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Negative feedback as a mechanism by which homeostatic control systems operate.
In this example loss of blood results in a drop in blood pressure which could be life threatening if not corrected Effectors such as the heart and blood vessels help ...
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A model of the 70 ribosome, with mRNA and tRNA bound
The 30S subunit is in light blue-green (RNA) and blue (protein), and the 50S subunit is in orange (RNA) and brown (protein).
Two bound tRNAs can be seen.
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Embryonic development of shepherd’s purse (Capsella), a eudicot
After fertilization, a Capsella flower’s ovary develops into a fruit. An embryo surrounded by integuments forms inside each of the ovary’s many ovules.
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The chromosome scaffold of a metaphase chromosome
a A metaphase chromosome b Stripped of chromatin the chromosome scaffold is composed of nonhistone proteins that form an infrastructure that anchors DNA loops and gives the chromosome its shape ...
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