Nitrogen 1

Question 1

siRNAs

Answer 1

produced by processing double stranded RNA’s (dsRNAs) in cells. These do not normally occur and are most likely formed by a replicating virus

Question 2

dicer

Answer 2

protein that processes dsRNA into 20 bp single strands and loads them onto RISC.

Question 3

Argonaute

Answer 3

enzymatic activity that occurs within RISC and can cut the double stranded si-RNA - mRNA duplex

Question 4

miRNAs

Answer 4

cellular RNAs made in duplex form (with a small bubble) and processed to form pre-miRNA. They have unpaired region of the duplex.

Question 5

Why does nitrogen metabolism occur?

Answer 5

It must be reduced (fixed) to use in biocompounds.

Question 6

Where does most nitrogen fixing occur?

Answer 6

in the soil.

Question 7

What is the product of the reaction?

Answer 7

Reduced nitrogen, most commonly in the form of ammonia

Question 8

ammonotelic

Answer 8

organisms that excrete ammonia

Question 9

uricotelic

Answer 9

organisms that excrete uric acid

Question 10

ureotelic

Answer 10

excrete urea

Question 11

transamination

Answer 11

provides easy and safe way of moving amines between amino acids. During this, amino acid and alpha-keto acid swap their amine and carbonyl O2

Question 12

glucose-alanine cycle

Answer 12

important for tissues of the body to deliver excess amines to liver/kidney for making urea

Question 13

What happens during the glucose-alanine cycle?

Answer 13

Glucose is metabolize to pyruvate, which then is transminated to alanine

Question 14

second part of glucose alanine cycle

Answer 14

Alanine travels in the blood to the liver/kindey where it transaminates alpha-ketoglutarate to make glutamic acid and pyruvate