Answer:
Electronic thermometers.
Explanation:
It's useful these days for testing people who are entering buildings to make sure they don't have corona virus. Among many other uses such as testing for fever all the way to testing if food is cooked all the way through.
B. Histones is the correct answer.
The answer would be Igneous rocks, because of magma cooling
An insulin receptor (i.e. the receptor which insulin binds to) is a cell-surface receptor (i.e. the receptor is embedded in the cell-surface membrane).
Thus, the second, third, and fourth options are incorrect, as insulin does not bind to receptors on the cell's nucleus, nor in the cytoplasm, nor the DNA directly.
Option one is correct, as the signal is a multistep process, where insulin has to first activate the molecules on the insulin receptor, which will then activate other molecules, and transfer the signal down a signalling pathway.
Hope this helps! :)