Since cells of Halobacterium require high levels of Na+ for growth,why is this not true for the organism’s cytoplasmic enzymes?

Why is lactose not fermented by yeast?

Which of the following describes a purpose for the function of phosphoglucoisomerase? a) allows for phosphorylation for trapping the molecule in the cell b)promotes substrate level phosphorylation and formation of ATP c) allows formation of a primary alcohol necessary for the next step of phosphorylation d)facilitates epimerization, the change in stereochemistry at one chiral carbon

While endocytosis and exocytosis refer to the direction in which a vesicle moves into and out of a cell respectively, it is important to think about what is being moved with and within the vesicles. To demonstrate how this process is utilized in human cells we will focus on the human body's insulin response. The purpose of the insulin response is to create a pathway for glucose entry into cells by releasing glucose transporters into the membrane. Cell Type #1- insulin producers: In humans, pancreatic B-cells create steroid insulin that can be packaged into vesicles starting at the ER. These vesicles are prepared for exocytosis so that the insulin can be released from the pancreatic B - cells and get into the bloodstream when signaled to do so. When glucose is present in the blood stream these cells will release the pre-packed insulin into the blood stream. Cell Type #2- insulin responders: Other cells do not produce insulin but instead respond when they have received the insulin signal…

In an adipose cell, after being synthesized by the ribosomes and the rough endoplasmic reticulum a protein involved in hydrolysis of lipid could be transported to the: a) mitochondrion, b) smooth endoplasmic reticulum, c) Golgi apparatus, d) Chloroplasts, e) nucleus

What is reverse electron transport and why is itnecessary in purple sulfur bacteria?

Plasmodium use digestive vacuoles (DV) to digest hemoglobin and heme from red blood cells into fuel sources for their life cycle. The DV is the site where host proteins are degraded by the parasite and then the peptide pieces are exported into the Plasmodium cytosol for use in biosynthesis. Plasmodium falciparum chloroquine resistance transporter, PfCRT, is a transporter in this DV membrane and its original function was unknown until recently. Researchers digested hemoglobin into peptide fragments and then tested the effect of these fragments on PfCRT function. VF-6-2 is one of these fragments of hemoglobin and apparently a natural substrate of PfCRT. Chloroquine, for which the transporter was originally named, is a substrate only of mutant transporters. One mutant PfCRT, for instance, has K76T in its substrate binding site and thus a significantly lower Km for chloroquine, inspiring the original name of the transporter, because of its importance for drug resistance in malaria…

Nitrogenase complexes are irreversibly inactivated by oxygen. Explain how nitrogen-fixing bacteria solve this problem.

What is the nucleophile that chymotrypsin employs to attack the substrate carbonyl carbon atom?

Identify the protein component of the transmembrane complex used by the salt-loving archaean Halobacterium halobium, which uses sunlight to create a proton gradient for ATP synthesis. bacteriochlorophyll bacteriorhodopsin cytochrome c chlorophyll retinal