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Anon25 [30]
3 years ago
10

A new and effective antibiotic becomes widely used for a particular species of bacteria. After some time, an antibiotic-resistan

t strain of the bacteria becomes prevalent. Which mechanism explains this phenomenon?
Biology
1 answer:
s2008m [1.1K]3 years ago
4 0
Antibiotic resistance happens when an antibiotic lost its ability in controlling or killing bacterial growth. At this moment the bacteria are already resistant to the antibiotic and are multiplying even though the drug is present. This is a natural phenomenon.
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How are land, air, water and living things impacted by too much carbon dioxide?
choli [55]

Answer:

- In terrestrial environments: increasing CO2 levels cause an increased photosynthetic rate

- In aquatic environments: increasing CO2 levels cause an increase in water acidity  

- In both terrestrial and aquatic environments: increasing CO2 levels lead to an overall increase in the average temperature (global warming)

Explanation:

In terrestrial ecosystems, rising carbon dioxide (CO2) levels increase the rate of photosynthesis (since CO2 is one of the reactants in photosynthesis), thereby also increasing plant growth. Moreover, in aquatic ecosystems, rising CO2 concentrations increase the levels of this gas dissolved on the surface of the oceans. This increases the acidity of the oceans, thereby modifying habitats and food web structures. The increasing acidity of the oceans also reduces the amounts of carbonate, which difficult for aquatic species (e.g., corals) to form their shells/skeletons. Finally, CO2 is a greenhouse gas that contributes to the increase in the average temperature by absorbing solar radiation that would otherwise have been reflected by the Earth's surface, and this increase in the temperature negatively affects life in both terrestrial and aquatic environments.

5 0
3 years ago
Many Japanese people consume a diet rich in seaweed, including the edible red alga Porphyra, which is used for preparing sushi.
horsena [70]

Answer:

Bacteroides plebeius which is present in the gut humans have the same genes to marine bacterium Zobellia galactanivorans.

Explanation:

many researchers findout that bacteroides plebeius acquired functional porphyranase and agarase genes from a marine bacterium called Zobellia galactanivorans. Zobellia galactanivorans is a marine bacterium which has the ability to digest complex polysaccharides such as agarose and porphyran. so due to similar genes, Bacteroides plebeius also digest polysaccharides such as agarose and porphyran present in sea weed.

3 0
3 years ago
A culture medium on which only gram-positive organisms grow and a yellow halo surrounds staphylococcus aureus colonies is called
ELEN [110]
I believe the most appropriate is a selective medium and differential medium. Selective medium types are formulated to support the growth of one group of organism, but inhibit the growth of another. Blood agar is a differential medium that distinguishes bacterial species by their ability to break down the red blood cells included in the media. Blood agar is often used to distinguish between the different species of pathogenic streptococcus bacteria.
4 0
3 years ago
A hypothesis is checked by
k0ka [10]

Answer:

by measuring and examining a random sample of the population being analyzed.

Explanation:

5 0
3 years ago
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When animals feed off of land faster than the plants can regrow, the land is _______.
ddd [48]

Answer:

c. overgrazed

Explanation:

plz mark B R A I N L I E S T

5 0
3 years ago
Read 2 more answers
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