17) During cellular respiration, acetyl CoA accumulates in which location? A) cytosol B) mitochondrial outer membrane C) mitochondrial inner membrane D) mitochondrial intermembrane space E) mitochondrial matrix

The correct answer is: E) mitochondrial matrix.

Explanation:

Cellular respiration is the series of steps in which the glucose molecule is converted into the ATP necessary for the energy requirements of the cell.

Cellular respiration can be divided into 4 processes: glycolysis (the glucose molecule is converted into two molecules of pyruvate), oxidative decarboxylation of pyruvate (in which both pyruvates are oxidized to acetyl-CoA and CO2), Krebs cycle (here the acetyl-CoA is used as a substrate and enters a cycle with NADH, FADH2 and ATP as products), and oxidative phosphorylation (the molecules gained in the previous step are used in an electron transport chain to generate the proton gradient necessary for ATP synthesis).

Acetyl-CoA, which appears during the oxidative decarboxylation of pyruvate and is used in the Krebs cycle, is accumulated in the mitochondrial matrix, which is the place in which both of these processes occur.

E) mitochondrial matrix

Explanation:

It is known as the Krebs cycle, which is a process that comprises a sequence of eight reactions that take place in the mitochondrial matrix, in which acetyl-Co A adheres to oxalacetic acid, giving rise to a 6-carbon molecule, citric acid, which through two decarboxylations, and through continuous transformations to the initial four-carbon molecule, thereby closing the cycle.

hormones in blood stream

image: dtc.ucsf.edu

endocrine glands secrete hormones into the blood stream near them; the hormones then travel in our bloodstream until it reaches its destination, called a target cell, in distance parts of the body. in the target tissue, hormones lock onto the target’s plasma membrane, called the receptor site.