Question

1. circle the letter of each sentence that is true about translation.

a. before translation occurs, messenger rna is transcribed from dna in the nucleus.
b. translation occurs in the nucleus.
c. it is the job of transfer rna to bring the proper amino acid into the ribosome to be attached to the growing peptide chain.
d. when the ribosome reaches a stop codon, it releases the newly formed polypeptide and the mrna molecule.

1. what is an anticodon?

the roles of rna and dna
match the roles with the molecules. molecules may be used more than once.
roles

1. master plan
2. goes to the ribosomes in the cytoplasm
3. blueprint
4. remains in the nucleus

molecules
a. dna
b. rna
genes and proteins

1. many proteins are _, which catalyze and regulate chemical reactions.
2. is the following sentence true or false? genes are the keys to almost everything that living cells do.

Explanation:

18.

• a. Transcription of mRNA from DNA in nucleus precedes translation, so this is true.
• b. Translation occurs in the cytoplasm at ribosomes, not in the nucleus, so this is false.
• c. t - RNA brings amino - acids to ribosome for peptide - chain growth, so this is true.
• d. When ribosome reaches stop codon, it releases polypeptide and mRNA, so this is true.

1. An anticodon is a three - nucleotide sequence on a t - RNA molecule that is complementary to a specific codon on an mRNA molecule.
2. DNA is like a master plan, so the answer is a. DNA.
3. mRNA (a type of RNA) goes to the ribosomes in the cytoplasm, so the answer is b. RNA.
4. DNA can be considered a blueprint, so the answer is a. DNA.
5. DNA remains in the nucleus (while RNA can move out), so the answer is a. DNA.
6. Many proteins are enzymes which catalyze and regulate chemical reactions.
7. Genes are crucial for almost all functions of living cells, so the statement is true.

Answer:

1. a. True, c. True, d. True
2. A three - nucleotide sequence on a t - RNA molecule that is complementary to a specific codon on an mRNA molecule.
3. a. DNA
4. b. RNA
5. a. DNA
6. a. DNA
7. Enzymes
8. True