Because carbon shares electrons, it is an example of a covalent bond. But when the carbon bonds to four additional atoms it becomes known as a double bond.
Lymphocytes generated during an initial infection that circulate in the body for years and quickly destroy that infection if it ever appears again are called the Memory t cells. These cells are a subset of infection that have previously encountered and responded to their respective antigen, thus they may be called the antigen experienced t cells.
Answer:
Hybrid poplar trees can absorb volatile organic compounds through their stomata, thereby filtering them
Explanation:
It is well known that trees play a key role by purifying the air of CO2 and releasing oxygen. Moreover, trees are also capable of absorbing and filtering different types of harmful gases such as ammonia and sulfur dioxide, thereby forestation of larger areas may result an interesting strategy to clean the air from toxic pollutants
The correct option is (A) in biomes at different latitudes.
When climbing a mountain, we can observe transitions in biological communities that are analogous to the changes in biomes at different latitudes.
<h3>
What is biome?</h3>
- A naturally existing species community that is influenced by a region's climate and latitude is referred to as a "biome."
- A place where two biological communities come together and merge is known as an ecotone. It could be small or large, local (the area between a field and a forest), or regional (the transition between forest and grassland ecosystems).
- As you ascend a mountain, different sections experience varying amounts of sunlight and warmth. People see differences in the biological community as an organism ascends a mountain because different latitudes are present.
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The purple spots on the colorless background of corn kernels observed by Barbara McClintock were the result of the transposition of the Ds elements out of the color gene.
<h3>What are the genetic elements found in corn?</h3>
- A transposable element is removed from one spot in the DNA and inserted into a different site in the DNA during the process of genetic transposition, which allows genes to shift their location on chromosomes.
- The first recognized genetic instability was caused by genetic transposition.
- The size of the tissue patch displaying the reversion phenotype increases as a reversion event happens earlier in the kernel development.
- Barbara McClintock saw purple dots on maize kernels with an otherwise colorless background.
- These spots were caused by the Ds components of the color gene being transposed.
- The wild-type (purple) phenotype manifests itself in cells where Ds from the color gene "C" sequence has been lost.
Hence, Barbara McClintock discovered purple patches on the colorless backdrop of maize kernels due to the transposition of the Ds elements out of the color gene.
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