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Lostsunrise [7]
3 years ago
12

What is the pigment that absorbs ultraviolet light to tan the skin?

Biology
1 answer:
LenKa [72]3 years ago
7 0

Answer:

melanin

Explanation:

melanocytes produce melanin - the pigment which is ultimately responsible for your tan. The pinkish melanin travels up through the epidermis and is absorbed by other skin cells.

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In an experiment, a scientist makes a radioactively labeled probe using human DNA. She then discovers that the probe hybridizes
wariber [46]

Answer: The correct answer is- A.The plant might have a gene that is similar to a human gene.

Probe can be described as the segment of DNA or RNA (generally 100-1000bp in length) that is designed and radioactively labelled to detect the presence of nucleotide sequences, which are complementary to it.

In this question, the probe is synthesised using sample of human DNA but it also hybridizes with the plant DNA.

This indicates that plant genome has certain DNA sequence or gene that is similar to the gene in the human DNA.

Thus, option A) is the right answer.

8 0
3 years ago
Read 2 more answers
Explain how you measure Enzyme activity within the graduated cylinder?​
murzikaleks [220]

Answer:

You measure the oxygen level in the graduated cylinder

Explanation:

For example, after setting up the apparatus, you will then measure the amount of O2 collected in the graduated cylinder after one minute. If the amount of O2 produced after one minute of reaction time is 32 mL, then the enzyme activity is: 32 mL/1 min= 32 mL/min.

5 0
3 years ago
Four friends were arguing about the flow of energy between organisms in a food chain. They
Bezzdna [24]

Answer:

I would agree more with Amos' opinion, thinking that most of the plant's energy ends up in the grasshopper.

Explanation:

In food chains, the flow of energy that occurs from one organism to another, from the producer to the tertiary or quaternary consumer. The amount of energy that can be transferred from one level to another is only 10%, with herbivorous animals taking up more of the energy that a producer has.

According to this, <em>it is logical to think like Amos, since the grasshopper -a primary or herbivorous consumer- will take advantage of more energy contained in the plant, with respect to the consumers of the higher levels</em>.

Learn more:

Energy and nutrients in an ecosystem brainly.com/question/8101088

7 0
3 years ago
Describe the situations in which a normal human cell would enter the cell cycle and undergo mitotic cell division. Explain how s
Ganezh [65]

Answer: An example of a specific case is when a skin lesion occurs. Through mitosis, new skin cells are generated to repair damaged tissue. These cells have to be genetically identical to each other. The spindle fibers are structures formed by microtubules extending from one pole to another to orient the duplicated chromosomes in the spindle, bringing them to the position they occupy during metaphase.

Explanation:

Mitosis is a process of cell division that occurs in eukaryotic cells, i.e. cells that have a nucleus where their genetic material is located. This process generates two identical cells with the same DNA, that is, with two identical nuclei, so it does not provide genetic variability except in case of specific mutations. The objective of mitosis is cell multiplication while preserving genetic information. But in general, in mitosis there is an equal distribution of the cell nucleus as well as the rest of the cell content.

The phases of mitosis are as follows:

  • Interface: The cell duplicates its organelles and its DNA to have twice everything before division.
  • Prophase: The nuclear membrane breaks, the chromosomes condense, the centrosome duplicates and migrates to the opposite poles of the cell forming microtubules. Also, fibers of the mitotic spindle are formed.  
  • Prometaphase: The microtubules invade the space where the genetic material is.
  • Metaphase: The replicated chromosomes line up in the middle of the cell, called the equatorial plane.
  • Anaphase: Microtubules separate chromosomes towards the opposite poles.  
  • Telophase: The nuclear envelope is re-formed from the remaining fragments of the original.
  • Cytokinesis: A cleavage groove is created in the common cytoplasm of the two new cells where the chromosomes were aligned. The cytoplasm is thus strangled until the membrane allows total separation.

<u>Mitosis is then a cellular process that occurs in multicellular organisms to repair damaged tissue, or for growth or development.</u> An example of a specific case is when a skin lesion occurs. When a person suffers an injury, many reactions take place in the repair process to repair the damage including inflammatory, proliferative, and remodeling phases.  <u>Through mitosis, new skin cells are generated to repair damaged tissue. These cells have to be genetically identical to each other, to have the same genetic fingerprint and the same function.</u>

The spindle fibers are structures formed by microtubules extending from one pole to another. The kinetochore microtubules attach to the kinetochore, a structure that forms at the centromere of each duplicated chromosome, <u>and orient the duplicated chromosomes in the spindle, bringing them to the position they occupy during metaphase and attracting the newly separated chromosomes to the poles during anaphase</u>.

5 0
3 years ago
Why do cells tend to have more ADP molecules than ATP molecules
LenKa [72]

The reason why the cells have more ADP than ATP molecules is that the cells have the tendency to use more ATP, rather than restore ADP molecules.

When the body produces energy, in order to be able for it to be released in the body and to be used by the body, the ATP molecules break up. During that break up of the ATP molecule it actually loses one phosphate group, thus becoming an ADP molecule. Since this process is going on constantly, the ATP molecules are constantly breaking up thus resulting in constant new ADP molecules, so they are easily becoming outnumbered.

8 0
3 years ago
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