Biology, 10.11.2020 20:30 jay4881

Which is occurring during conjugation? A. There is a change in the nucleotide sequence of a DNA molecule.

B. A bridge-like connection is created between bacterial cells for genetic material to
be transferred.

C. A bacterial cell takes DNA fragments from a dead cell and incorporates them into
their DNA molecule.

D. There is a transfer of DNA from bacterium to another by a virus.

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Answer from: nelly88

B. A bridge-like connection is created between bacterial cells for genetic material to be transferred.

Explanation:

A. There is a change in the nucleotide sequence of a DNA molecule. - this is describing a genetic mutation

B. A bridge-like connection is created between bacterial cells for genetic material to be transferred. - this is conjugation, a type of genetic transfer between donor and recipient bacterial cells. It is a way that bacterial cells achieve genetic variation. For example, bacteria can share antibiotic resistance genes between one another. They do not directly contact one another, instead, they use a structure called a pilus to exchange material

C. A bacterial cell takes DNA fragments from a dead cell and incorporates them into their DNA molecule. - this is transformation, another type of genetic transfer where bacterial cells take up bacterial DNA from the environment. These molecules of DNA are usually from dead bacteria

D. There is a transfer of DNA from bacterium to another by a virus. - this is another type of gene transfer called transduction, where a virus takes genetic material from one bacteria to another.

Answer from: Quest

answer: - b cells

explanation: -

there are many types of white blood cells present in our body. one such class of white blood cells are the lymphocytes. the b cells belong to the lymphocyte class of wbcs. the b cells perform their action against the pathogen by producing specialised proteins called as antibodies. these antibodies are produced as and when the b cells encounter pathogens in response to the antigens present on the surface of the pathogen. these antibodies bind to the antigens present on the pathogen and then, target them for destruction by other cells of the immune system.

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.

Answer from: Quest

Putuitary gland maybe i think so

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