Write all possible codons recognized by each of the given anticodons. An anticodon strand reads 5'–GCG–3'. Fill in the missing base sequences for the possible codons recognized by the anticodon.

Codon: 3'-CGC-5'

Codon: 3'-UGC-5'

Explanation:

The anticodons of tRNAs bind to the complementary codons of mRNA. The mRNA codons are always read in 5' to 3' direction. The 5' base of an mRNA codon pairs with 3' base of the anticodon of tRNAs. The first base of the anticodon (the  5' base) determines the number of mRNA codons that are recognized by the tRNA. When the 5' base of the tRNA anticodon is U or G, it binding with codon is less specific. A tRNA anticodon with 5’ G base can read two different codons.  

Anticodon:  5'–GCG–3'.

Codon: 3'-CGC-5'

Codon: 3'-UGC-5'

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.