Nitrogen Fixation: Root and Bacteria Interactions. Nitrogen is an important macronutrient because it is part of nucleic acids and proteins. ... The most important source of BNF is the symbiotic interaction between soil bacteria and legume plants, including many crops important to humans.
The Y chromosome likely contains 70 to 200 genes that provide instructions for making proteins. Because only males have the Y chromosome, the genes on this chromosome tend to be involved in male sex determination and development.
<h3>What is a chromosome?</h3>
A chromosome is a lengthy DNA molecule that contains all or a portion of an organism's genetic code. Histones, which serve as packing proteins for the majority of eukaryotic chromosomes, work with chaperone proteins to attach to and condense the DNA molecule in order to preserve the integrity of the molecule. These chromosomes exhibit a complicated three-dimensional structure that is crucial for controlling transcription.
Under a light microscope, chromosomes are typically only discernible during the metaphase of cell division (where all chromosomes are aligned in the center of the cell in their condensed form).
Prior to this, each chromosome undergoes a process known as chromosome duplication (S phase), during which a centromere connects both copies, forming either the X-shaped structure (if the centromere is situated equatorially) or a two-arm structure (if it is situated distally) depending on where it is situated.
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Answer:
Yes, <em>the random alignment of the tetrads along with the equatorial plate occurs during metaphase I.</em>
Explanation:
After the crossing-over in prophase I, and during metaphase I, fibers of the <em>spindle apparatus</em> capture chromosomes and <em>take them toward the center of the cell, to the </em><u><em>metaphase plate.</em></u><em> </em>The homologous pairs of chromosomes get aligned in the metaphase plate for their posterior separation in <u>anaphase I.</u>
<em>Each chromosome of the pair joins with a microtubule of only one of the spindle poles</em>, so the two equivalent chromosomes join the fibers of opposites poles.
When they align in the center of the cell, their orientation is random.
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Answer:
In the given question, the crucial rivets represent keystone species.
Explanation:
An ecosystem comprises some of the species, which are essential to the survival of the other species in the system, these species are known as the keystone species. The keystone species can be an unassuming plant or a huge predator, and in the absence of a keystone species, the ecosystem may not thrive.
In an ecosystem, the keystone is regarded as one of the most essential parts. A keystone species refers to an organism, which helps in sustaining the system together. Some of the ecosystems may lose their tendency to amend with the changes in the environment if their keystone species get vanished.
There are three kinds of keystone species considered by various scientists. These are ecosystem engineers, predators, and mutualists.