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2 years ago

Which structures protect the cell? Check all that apply.

Biology

2 answers:

Drupady [299]2 years ago

8 0

Answer:

Option 1, cell wall

Explanation:

Cell wall is an outer covering of the cell that is responsible for giving shape and support to the cell. A cell wall is both tough and flexible at the same time in order to protect the cell wall from various losses. It also regulates the transmission of material in and out of the cell through a semipermeable membrane.

A cell wall in plant shape is made up of cellulose, hemi-cellulose and pectin which provide strength and rigidity to the cell.

hence, option 1 is correct

konstantin123 [22]2 years ago

8 0

Answer: Cell wall and cell membrane

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How can reproductive isolation lead to speciation?

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2 years ago

Why is the ability of the cell membrane to be "picky" important?

Yuliya22 [10]

Answer:

Hi there!

Your answer is:

It is very important for the cell membrane to be semi-permeable because the ability to pick and choose what comes in and out of the cell keeps the cell safe! The membrane can choose to block out nasty germs and can also choose to get rid of internal waste.

An example of when this is important is in this scenario:

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3 years ago

Boris Magasanik collected data on the proportion of each base in RNA from different species. To compare the relative amount of e

just olya [345]

Answer:

The nucleic acid is a macromolecule present in living systems in the form of either DNA or RNA, whose molecule consists of many nucleotides which are linked with each other to form long chains. The presence of DNA or RNA in an individual promotes continuity of life. The variability and complexity of nucleic acid are dependent on its constituent molecules as, sugar, a phosphate group, and a nitrogenous base. However, two monocyclic nitrogenous bases were classified purines (adenine:A, guanine:G) and pyrimidines (thymine:T, cytosine:C, and uracil:U).

In addition, RNA is a single-stranded structure which differs from DNA in two aspects, the sugar content of RNA is ribose, and pyrimidine base uracil replaces the thymine base of DNA. A ratio between two strands of DNA can be calculated by using Chargrff's rule which states that "DNA from any cell of all organisms possess a 1:1 ratio (base Pair Rule) of pyrimidine and purine bases'.

The purine to pyrimidine ratio in RNA with different bases is given below in the following table:

Presence of single strand in RNA does not follow chargaff's rule and alters the purine: pyrimidine ratio. The above ratio of each base in the given information is not equal, due to which the ratio of purines to pyrimidines is different. The ratio of DNA and RNA is not equal because DNA has its complementary DNA strand. However, bases in RNA might vary due to its single-strandedness property, but its ratio is dependent on the species.

Therefore, it can be concluded that the ratio of purines to pyrimidines is dependent on the species due to its genetic makeup. Hence, option (c) is correct.

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2 years ago