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dem82 [27]
3 years ago
5

Simple, prokaryotic organisms have been on Earth for over 3 billion years and have been able to grow and evolve into many differ

ent and successful prokaryotic organisms. Which structure evolved in cells approximately one billion years ago that allowed for the forming of more complex, multicellular organisms?
A) nucleus

B) ribosome

C) plasma membrane

D) golgi apparatus
Biology
2 answers:
mrs_skeptik [129]3 years ago
6 0

A) The nucleus is the answer

astraxan [27]3 years ago
6 0

Answer:

The correct answer is option A: the nucleus, a fundamental part of the eukaryotic cell.

Explanation:

Hello!

Let's solve this!

First we will analyze what each of the structures is.

A) nucleus: main structure of a eukaryotic cell. The nucleus contains the DNA inside.

B) Ribosome: they play a fundamental role in protein synthesis.

C) plasma membrane: it is the membrane that surrounds the cell. It is semipermeable, it means that it lets in some substances that are good for the cell and does not let harmful substances pass.

D) Golgi apparatus: helps the synthesis of lipids.

After the analysis, we conclude that the correct answer is option A: the nucleus, a fundamental part of the eukaryotic cell.

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Answer:

Algae

Explanation:

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11. Which of the following is NOT true? • ATP is formed during both photosynthesis and cellular respiration • Both plant cells a
Lina20 [59]
The third one is incorrect.
A plant releases oxygen during photosynthesis not carbon dioxide.
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6 0
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Lesechka [4]
D because to help preserve environment everyone has to work together
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3 years ago
The blood Group of Mother is O. The Blood Group of the Child is B. Man Exonerated If He to Blood Group?​
aalyn [17]

Answer:

If the mother's blood type is O, and the child's blood type is B, a man would be exonerated from paternity if he has blood type A or O.

Explanation:

In the above case, if a mother has blood type O and her child has blood type B, a man can be exonerated from paternity only if his blood type is A or O, and responsible if he is type B or AB.

The blood type is defined by the presence of surface antigens in the red blood cell, called A and B. The presence of each antigen is determined by a gene present on the parental chromosomes.

  • <em> </em><u><em>Blood type A</em></u><em> corresponds to the presence of gene A, and its genotypic expression can be A/A or A/O. </em>
  • <u><em>Type B blood</em></u><em>, whose genotype is B/B or B/O, is due to the presence of a gene containing the B antigen. </em>
  • <u><em>AB blood</em></u><em> —due to codominance— has one gene for A and another for B, with genotype A/B. </em>
  • <em>Blood type O, characterised by the absence of surface antigens, behaves like a recessive trait, which only manifests itself in the absence of surface antigens A and B. The genotype is O/O. </em>

By making a hypothetical crossing between mother and man, one can observe why he can be exonerated.

<u>Man with blood type O </u>

♂ O|O

♀ O|O

Alleles     O      O

O           O|O   O|O

O           O|O   O|O

The only possibility, in this case, is to have children with type O blood. No chance of children B.

<u>Male with blood type A </u>

♂ A|O

♀ O|O

Alleles     A        O

O            A|O    O|O

O            A|O    O|O

In this case there is a 50% chance that the children will be blood type A and 50% chance that they will be O. No chance of children B.

In the case of a man A|A the result is 100% probability of children A|O, and no probability of children B.

<em>So, a </em><em>man with blood types A (any genotype) and O, can be exonerated from paternity</em><em>, since it is </em><em>impossible for him to have a child of blood type B, when the mother is of blood type O</em>.

4 0
2 years ago
Name some of the traits mendel studied with his pea plants.
Scorpion4ik [409]
Gregor Mendel was an important scientist, considered to be the founder of the science of genetics. His experiments on the crossbreeding of plants and the passing down of favourable traits, led him to establish the laws of Mendelian inheritance. He was using pea plants for his experiments and he was studying seven different pea traits: pea shape and color, pod shape and color, flower color, plant size and position of flowers.

7 0
3 years ago
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