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AVprozaik [17]
3 years ago
14

Which of the following statements is correct?

Biology
1 answer:
nekit [7.7K]3 years ago
3 0

Answer:

<h2> "Archaea are older organisms than eukaryotes" </h2>

<h2>Explanation:</h2>

Archean are group of organisms classified under the domain Archae bacteria. They are found in environments with extreme conditions e.g.

high temperature etc.

They are prokaryotic in nature i.e. they do not possess a membrane-bound nucleus in their cells.

Based on this, archaea are not classified under the same domain as bacteria (domain- protista). They are unicellular organism, archaea are older set of organisms than eukaryotes.

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3. How does fluoroquinolone affect bacterial cells but not eukaryotic cells?
Valentin [98]

Answer:

In order to be useful in treating human infections, antibiotics must selectively target bacteria for eradication and not the cells of its human host. Indeed, modern antibiotics act either on processes that are unique to bacteria--such as the synthesis of cell walls or folic acid--or on bacterium-specific targets within processes that are common to both bacterium and human cells, including protein or DNA replication. Following are some examples.

Most bacteria produce a cell wall that is composed partly of a macromolecule called peptidoglycan, itself made up of amino sugars and short peptides. Human cells do not make or need peptidoglycan. Penicillin, one of the first antibiotics to be used widely, prevents the final cross-linking step, or transpeptidation, in assembly of this macromolecule. The result is a very fragile cell wall that bursts, killing the bacterium. No harm comes to the human host because penicillin does not inhibit any biochemical process that goes on within us.

hope this helps :) can i get brainliest?

Explanation:

5 0
3 years ago
Read 2 more answers
how many possible poisoning are reported each year in the united states for children under the age if six?
BaLLatris [955]

Answer:

6.4 poison exposures/1000 population, 37.4 poison exposures in children younger than 6 years/1000 children, 1 poison exposure reported to U.S. poison control centers every 15 seconds.

Explanation:

6 0
3 years ago
You are studying an animal and inject fluorescein, a fluorescent dye, into a single cell on the surface epithelium of the animal
Viktor [21]

Answer:

The cells are connected by gap junctions.

Explanation:

A gathering of protein channels, which permits small molecules and ions to move between the neighboring cells is termed as a gap junction. The protein channels that form gap junctions comprise two connexons, of which one is situated in the membrane of one cell that combines and aligns with the connexon of the adjacent cell.  

This association produces a spontaneous pathway, which permits the small molecules and ions to pass passively from one cell to another. The gap junctions are found in all the kinds of cells, however, they are not found in skeletal muscle, RBCs, and blood lymphocytes.  

Thus, the passing of the fluorescent dye from one cell to another shows that the two cells are connected with the help of gap junctions.  

8 0
3 years ago
What action(s) may take place at the elbow from its current position?
Y_Kistochka [10]

Answer:

The elbow may flex or probate from its current anatomical position

3 0
3 years ago
What is nondisjunction in meiosis?​
GarryVolchara [31]

Answer:

failure of a pair of homologous chromosomes to separate in meiosis I, failure of sister chromatids to separate during meiosis II, and failure of sister chromatids to separate during mitosis. Nondisjunction results in daughter cells with abnormal chromosome numbers (aneuploidy).

Explanation:

3 0
3 years ago
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