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zmey [24]
4 years ago
12

A geneticist introduces a transgene into yeast cells and isolates five independent cell lines in which the transgene has integra

ted into the yeast genome. in four of the lines, the transgene is expressed strongly, but in the fifth there is no expression at all. which is a likely explanation for the lack of transgene expression in the fifth cell line?
Biology
2 answers:
nata0808 [166]4 years ago
7 0
I think the best explanation would be that the transgene integrated into a heterochromatic region of the genome. Heterochromatin are chromosomal regions of the genome that lack high numbers of genes while chromosomal regions contain high concentrations of transcribed genes and make part of the relaxed euchromatin. A transgene is a genetic material that has been transferred naturally, or by any of a number of genetic engineering techniques from one organism to another.
Tanzania [10]4 years ago
6 0

There are so many examples for that in different areas, like biology experiment carried out in our lab recently.

one link: https://www.creative-biogene.com/support/Antibody-Producing-Cell-Lines-Development.html


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Sunlight is essential for the varied life on earth. sunlight provides energy to photosynthetic organisms by providing __________
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Energy which in turn produces the sugar the plant needs to go through photosynthesis
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4 years ago
Water is drawn upward from the roots through plant tissue to the leaves by ________.
Assoli18 [71]

Answer: a. capillary action.

Water is a taken up by the plants from the roots, which needs to be transferred to all the parts of the plants to conduct cellular metabolic processes like photosynthesis and respiration. The properties of water molecules are responsible for conduction of water from the root to the stem and other higher parts. The cohesion is the property of water which water molecules are combined with each other due to sharing of bonds at the atomic level. The adhesion is the property of water which allows water molecules to attach with other substances or substrate.  Adhesion will cause the attachment of water molecules to the wall of the vessel (xylem) of the plant. Capillary action occurs when the adhesive force is greater than the cohesive force between water molecules. The supply will be upward and force of gravity will also be applicable on this. Capillary action mimics the transfer of water from a tube or pipe. In this way water is drawn upward from the roots through plant tissues to the leaves by capillary action.  


4 0
3 years ago
Read 2 more answers
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The nurse response in related to the patient's query about feeling nauseated at the sight of meat is that this condition will go away in three months. Nausea and vomiting are included in early symptoms of pregnancy and in pregnancy the HCG (human chronic gonadotropin) levels are increased and due to this many women feel nauseated. It is normal in the first trimester and it will go away in the further pregnancy.

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4 years ago
Bioflix activity: membrane transport -- vocabulary review can you match the processes involved in membrane transport to their de
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Explanation:

<u></u>

<u>From the diagram with corresponding labels:</u>

  1. Exocytosis
  2. Facilitated diffusion
  3. Endocytosis
  4. Diffusion
  5. Active transport

<u>Further explanation:</u>

Via diffusion, small water molecules can move across the phospholipid bilayer acts as a semi-permeable membrane into the extracellular fluid or the cytoplasm which are both hydrophilic and contain large concentrations of polar water molecules or other water-soluble compounds.

Via osmosis, the water passes through the membrane due to the difference in osmotic pressure on either side of the phospholipid by layer this means that the water moves from regions of high osmotic pressure/concentration to regions of low pressure/ concentration to a steady state.

Active transport is a mediated process that requires the use of specialized membrane proteins these proteins require energy in the form of avenues and triphosphate or ATP in order to facilitate necessary conformational changes to the large protein molecules.

Carrier proteins and channel proteins are the two major classes of membrane transport proteins; these allow large molecules called solutes (including essential biomolecules) to cross the membrane. Channel proteins which are pores filled with water versus enabling charged molecules to diffuse across the membrane,  from regions of high concentration to regions of lower concentration. This is a passive part of facilitated diffusion

<em>...some very large molecules require specialized type of active transport in order to move across the membrane this includes endocytosis and exocytosis</em>

<em> </em>

During endocytosis large molecules cells and cell fragments moved across the plasma membrane through a process of invagination; piece of the external cell membrane falls into itself and forms a small pocket that surrounds the target molecule this breaks off from the membrane to form an intracellular vesicle; different methods of endocytosis such as Phagocytosis, Pinocytosis and receptor-mediated endocytosis, take in cells,  water and targeted substances respectively.

Similarly, in exocytosis, the particles (Protein, Waste material etc.) surrounded by a phospholipid membrane. However, this membrane is formed in the cytoplasm, and attaches to the plasma membrane’s interior in a process opposite to endocytosis;  material is removed from the cell and exported into the cell’s exterior called the extracellular space.

Learn more about membrane components at brainly.com/question/1971706

Learn more about plasma membrane transport at brainly.com/question/11410881

#LearnWithBrainly

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artcher [175]

Answer:no me se la respuetas

Explanation:

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