100 Points And Brainly If you answer correctly with detail.

Biology

1 answer:

Deffense [45]2 years ago

4 0

Answer:

I would first put jaws at number one because most of the other options are for mammals while some marine life has jaws too.

You might be interested in

Which statement about membranes is TRUE? Most plasma membranes contain more than 70% proteins sterol lipids are common in human

gulaghasi [49]

Answer:

Sterol lipids are common in human cell plasma membranes

Explanation:

Human plasma cell membrane contains sterol lipids and proteins which serves as structural maintainers of the cell.

6 0

3 years ago

Which cell structure is made of a bilayer of phospholipids and<br> encloses all cells?

wlad13 [49]

Answer:

The cell structure is the plasma membrane also known as the cell membrane.

Explanation:

The plasma membrane is the thin coat of lipids (phospholipids) that surrounds and encloses a cell, also can be called the cell membrane

4 0

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.