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padilas [110]
3 years ago
13

When bacteria possess genetic variations that allow them to survive the presence of certain chemicals we call that

Biology
1 answer:
nikitadnepr [17]3 years ago
3 0

Answer:

Mutation

Explanation:

Mutation is the process whereby some organisms possessed some characteristics that make them to be resistance to certain stimuli.

In this case,some bacteria have become resistance to chemicals or drugs to the possession of some things or features during development. These things make them different from other strains of that same bacteria.

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Which cells in the liver perform this function of removing bacteria and foreign material from the portal blood?
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Kuppfer's Cell, monocytes, and lymphocytes
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How do primary air pollutants differ from secondary air pollutants
mamaluj [8]
A primary air pollutant is directly from the source and secondary pollutants are omitted from two or more different primary pollutants interact with each other in the atmosphere.
EX of primary: carbon monoxide, nitrogen oxide, sulfur oxid
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3 0
3 years ago
Top-level predators help keep the number of many species in balance. These predators would belong to which group? A. invasive sp
Harrizon [31]
  • keystone species is the correct answer.

<u>keystone species</u> which keeps the number of other animal population in

control and low in the entire ecosystem. They play an important role

through this process and helps the food chain effectively.

dominant species - most common species; found often in the ecosystem.

invasive species - which fights for itself survival and can cause harm to

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4 0
2 years ago
4 Which of the following is the importance of<br>mitosis?<br>manakah adalah​
Colt1911 [192]

Answer:

It plays an important part in the development of embryos, and it is important for the growth and development of our bodies as well. Mitosis produces new cells, and replaces cells that are old, lost or damaged. In mitosis a cell divides to form two identical daughter cells.

Explanation:

4 0
2 years ago
Bone formation begins when ____________ secrete the initial semisolid organic form of bone matrix called ____________ .
butalik [34]

Answer:

a. osteoblasts

b. osteoid

Explanation:

Osteoblasts are the fundamental cell of bone tissue. They are the cells that synthesize the bone matrix called osteoid from which it is made from the skeleton of bone fish, to the skeleton of humans. Since the bone skeleton is an evolutionary paraphiletic characteristic (it is present in several taxonomic groups that have evolved from the same ancestor).

Osteoblasts are responsible for the development and growth of bones during the juvenile stage of individuals and are also responsible for maintaining adult bone and regenerating bone when it breaks.

Osteogenesis is the process of differentiation of osteoblasts. The cells from which osteoblasts differ are called osteoprogenitors. The differentiation of osteoprogenitor cells, which come from the mesoderm, periosteum or bone marrow, is induced by growth factors called bone morphogenetic proteins (BMPs), capable of inducing the growth of bone, cartilage or connective tissue. When an osteoprogenitor cell receives a BMP signal, it quickly begins to express the genes to generate collagen, osteonectin and alkaline phosphatase, among other compounds necessary for bone growth. When the bone grows, it ends up wrapping some of the osteoblasts and they lose their ability to replicate, at that time they are dedicated to bone maintenance and not to their synthesis and are called osteocytes.

6 0
2 years ago
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