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mezya [45]
3 years ago
14

List four human activities that are current threats to biodiversity

Biology
1 answer:
devlian [24]3 years ago
5 0

It may be because;

  • Climate change
  • pollutions
  • Overpopulation
  • Global WARMING
  • Deforestration
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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<em> Bacillus subtilis, Streptocossus pneumoniae</em> while others  like <em>Escherishia coli </em>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.
3 0
3 years ago
What process can account for the phenomenon wherein a normal xy male produces a sperm carrying two y chromosomes?.
Rasek [7]

Answer:

second division nondisjunction

Explanation:

7 0
2 years ago
Explain nitrogen fixation
AnnZ [28]
Nitrogen fixation is a process in which nitrogen (N2) in the Earth's atmosphere is converted into ammonia (NH3). Atmospheric nitrogen or molecular dinitrogen (N2) is relatively inert: it does not easily react with other chemicals to form new compounds.
3 0
3 years ago
Please help me thank you
alekssr [168]

Answer:

3. A 2. B. 1. B

Explanation:

Im not to sure about 1. but other than that your good sorry if this didn't help

5 0
3 years ago
One adaptation that is unique to marine mammals is they___ a. can slow their heart beat down. b are warm-blooded.. . c. breathe
liberstina [14]
One adaptation that is unique to marine mammals is they nurse their young.. The correct option among all the options that are given in the question is the fourth option or the last option or option "d". I hope that this is the answer that you were looking for and the answer has come to your desired help.
5 0
3 years ago
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