biology
1 answer:
Sliva [168]4 years ago
4 0

c. Resistant bacteria have survived and reproduced at a greater rate than nonresistant bacteria

Explanation:

The antibiotic is no longer effective as it was 20 years ago because the resistant bacterial have survived and reproduced at a greater rate than the non-resistant bacteria.

  • The antibiotics have specifically designed to exterminate the disease causing bacteria strain from the body.
  • While at that point in time, it is potent and does the work. Along the line, it will cause the structures of some other strains to change.
  • This will lead to the development of resistant breeds with time.
  • The resistant breed will then be able to survive the onslaught of the antibiotics making it not a good fit.

Learn more:

Selective force brainly.com/question/4602376

#learnwithBrainly

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A woman has blood Type A, her baby has blood Type AB: Is it possible that a man who has the blood Type A could be the father? Sh
Wittaler [7]

Answer:

No, it is not possible

Explanation:

Humans use the ABO blood group system where the A and B alleles are dominant over allele O but codominant with one another.

This system is such that;

Type A can only have genotype: iAiA or iAi

Type B can only have genotype: iBiB or iBi

Type AB can only have genotype: iAiB

Type O can only have genotype: ii

According to this question, a woman has blood Type A (iAiA or iAi) and her baby has blood Type AB (iAiB). This means that the father definitely contributed the allele B in order to have a baby with type AB. It also means that, according to the question, IT IS NOT POSSIBLE FOR A "Type A" father to produce that baby (see the punnet square attached).

Note: The father must contain an allele B in his genotype i.e. the father must be either type B (iBiB or iBi) or type AB (iAiB)

7 0
3 years ago
Each mastoid process is located on a(n) ______ bone and provides attachment for ______ muscles.
irakobra [83]

Each mastoid process is located on a <u>temporal </u>bone and provides attachment for <u>digastric </u>muscles.

<h3>What is the mastoid process?</h3>

The mastoid process is a bone present on the lateral side of the face. It is present in the mastoid process of is present on the area of the temporal bone.

The mastoid process allows the muscles to joins. It joins the sternocleidomastoid, the posterior belly of the digastric muscle, splenius capitis, and longissimus capitis.

Thus, the digastric muscles can attach to each mastoid process, which is found on a temporal bone.

To learn more about the mastoid process, refer to the link:

brainly.com/question/2158881

#SPJ4

3 0
1 year ago
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