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3 years ago

Why must most antibiotics be given some time to take effect on a disease-causing population of bacteria?

2 answers:

8 0

The correct answer is d. "Regeneration" means "forming new cells," and signifies that the disease-causing bacteria cells are multiplying. When there are more of these cells, there is a higher chance for antibiotic resistance (making it take longer for the antibiotics to work). Once there is a smaller concentration of these bacterial cells, the antibiotics become more effective.

DerKrebs [107]3 years ago

3 0

Answer:

The correct answer will be option-B

Explanation:

Antibiotic is the antimicrobial substance which inhibits the growth of the bacteria by interfering with different process and destroying the cell wall.

If the same antibiotic is used for the same colony of bacteria then bacteria can respond by becoming resistance to the antibiotic and as a result of this, the antibiotic becomes ineffective for the bacteria.

Since bacteria live for only a few days, therefore, the disease-causing bacteria dies off after a few days. The antibiotic then acts on the susceptible bacteria and kill the bacteria.

Thus, Option-B is the correct answer.

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To assess Mendel’s law of segregation using tomatoes, a true-breeding tall variety (SS) is crossed with a true-breeding short va

lapo4ka [179]

Answer:

0.949367 ≈ 0.95.

Explanation:

The chi square analysis can be done by the formula as follows:

Chi square = (O-E)²/E

Here, O is observed value and E is expected value.

The tall trait follows the Mendel's law, this means the cross between F1 results in the formation of progeny with ratio 3( tall) : 1 (short).

The observed values for set I is 63 tall, 16 short.

The expected value for tall plant = $\frac{3}{4}\times79$ = 59.25 .

The expected value for short plant = $\frac{1}{4}\times79$ = 19.75.

Put these value in the formula for chi square analysis:

For tall plants = ( 63 - 59.25)²/ 59.25= 0.237.

For short plants = (16 - 19.75)²/ 19.75 = 0.712

Total value for set I = 0.237 + 0.712 = 0.95.

Thus, the answer is 0.95.

6 0

4 years ago

Question 5

mestny [16]

The given options must be in the calories in approximate value.

Answer:

The best answer is - 710 calories approximately.

Explanation:

One ounce of the beer provides 12 calories and as it is given that Jonathan drinks five 12 ounce beers throughout the day then,

12 ounce = 12 × 12 × 5

= 144 × 5

= 720 calories

Thus, it is found out that he has added 710 calories approximately to his diet additional.

4 0

3 years ago

Which of the following describes a property of wood? A. Attracted to magnets B. Purple in color C. Melts at 0°C D. Solid at room

kolezko [41]

Wood is solid at room temperature.

3 0

3 years ago

Which of the following are ways the land can become polluted? Select ALL that apply

Lelu [443]

Answer:

all of them can cause pollution

Explanation:

4 0

3 years ago

Read 2 more answers

a human skin cell contains 46 chromosomes. A frog sprem cell conrains 12 chromosomes. which paie of number of a normal gamete fr

schepotkina [342]

Human 23, frog 12
Because gametes contain half the number of usual chromosomes, so a human gamete would have 46/2 or 23 chromosomes. A frog sperm cell is a gamete so it would have 12 chromosomes anyway.

Hope this helps :)

8 0

3 years ago