Which of the following organelles acts as the cell's powerplant?
nuclei
lysosomes
vacuoles
mitochondria

Option D. Mitochondria

Explanation:

Mitochondria is an organelles that act as the power plants of the cell.

Mitochondria is surrounded by two membranes, and have their own genome. The outer of membrane of mitochondria surrounds inner membrane completely with small intermembrane space in between.

The inner membrane contains proteins which participates in electron transport and ATP synthesis. the inner membrane surrounds the mitochondrial matrix and during the citric acid cycle, it produces electrons which further travel from one protein complex to other protein in the inner membrane. As the result of this electron transport chain, oxygen accepts the final electron and forms water and at the same time ATP is produced.

Hence, the correct option is mitochondria.

answer:   option a) glucagon was secreted by his pancreas before he ate the cookies because blood glucose was low. insulin was secreted after he ate the cookies because his blood glucose was high.

explanation:

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!