Question

1. the _ of a trna molecule will base pair with the codon of a mrna molecule.

a. dna sequence b. anticodon c. codon d. rna polymerase

1. a piece of dna that contains sequences from two or more different organisms is called _ dna.

a. inverse b. species - specific c. recombinant d. semi - conservative

1. if the normal nucleotide sequence was tacggcatg, what type of gene mutation is present if the resulting sequence becomes taggcatg?

a. chromosomal mutation
b. germinal egg cell mutation
c. deletion mutation
d. substitution point mutation

1. ribosomes are composed of

a. fat. b. rna. c. glucose d. dna

1. if a cell lacked ribosomes, it would not be able to

a. form a steroid.
b. synthesize proteins.
c. emulsify a fat.
d. hydrolyze fat.

1. which of the following nucleotide bases is found only in rna, not in dna?

a. guanine b. adenine c. thymine d. uracil

1. a gene is physically located on the _ of the cell.

a. membrane b. messenger rna c. chromosome d. proteins

Explanation:

• Question 9: In translation, the anticodon of tRNA pairs with the codon of mRNA.
• Question 10: Recombinant DNA contains sequences from different organisms.
• Question 11: A substitution point mutation occurs when one nucleotide is replaced by another. Here, C is replaced by G.
• Question 12: Ribosomes are composed of RNA (rRNA).
• Question 13: Ribosomes are the site of protein synthesis.
• Question 14: Uracil is found only in RNA.
• Question 15: Genes are located on chromosomes.

Answer:

1. B. anticodon
2. C. recombinant
3. D. substitution point mutation
4. B. RNA
5. B. synthesize proteins
6. D. uracil
7. C. chromosome