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blsea [12.9K]
3 years ago
7

Which of the following statements about the cytoskeleton is incorrect? A. The dynamic aspect of cytoskeletal function is made po

ssible by the assembly and disassembly of a few simple types of proteins into large aggregates. B. Microfilaments are structurally rigid and resist compression, while microtubules resist tension (stretching). C. Movement of cilia and flagella is the result of motor proteins causing microtubules to move relative to each other D. Transport vesicles among the membranes of the endomembrane system depend on the function of the cytoskeleton.
Biology
1 answer:
Jet001 [13]3 years ago
3 0

All the options given above are correct.

Microfilaments are the thinnest filament of the exoskeleton and they are found in the cytoplasm of eurkaryotic cells. The polymers that made up the microfilament are flexible and strong and they provide support for the cell.

hope this helps you out...good luck!

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Do male or female songbirds build the nest? please show source and evidence to support your answer
hjlf

Actually it is the females the mostly build the nests the males will help build it sometimes both males and females will build it but typically it is females and that goes for all birds.

"Females typically build nests, but sometimes both parents or just the male"

5 0
3 years ago
How can a person prepare his or her body for an adventure to an extreme environment?
Ksivusya [100]
<span>The person can prepare by eating the right food, exercise, hydration of self and condition oneself for the incoming adventure like extreme.  And also the human body systems respond to changes in the external environment, the nervous system and hormones enable us to respond to external changes. </span>
6 0
3 years ago
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a male guinea pig is homozygous dominant for hair texture and hair length. A female guinea pig is heterozygous for hair texture
nekit [7.7K]

If we talk about guinea pigs, the trait of hair length is controlled by a gene with two alleles.

Allele for short hair (S) is dominant on the allele for the long hair (s).

The texture of hair texture  is controlled by a gene with two alleles. It can be rough or smooth, and the allele for rough hair (R) is dominant on allele for smooth hair (r).

Now coming towards the question:

  • A female guinea pig is heterozygous for hair texture and homozygous recessive for hair length.

Phenotype of the female will be Rough and long hair.

  • A male guinea pig is homozygous dominant for hair texture and hair length.

Phenotype of the male will be Rough and short hair.

Hope it help!

4 0
3 years ago
While cleaning out the attic, you find a packet of seeds that your grandmother gathered from her garden. You plant them outside,
Phantasy [73]

Answer:b

Explanation:some seeds do not germinate during adverse conditions.this is called dormancy.this may occur due to hard seed coat.this seed coat prevents the entry of water and oxygen which are necessary for the plant to grow and germinate.

Water is a nessesary medium for essential metabolic reactions in the seed.the temperature at which is seed would germinate also varies.

Oxygen is needed for a germinating plant to obtain energy through respiration. The seed coat may also be so tough that they resist growth and expansion from taking place.

Seeds are able to break dormancy on their own.some may need to undergo natural processes that lead to softening.this process may be slow.some others may need heat or certain nutrients.

Germination of seed occurs when the dormant plant has taken in water and oxygen to show high metabolic activities leading to the formation of a seedling.

7 0
3 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
2 years ago
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