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Ksenya-84 [330]
3 years ago
15

Penicillin is an antibiotic that was discovered in 1928. Today many species of bacteria have acquired resistance to penicillin.

This adaptation occurred as a result of

Biology
2 answers:
Oksi-84 [34.3K]3 years ago
4 0

Answer:

THE ANSWER IS C ( genetic mutation) ON USATestPrep because...

Explanation:

Many bacteria have acquired the ability to produce an enzyme called penicillinase, which destroys penicillin. All enzymes are proteins. The ability to produce the new protein penicillinase came from a change in the bacterial DNA: a genetic mutation.

mr Goodwill [35]3 years ago
3 0
Genetic mutation is the answer to your question
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Why do you think weather scientists use percentages instead of saying “it will definitely rain today”?
grigory [225]

Answer:

Right now, I am in college for climatology, but before I decided on climatology, I was taking classes in Meteorology, the study of weather. So, I will answer your question. All meteorologists like to be right, but since the weather is so spontaneous, it is really hard to be right. Meteorologists use percentages because it helps them be professional. Also, because, different parts of the region where they are may or may not get the rain. I don't know where you are from, but I will use my hometown. In McAlester, Oklahoma, there may be a 70% chance of rain, but in another part of the region at Tulsa, Oklahoma ( which is 91 miles north of McAlester) there may be a 40% chance of rain. The difference in the percentages can vary from how stable the environment is, altitude, location, and terrain. That is two of the reasons why Meteorologists use percentages to predict weather.

Explanation:

7 0
3 years ago
Which answer helps to explain why all living cells need ph buffers?
defon

Answer;

Amino acid side chains have many carboxyl and amino groups.

Explanation;

-A buffer solution is a solution that resists changes in pH when small quantities of an acid or an alkali are added to it. It is a chemical substance that helps maintain a relatively constant pH in a solution, even in the face of addition of acids or bases.

-Buffering is important in living systems as a means of maintaining a fairly constant internal environment, also known as homeostasis.Small molecules such as bicarbonate and phosphate provide buffering capacity as do other substances, such as hemoglobin and other proteins.

- Protein buffer systems depend upon proteins, as opposed to nonprotein molecules, to act as buffers and consume small amounts of acid or base. Since amino acids have the capability of reacting with both acid and base, they naturally act as buffers.

4 0
3 years ago
What is a benefit that algae provide to humans and other organisms?
Keith_Richards [23]
Algae produces a estimated 30-50 percent of the net global oxygen .
3 0
3 years ago
Which of the following statements does not apply to the K value in the equation for the oxygen binding curve of myoglobin? A) It
steposvetlana [31]

Answer:

D) If Y > K, then myoglobin is less than 50% saturated with oxygen.

Explanation:

a regular curve is displayed by myoglobin. when the concentration of oxygen is decreased, the myoglobin will saturate very quickly which means that the myoglobin have very high affinity for the oxygen and dont  easily release oxygen.

so if Y>k, then myoglobin is less than 50% saturated with oxygen.

6 0
3 years ago
Christopher Columbus used the presence of suspended seaweed in the ocean to
Alecsey [184]
Your answer is d he saw brown algae
5 0
3 years ago
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