For a certain characteristic, a homozygous dominant individual is crossed with a homozygous recessive individual.

What is the primary role of the respiratory system in living organisms?

Sav [38]

B to obtain oxygen
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4 0

4 years ago

Compare embryonic and adult stem cells in animals

dimulka [17.4K]

Embryonic stem cells derived from blastocysts are pluripotent (able to differentiate into many cell types). Adult stem cells, which were traditionally thought to be monopotent multipotent, or tissue restricted, have recently also been shown to have pluripotent properties.

7 0

3 years ago

Platyhelminthes exhibit cephalization. Which tissue is affected during this process?

Sonja [21]

The tissue that is affected during the process in which Platyhelminthes exhibit cephalization is the nervous system. Cephalization is actually a process in which the nervous tissues get clustered towards the end of an organism. I hope that this answer has actually come to your help.

6 0

3 years ago

How is carbon cycled between the hydrosphere and the biosphere?

Alina [70]

The carbon cycle is the biogeochemical cycle by which carbon is exchanged between the biosphere, geosphere, hydrosphere, and atmosphere of the Earth. ... The ocean contains the largest active pool of carbon near the surface of the Earth, but the deep ocean part of this pool does not rapidly exchange with the atmosphere

7 0

4 years ago

Learning Task 2 Write the word true or false if the statement is correct and if false change the underline word or words to make

EastWind [94]

Complete question:

Write the word TRUE if the statement is correct and if FALSE change the underlined word or words to make the statement correct.

_______1. A molecular group consisting of a sugar molecule, a phosphate group and a nitrogenous base is a nucleic acid.

_______ 2. In a DNA molecule, a base pair would be composed of adenine and guanine.

_______ 3. Cytosine and adenine are purines.

_______ 4. During the replication of DNA, bonds are broken between the phosphate groups.

_______ 5. RNA contains the nitrogenous base uracil.

_______ 6. There are 20 different amino acids in a cell.

_______ 7. The coded message carried by messenger RNA is translated into polypeptides at organelles called chloroplasts.

_______ 8. The decoding of a messenger RNA message into a polypeptide chain is known as translation

_______ 9. A severe mutation may lead to cell death and may have no effect on the body.

_______ 10. Most mutation are harmful.

Answer:

False
False
False
False
True
True
False
True
True
False

Explanation:

_False_1. A molecular group consisting of a sugar molecule, a phosphate group, and a nitrogenous base is a nucleic acid.

Nucleotides: subunits or monomers composed of a sugar molecule, joined with a phosphate group and a nitrogenated base. The chain or sequence of nucleotides composes the polymer. Different nucleotides joined by their extremes compose the nucleic acid: DNA or RNA.

A molecular group consisting of a sugar molecule, a phosphate group, and a nitrogenous base is a nucleotide.

_False_ 2. In a DNA molecule, a base pair would be composed of adenine and guanine.

In the DNA molecule, Adenine (Purine) always pairs with Timine (Pyrimidine), while Guanine (Purin) pairs with Cytosine. A-T pair is united by 2 hydrogen bonds, and the G-C pair is united by 3 hydrogen bonds.

In a DNA molecule, a base pair would be composed of adenine and timine, or In a DNA molecule, a base pair would be composed of cytosine and guanine.

_False_ 3. Cytosine and adenine are purines.

Nitrogenated bases that form nucleic acids correspond to purines and pyrimidines. Adenine and guanine derive from purines, while Thymine and Citocine derive from Pyrimidines.

Guanine and adenine are purines.

_False_ 4. During the replication of DNA, bonds are broken between the phosphate groups.

During the replication of DNA, bonds are broken between the hydrogen groups.

_True_ 5. RNA contains the nitrogenous base uracil.

Instead of Timine, RNA contains uracil that pairs with adenine.

_True_ 6. There are 20 different amino acids in a cell.

_False_ 7. The coded message carried by messenger RNA is translated into polypeptides at organelles called chloroplasts.

When mRNA leaves the nucleus, meets a free ribosome in the cytosol. Into this organelle, it starts the protein building. Ribosomes read the mRNA code and begin protein synthesis by adding the correct amino acid using transference RNA.

The coded message carried by messenger RNA is translated into polypeptides at organelles called ribosomes.

__True__ 8. The decoding of a messenger RNA message into a polypeptide chain is known as translation

__True__ 9. A severe mutation may lead to cell death and may have no effect on the body.

_False_ 10. Most mutation are harmful.

A mutation is a change or alteration in DNI sequences that introduce new variants. Many of these are eliminated, but most of them might succeed and be incorporated into each individual. These mutations are the ones that have been selected by natural selection, leading to evolution.

Most mutation are not harmful

5 0

3 years ago