Question

question 1 1 pts red blood cells are placed in an unknown solution. after 45 minutes, the cells are examined and determined to have decreased in size. the unknown solution is hypertonic. isotonic. hypotonic. osmotic. question 2 1 pts transcription can best be described as the synthesis of trna. reading of mrna codons by trna. synthesis of mrna. synthesis of polypeptides at a ribosomal site. question 3 1 pts in the dna molecule, a sequence of three base pairs forms a(n) codon. anticodon. polymerase. none of the above.

Explanation:

• Question 1: In a hypertonic solution, water moves out of the red - blood cells by osmosis, causing them to shrink. In isotonic solutions, there is no net water movement, and in hypotonic solutions, water moves into the cells causing them to swell. Osmotic is a general term related to osmosis and not the specific type of solution here.
• Question 2: Transcription is the process of synthesizing mRNA from a DNA template. The synthesis of tRNA is a different process, reading of mRNA codons by tRNA is part of translation, and synthesis of polypeptides at a ribosomal site is also translation.
• Question 3: A codon is a sequence of three base pairs (in mRNA, but conceptually related to DNA sequence) that codes for an amino - acid. An anticodon is on tRNA and pairs with the codon, and polymerase is an enzyme involved in DNA or RNA synthesis.

Answer:

Question 1: A. hypertonic
Question 2: C. synthesis of mRNA
Question 3: A. codon