Why are some of the geological time periods not represented in the strata forming the grand canyon? a. the age of some of the grand canyon's layers is unknown. b. unconformities resulted in the erosion of some representative layers. c. during certain times of earth's past, sedimentary layers were not forming. d. most of the grand canyon's layers are made of igneous and metamorphic rocks.  is the answer b?

To answer your question Yes, the correct answer is B. Hopefully this helps!

hydroxyl -oh

alcohols, always polar, can form hydrogen bonds with h2o molecules

carboxyl -cooh  

cargoxylic acids, has acidic properties which is a source of hydrogen ions, found in cells in ionized for with a charge of oh-1

carbonyl > co

ketone if within skeleton, aldehyde if group is at the end of skeleton, k & a may be structural isomers, it determines 2 sugars (ketose & aldose)

amino -nh2

amines, acts as a base, it can pick up h+ ions from surrounding solution, ionized with charge of 1+

methyl ch2

addition to rna/dna affects and gene expression

phosphate -opo3 ²⁻

organic phosphates, contributes to negative charge to, molecule that it is a part of, and potential to react with h20

sulfhydryl -sh

thiols, cross-linking stabilize the protein, and it is structure