What element they are:

1.My appearance at standard state is a silvery-white. My density when I melt is 1.46g/cm3. I burn purple, and react violently on contact with water. I see use in atomic clocks, and sometimes in glass

2.I am a diatomic molecule with a melting point of -259.14˚C and have a lower density than any other element.I am highly flammable and commonly form compounds with non-metals and halogens.I am commonly found in a product used to clean wounds and am one of the main elements involved in making stars shine

3.I am Silver-White in colour and I am so reactive I must be stored in oil.You may find me colouring glass windows in a church or reacting with water or acids to form hydrogen gas.I also oxidize and produce a film which tarnishes my Silver-White skin and can be used with other metals to form alloys

4.My soluble compounds are toxic to mammals yet I am used in paint, I am a soft but highly reactive metal. I am used in medical imaging but I am non-radioactive.

5.I am a poor conductor of heat or electricity, and my boiling point is at 536F.I am used as a fertilizer for soil and I help extinguish fire from common combustible, liquid, gas and electricity.

6.I get my name from the greek word meaning “moon”.I have 6 natural isotopes.I am protective against mercury poisoning, and my salt is used to control dandruff

7.I am a solid crystal yellow at room temperature. My melting point is , and I don’t dissolve in water I react with most elements when heatedI am famous for burning in air and producing a blue flame.I prevent rubber materials from melting, as they get warmer. I am also used to treat acne

8.I am useful inside the body and outside the body I help heal wounds. My boiling point is 184 degrees and my name is derived from my colour. A crystalline solid that gives off a coloured gas on heating and can be found in most seaweed

9.My alloy will chill out cast iron and colour ceramics. I can strengthen lead or make acids more corrosive. Some of my amino acids are fun guys but can be harmful in large groups.

10.I'm part of the p block, my standard state is a solid.
I'm a post transition metal, I'm silvery white in colour.
When evaporated i can produce a mirror as reflective as silver, my name means violet.

8. An a-helix would be stabilized most by:

       A     the presence of an Arg⁺ residue near the carboxyl terminus of the a-helix.

       B     the transmission of the protons of several peptide bonds throughout the a-helix.

       C     the presence of two Lys⁺ residues near the amino terminus of the a-helix.

       D     interactions between neighboring Asp^- and Glu^- residues

       E      interactions between two adjacent amino acid residues with large and bulky side chains.

Can you please explain why the answer is A

Thanks

1. What non-covalent interactions can (1) Alanine and (2) Threonine acid participate in, as part of tertiary structure at pH 7? Include an explanation of the charges involved (full or partial, permanent or temporary)?

2. Suggest one amino acid whose side chain can participate in a non-covalent interaction with the side chain of alanine, and one amino acid whose side chain can participate in a non-covalent interaction with the side chain of threonine.

Compare the shuttle systems for transporting fatty acids into the mitochondria and acetyl-CoA into the cytosol.

1.Acids commonly dissociate to give hydrogen ions insolution (H+), while bases dissociate to give hydroxide ions in solution (OH-). Why is it important to know the difference between acids and bases, in terms of safety? 2.Ionic bonds, covalent bonds and hydrogen bonds all help to hold chemical entities together. Distinguish between these types of bonding and explain which type of bonding is responsible for matching the base pairs in DNA.

Explain the toxic effects of excessive ethanol consumption on metabolism. In your answer, explain both the toxicity of ethanol metabolites at a molecular level and the specific effects of ethanol degradation on the major pathways we have studied (e.g., glycolysis, Krebs cycle, and the pentose phosphate pathway, to name a few).

"Most microbes use carbohydrate (glucose) as the energy sources (via glycolysis, kreb's cycle, and electron transport chains). However, some microbes also use lipid or protein as the energy resources". Describe how energy (ATP) can be generated from the catabolism of: (a) Lipid (b) Protein .

In glycolysis, the conversion from pyruvate to acetyl CoA is irreversible, but I found that during the synthesis of FA, acetyl CoA can be synthesized to citrate -> OAA -> Malate ->pyruvate when Citric acid shuttle, why we cannot say that pyruvate can turn back to acetyl CoA?

State if each of the following processes release or required ATP: (ATP PRODUCED OR CONSUMED)

a. citric acid cycle

b. glucose forms two pyruvate

c. pyruvate forms acetyl CoA

d. glucose forms glucose-6-phosphate

f. First six reactions of glycolysis