A strand of mRNA has the bases guanine-adenine-uracil . Which amino acid
corresponds to these bases?
Messenger
Second base in codon
RNA Codons U
С
А
G
UUU TUCU UAU JUGU
U
UUC)
Phe
UCC UAC)
Tyr
UGC
Cys
U
Ser
UUA JUCA
Leu
UAA Stop UGA Stop A
UUG UCG UAG Stop UGG Trp G
CUU CCU CAU CGU U
CUC CCC
His
|САС ICGC
C
Leu
Pro
CUA CCA
Arg
CUG
CCG CAG
CGG
AUU ACU AAU
Asn
AGU
AUC
Ser
lie ACC AAC)
Thr
AGCI
AUA ACA AAA1
AUGS ACG
AGA
Lys
|AAG
Arg
AGG
GUU GCU
GAU)
GUC
GGU
GCC GAC)
Asp
GGC
G
Val
Ala
GUA
GCA
GI
GAAL
Glu
GGA
GUG GCG GAG) GGG
с
ICAA
First base in codon
Gin CGA
BUCODUODO Coposle
Third base in codon
A. Ser
B. Val
C. Ang
D. Asp

Listed in the item bank are some key terms and expressions associated with the categories seen in the venn diagram. to find out more information about items, some have more details available when you click on them. drag and drop each item onto the proper area of the diagram. if an item describes more than one category, be sure to place it in the overlapping space. viruses are tiny infectious pathogens that cause many different diseases, such as polio, and the flu. though they are similar to one celled organisms in some ways, in many ways they are very different. use the venn diagram below to show the similarities and differences between viruses and living organisms.

Rease is an enzyme used by plants to break down urea (a nitrogen-containing compound) into carbon dioxide and ammonia. urease urea > > > carbon dioxide and ammonia ammonia is broken down by plants into a nitrogen source plants need to grow. thus, plants could not use urea as a nitrogen source unless it was first converted to ammonia. in soybean plants there are two different kinds of urease, one produced in the seeds and the other produced in the leaves of the plant. three types of soybean plants were used in a set of experiments: normal soybeans and two mutant strains, one lacking the urease in the seeds only (strain 1) and one lacking urease in the leaves only (strain 2). experiment 1 separate areas in a field were planted with normal, strain 1, and strain 2 soybeans. all types of soybeans appeared to grow, flower, and produce seeds equally well. there were no externally detectable differences among the strains. experiment 2 small pieces of plant leaves of equal weight were obtained from each type of soybean plant and separately placed on media in culture dishes. tissue growing in this way will become an unorganized clump of cells referred to as callus. to provide a controlled nitrogen source, half the tissue samples of each type were placed on media containing urea, and the other half of the samples were placed on media containing ammonia. after 30 days, the weight gain for each of the callus samples was determined. results are shown in the table below.

Most of the carbon on earth is stored in the form of