Is natural selection considered a biotechnology? Why or why not?

Biology

1 answer:

Westkost [7]3 years ago

3 0

No, Humans take evolution through selective breeding and genetically modified organisms.

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What term is used to describe bacterial cells that can naturally take up dna from their environment?

Maru [420]

<h2>The correct answer is: Competent cells</h2>

Explanation:

Bacterial cells have the capability of incorporating foreign naked DNA or deoxyribonucleic acid fragments from the environment or the exterior of the cell to the interior of the cell. This process is known as Transformation.
The bacterial cells which are able to undergo transformation are called Competent bacterial cells.
Some of the bacterial cells are naturally competent like Bacillus subtilis, Streptocossus pneumoniae while others like Escherishia coli need to be chemically treated to make them artificially competent.
In natural competence, the foreign DNA from the cell exterior is incorporated into the cell interior through specific protein complexes present in the plasma membrane of the bacterial cells.
In artificial competence, the negative charge on foreign DNA is masked by positively charged calcium ions (so that it is not repelled by the negative charge of the lipid bilayer of the bacterial cell plasma membrane) and then small pores are created in the lipid bilayer of the plasma membrane of the bacterial cells by giving a heat shock to the cells. This results in the uptake of the DNA by the bacterial cells.

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2 years ago

DNA replication is Group of answer choices conservative. a one-step process. semi-conservative. not carried out by enzymes. not

Alex787 [66]

Answer:

The correct answer is: semi-conservative.

Explanation:

DNA replication is an important process in which the DNA is duplicated before cell division so each daughter cell can have a copy of genetic material.

DNA replication is semi-conservative because one strand of DNA is new and the other one is the old strand. To replicate itself, the DNA double helix is opened, and then each strand serves as a model for the new strands.

DNA replication is not a one-step process, as it takes several complicated steps in which lots on enzymes participate (like DNA polymerase and DNA helicase).

DNA replication is also carried by prokaryotic cells, though it's a much simpler process.

5 0

3 years ago

Water vapor in the air can be high or low, depending on your location. Water vapor is a _____.

Marizza181 [45]

variable gas hope this helps

4 0

3 years ago

Read 2 more answers

what does the increase in incidents of polar bears visiting human settlements indicate

snow_lady [41]

The correct answer is "limited prey is driving the bears to seek food in human settlements".
Due to the warming of the Arctic waters, the ice is melting, resulting in a serious decline of floating winter ice. Polar bears need these floating parts of ice to hunt, therefore this new situation limits the hunting opportunities of the bears. That is why polar bears are driven to human settlements to look for food.

8 0

3 years ago

If the speed of an object does NOT change, the object is travling at ____ speed.

Juliette [100K]

Answer:

a constant

Explanation:

4 0

2 years ago