1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Flura [38]
4 years ago
11

Why do mitochondria and chloroplasts have relatively small genomes?

Biology
1 answer:
Komok [63]4 years ago
6 0

Answer:

B) Over time, much of their nucleic acid has migrated to the host cell nucleus

Explanation:

The origin of chloroplasts and mitochondria is explained via endosymbiosis theory: they  originated as prokarytoic symbionts. The host cell acquired genetic information from them and “took it up” by lateral gene transfer. Those genes (now located in the eukaryotic cell nucleus-nuclear genome) encode the great majority of chloroplast and mitochondrial proteins, as well as many proteins of the nucleus and cytosol.  

Yet ,chloroplasts and mitochondria retained some of the genes in their genomes.

You might be interested in
Which of the following describes the function of flagellum?
RideAnS [48]
The answer is A . it is used for movement and mobility is the ability to move freely around so that’s an explanation if u wanted it.
5 0
4 years ago
What is the impact of developing and using rock, mineral, and energy resources on earth's living and non living systems
77julia77 [94]

Answer:  The use of rock, mining and energy production contaminates the environment by affecting the abiotic land mass. And therefore, by contaminating the habitat, the living beings that live there are harmed.

Explanation:

<u>Mineral and rock extraction, transport and processing comprise actions that produce environmental impacts because it produces a certain disturbance to the surface and underlying strata, as well as to aquifers</u>. These impacts can be short-lived, lasting as long as the mine is operational, or they can persist after mine development has been completed.

Major impacts include:

  • Contamination of soil, vegetation, drainages, rivers and groundwater aquifers contamination from leaking tailing piles and slurry ponds. If not properly treated, effluent from surface or subway mine water disposal can be highly acidic, and will contaminate surface waters and shallow groundwater with heavy metals, nitrates or oil from equipment, reducing local water supplies. During surface mining, movement and stockpiling of overburden, constructions or covering of soils alter rivers, drainages and coastal areas.
  • Surface disturbance caused by access roads, pits, and site preparation.
  • Noise and emissions from the operation of equipment.
  • Air pollution, atmospheric dust from traffic, excavation, drilling and site clearing. Atmospheric particulates come from blasting, excavation and earth moving, transportation or any operations that occur on the surface of subway mines.
  • Removal of rock strata can disrupt the continuity of the local aquifer, and cause interconnections and contamination between groundwater.

<u>Both surface and subway mining include a drainage of the mine area and discharge of mine water, the removal and storage/disposal of large volumes of waste and the transfer and processing of minerals or construction materials.</u> This requires the use of diesel or electric mining and haulage equipment. Transportation of ore within the mine area and to processing facilities may use trucks, conveyors, rail, polyduct or conveyor belt which are vehicles that emit large amounts of carbon dioxide.

Processing plants may be located in mountainous regions and so may have difficulty disposing of production wastes and other pollutants. <u>They may then end up disposing of them in rivers or coastal waters.</u>

The land at the surface of the mines will be unstable, there will be fracturing and subsidence, it will modificate soils, vegetation, rivers, wildlife habitat, wetlands, causing a temporary or permanent loss of land productivity, and <u>contamination of soils due to mineral materials and toxic substances</u>.

<u>Also, the production and use of energy is the main cause, together with transportation, of greenhouse gas emissions, the gases responsible for climate change</u>. Consequences of climate change are increased temperatures, rising sea levels and reduced rainfall.

The current model of generation, transport and consumption, <u>absolutely dependent on fossil fuels, is unsustainable</u>. The chemical products emitted, mainly from coal and oil-derived thermal power plants, are transported by the wind and deposited by rainfall thousands of kilometers away from their origin, causing "acid rain", which is <u>the cause of the deterioration and destruction of forests, lakes and other ecosystems</u>. Another example are the N<u>uclear power plants which produce high-level radioactive wast</u>e (long-lived, highly radioactive), which poses a constant threat to the environment due to the current inability to manage it.

Thus, the use of rock, mining and energy production contaminates the environment by affecting the abiotic land mass. And therefore, by contaminating the habitat, the living beings that live there are harmed.

6 0
3 years ago
Where does photosynthesis occur in the plant cell?
Step2247 [10]

Explanation:

Photosynthesis occurs in the chloroplasts in the plant cells.

4 0
3 years ago
Read 2 more answers
A.
zvonat [6]
<h2>Answer:</h2><h2>TIS B FOR EDG</h2>

Explanation:

7 0
3 years ago
What is one effect that burning fossil fuels has on the atmosphere?
stealth61 [152]

Answer:

increases levels of greenhouse gases

Explanation:

7 0
4 years ago
Read 2 more answers
Other questions:
  • Why can’t humans digest all carbohydrates?
    10·2 answers
  • The skeletal System of animals provide structure and support. Which cell part provides a similar function in a plant a) Golgi ap
    5·2 answers
  • Suppose a certain type of bacteria reproduces according to the model p(t)=100e^0.271t, where t is time in hours. at what rate do
    10·1 answer
  • Together, sewage treatment and drinking water treatment are used to _____.
    15·2 answers
  • How is my health influenced by ecosystem services?
    12·1 answer
  • What are the answers to these ?
    11·2 answers
  • The highest level of organization is the ______.<br><br> tissue<br> cell<br> system<br> organ
    6·1 answer
  • How much time does a cell spend in cytokinesis
    7·2 answers
  • What does this experiment indicate about enzyme specificity?
    11·1 answer
  • Ventricles of the brain are cavities that are derived from the lumen of the embryonic ______.
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!