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3 years ago

The endo-symbiotic theory states that ; one piece of evidence supporting this theory is the fact that .

Biology

1 answer:

Hatshy [7]3 years ago

7 0

Answer:

The correct answer is B.

Explanation:

The answer is partly in the name of the theory. The Endosymbiotic Theory, endo meaning "to absorb" or "to contain" and symbiotic meaning "a mutually relationship between two bodies in which both mutully benefit from" or "close physical interaction between two organisms".

The theory suggests that at some point in time, a prokaryotic cell was consumed by another cell which eventually led to the development of organelles such as mitochondria and chloroplast. The strongest evidence for this statement is the fact that these organelles have their own DNA, which can be an indication to the fact that once they were seperate organisms.

I hope this answer helps.

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For the numbered steps below, select the option that places them in the correct order. 1) The ribosome binds to the mRNA and use

MrRissso [65]

Answer:

first 4, then 2, then 1, and lastly 3

Explanation:

First, RNA polymerase binds to the promoter region of a gene on the DNA and initiates transcription. Transcription is the process by which we get mRNA (coding RNA) which is used as a template for protein synthesis. Then, in transcription, the resulting mRNA undergoes modification and maturation. This involves removal of introns, addition of 3'-poly-A tail and 5'-cap. Introns are sequences that do not code for protein and are hence removed. The structure that removes introns is the spliceosome. Thirdly, mature mRNA travels to the cytoplasm. Ribosome (composed of rRNA) binds to mRNA and tRNA to start the process of protein synthesis. The process of formation of protein is called translation. Lastly, the primary structure of protein may undergo folding to form a tertiary structure.

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3 years ago

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kiruha [24]

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3 years ago

What body part contains epithelial tissue, in your answer, explain how cell arrangement helps this body part perform its functio

snow_tiger [21]

Answer:

explain how cell arrangement helps this body part perform its function. :

Its tightly packed cells allow for protection against harmful substances.

Explanation:

Epithelial tissue covers the outside of the body and lines organs, vessels (blood and lymph), and cavities. Epithelial cells form the thin layer of cells known as the endothelium, which is contiguous with the inner tissue lining of organs such as the brain, lungs, skin, and heart. The free surface of epithelial tissue is usually exposed to fluid or the air, while the bottom surface is attached to a basement membrane.

The cells in epithelial tissue are very closely packed together and joined with little space between them. With its tightly packed structure, we would expect epithelial tissue to serve some type of barrier and protective function and that is certainly the case. For example, the skin is composed of a layer of epithelial tissue (epidermis) that is supported by a layer of connective tissue. It protects the internal structures of the body from damage and dehydration.

Epithelial tissue also helps to protect against microorganisms. The skin is the body's first line of defense against bacteria, viruses, and other microbes.

Epithelial tissue functions to absorb, secrete, and excrete substances. In the intestines, this tissue absorbs nutrients during digestion. Epithelial tissue in glands secrete hormones, enzymes, and other substances. Epithelial tissue in the kidneys excrete wastes, and in the sweat glands excrete perspiration.

Epithelial tissue also has a sensory function as it contains sensory nerves in areas such as the skin, tongue, nose, and ears.

Ciliated epithelial tissue can be found in areas such as the female reproductive tract and the respiratory tract. Cilia are hair-like protrusions that help propel substances, such as dust particles or female gametes, in the proper direction.

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3 years ago

Read 2 more answers

7. Population growth is limited by density-dependent factors such as

Leni [432]

Answer: D.)Biotic and Abiotic factors

Explanation: The living things in an ecosystem are called biotic factors. Living things include plants, animals, bacteria, fungi and more. The non living parts of an ecosystem are called abiotic factors. In an ecosystem some abiotic factors are sunlight, temperature atmospheric gases water and soil. These would not limit pop growth as much as predation and disease.

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3 years ago

I need helo with one please help and if you can do number 2 that would be good please help

masya89 [10]

Answer:

✔Deep sea trenches

✔Mountains

✔Faults

B. It is an ancient supercontinent

Explanation:

The above answers are correct.

The convergent plate boundary is known to be an area on Earth where subduction occurs. It is a place where two or more lithospheric plates collide. This convergent plate boundary is characterized by deep ocean trenches, island arcs, mountain ranges, faults and volcanoes.

Pangaea is known to be a supercontinent that actually incorporated almost all the earth's landmasses and it is said to have existed during the late Paleozoic and early Mesozoic eras. It is revealed that over 150 million years the supercontinent began to break apart.

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3 years ago

The endo-symbiotic theory states that __________; one piece of evidence supporting this theory is the fact that __________.

The endo-symbiotic theory states that ; one piece of evidence supporting this theory is the fact that .