BIOLOGY HIGH SCHOOL

Why is meiosis important for organisms? It allows for genetic variation among organisms. It determines which genes are dominant and which are recessive. It produces genetically identical cells. It provides a means of asexual reproduction.

Answers

Answer 1
Answer:

Answer:

Option A- It allows for genetic variation among organisms.
Answer 2
Answer:

Meiosis is important for organisms since it allows for genetic variation among organisms.

Further Explanation:

Mitosis and meiosis are two different types of cell division. Mitosis produces two daughter cells which are identical to each other. While in meiosis “four haploid” daughter cells are produced. It is a highly systematized cell division process as the spore or gamete produce must comprise one member of each homologous pair of the chromosomes. The crossing over results in genetic exchange between the non-sister chromatids of “homologous chromosomes”. Meiosis plays a significant role during the alternation of generation in plants and acts as a bridge between the sporophyte stage and gametophyte stage. During meiosis cell division, haploid gametes or spores are produced whereas mitosis produces daughter cells which are genetically similar to each other. During meiosis the pairing of homologous chromosomes occurs by synapsis which separate during anaphase.

Learn More:

  1. Learn more about meiosis brainly.com/question/1600165
  2. Learn more about the process of molecular diffusion in a cell brainly.com/question/1600165
  3. Learn more about human sperm and egg cell brainly.com/question/1626319

Answer Details:

Grade: High School

Subject: Biology

Chapter: Mitosis and Meiosis

Keywords:

Mitosis, meiosis, homologous pair, haploid, gametes, spores, four, synapsis, gametes, daughter cell, plant, cell division, crossing over.

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Telomerase Indicate whether each of the following statements about telomerase is true or false. 1. With each cell division, chromosomes gradually shorten in the absence of telomerase activity. TrueFalse 2. During embryonic and childhood development in humans, telomerase activity is relatively low compared to the level of activity in most somatic cells of an adult. TrueFalse 3. Cells that divide frequently tend to have relatively low levels of telomerase. TrueFalse 4. The activity of telomerase in most mature somatic cells is kept high by increasing the expression of the gene encoding this enzyme. TrueFalse 5. Mice with low telomerase activity appear to be normal for up to six generations, but they show steadily decreasing telomere length that eventually leads to nonviable offspring. TrueFalse 6. When telomerase is added to cells grown in culture, their lifespan decreases relative to controls that have no telomerase added. TrueFalse 7. Cancer cells generally have high levels of telomerase activity, which allows them to divide indefinitely without the chromosomes getting shorter and shorter. TrueFalse

Answers

Here are the answer for each item.
1. With each cell division, chromosomes gradually shorten in the absence of telomerase activity (FALSE)2. During embryonic and childhood development in humans, telomerase activity is relatively low compared to the level of activity in most somatic cells of an adult. (FALSE)
3. Cells that divide frequently tend to have relatively low levels of telomerase.(FALSE).
4. The activity of telomerase in most mature somatic cells is kept high by increasing the expression of the gene encoding this enzyme. (FALSE)
5. Mice with low telomerase activity appear to be normal for up to six generations, but they show steadily decreasing telomere length that eventually leads to nonviable offspring. (FALSE)
6. When telomerase is added to cells grown in culture, their lifespan decreases relative to controls that have no telomerase added. (FALSE)
7. Cancer cells generally have high levels of telomerase activity, which allows them to divide indefinitely without the chromosomes getting shorter and shorter. (TRUE).

What are nucleic acids

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Answer: It is the overall name of DNA and RNA. They have Nucleotides.

Which one of the following reactions occurs in the cristae of the mitochondria? A. The citric acid cycle B. The electron transport chain C. The prep reaction

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Answer: B - The electron transport chain

The electron transport chain is a part of the cristae of the mitochondria and is vital for cellular respiration. The citric acid cycle takes place in the inner membrane of the mitochondria. The prep reaction does not occur in the mitochondria, it occurs in the cytoplasm of a living cell.

clonal selection of lymphocytes leads to the development of which type of cells? a. effector cells and b cells b. t cells and memory cells c. effector cells and memory cells

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b. t cells and memory cells

These immune cells produce a proper response chemical to combat the microbes. The initial exposure of the body to an infectious agent e.g. through a vaccine, triggers an immune response most of which rapidly diminishes after the vaccination.  However some cells of the immune system called lymphocytes remain with a memory of that pathogen.As a result, if the same pathogen infects a vaccinated person, the memory cells remember and recognize it . 

DNA samples can be separated according to size using the technique of(1) chromatography (3) replication
(2) electrophoresis (4) dissection

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Answer:

Option 2

Explanation:

Electrophoresis or in general known as "Gel electrophoresis" is a process by which separates and arranges DNA as per their size. In this process, DNA samples are placed at one end and at the other end electric current is applied. As we know that DNA fragments carry negative charge on them, hence they move towards the positively charged electrode. Also, all the DNA fragments have the same charge on it, therefore the larger the DNA fragment the more negatively charged the DNA is and hence the more rapidly it moves towards the positive electrode.  

At the end of the electrophoresis, same-sized DNA fragments arrange themselves in a row.  

Hence, option 2 is correct
(2) Electrophoresis.

Chromatography is the separation of colors/inks.
Replication replicates DNA.
Dissection can't really be done on DNA.
Electrophoresis is a process using gel that separates DNA by size.

The cochlea, Hair cells, Ossicles, The pinna can be damaged by loud noises.

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The Cochlea because it is the spiral cavity of the inner ear containing the organ of Corti, which produces nerve impulses in result to sound vibration.

Answer:

The cochlea

Explanation:
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