The Paleozoic Era ended with the largest extinction event in the history of Earth, the Permian–Triassic extinction event. The effects of this catastrophe were so devastating that it took life on land 30 million years into the Mesozoic Era to recover
Ans.
Steroids are defined as active organic bio-molecules, having four rings with a specific molecular configuration. Steroids play role in two major functions: as hormones or signaling molecules and as structural components of plasma membrane.
Examples of steroid hormones are estrogen, progesterone, and cortisol. Thus, the correct answer is 'option b). they serve as chemical messengers.'
There’s proteins (muscle) lipid (fat) calcium )bones) and carbohydrates (mostly for energy)
Answer:
e. They must maintain a pH of 7 in order to function properly.
Explanation:
The pH in lysosome is between 4,5 and 5 because that is the optimal pH for hydrolytic enzymes that are involved in hydrolysis.
The lysosome maintains its pH by pumping in protons from the cytosol via proton pumps and chloride ion channels. Vacuolar-ATPases are responsible for transport of protons and they require ATP hydrolysis for their function. The transport of chloride ions is performed by Cl−/H+ antiporter.
Answer:
Answer:
B. Erosion and D. Index fossils are geologic features that help scientists to determine relative ages of rocks by their positions.
Explanation:
