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nekit [7.7K]
3 years ago
12

Which of the following cannot exist in RNA?

Biology
2 answers:
gladu [14]3 years ago
4 0
Your answer would be A. Uracil
patriot [66]3 years ago
3 0
The answer is b.thymine
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Ordinary cell division produces two daughter cells that are genetically identical. This type of cell division is important for a
Ratling [72]

Answer:

C) production of sperm and eggs

Explanation:

Sperms and eggs are the male and female gametes respectively. Formation of sperms and egg cells require meiotic cell division. Meiosis in sperm mother cells and egg mother cells reduces the chromosome number of half in the sperms and eggs. Meiosis also adds new gene combinations in these gametes by the process of crossing over.  

Mitosis cannot reduce the chromosome number to half in the sperms and eggs. Absence of crossing over in mitosis leads to the formation of genetically identical progeny cells from mitosis.  

Hence, mitosis can not form sperms and egg cells.  If it does, the sperms and egg cells would not have genetic variations and there would be doubling of chromosome number with each round of sexual reproduction.

8 0
3 years ago
What is a comparative study of the similarities and differences in the embryos of different species?
kolezko [41]

Answer:

first the ways of adaptation and behaviour of plant

3 0
3 years ago
What errors exist in the table below?
Vera_Pavlovna [14]

Answer:

A. spiral galaxies are not pinwheel-shaped

Explanation:

There are three types of galaxies that include spiral galaxy, elliptical galaxy and irregular galaxy.

Elliptical galaxies are round shaped as well as elongated. Elliptical galaxies have both old and new stars but mostly it contains old stars.

Spiral galaxies are pinwheel-shaped due to the regular spinning motion of dust, stars and gas around the galactic center, at speeds of hundreds of kilometers per second which allows the matter to take a  pinwheel-shape. Spiral galaxies are made up of lot of gas and dust and forms many new stars which allows the spiral galaxy to shine bright.

Irregular galaxies do not have any definite shape because of the gravitational influence of close galaxies. They also have many new stars.

Hence, the error is foudn in first sentence, where it says that spiral galaxies are not pinwheel shaped. so teh correct option is A.

7 0
3 years ago
In an aquatic ecosystem, the aquatic plants are eaten by small invertebrates that in turn are eaten by crayfish, the crayfish ar
VladimirAG [237]
The fish are eaten by ducks. Ducks cannot really swallow preys that are too big for their throats. They usually swallow organisms that are a lot smaller than fishes. because they do not have the capacity to bite and chew their preys. 
6 0
3 years ago
Cells with two of each kind of chromosome are described by the term
frosja888 [35]
They are called Diploid cells
4 0
2 years ago
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