Science at Distance

Biological Information

Lecture Notes - Part 2 Biological Information - Topic Outline

This Bio-Module requires the use of the text book "Exploring Life" by Professor John Blamire.

Quick Check

Read Chapter 9, Biological Information pages 114 to 117.
Read your lecture notes, and, if necessary, cross check your notes with the "Lecture Notes - a check up".
Read each of the "Quick Questions" below and write down your answer.
When you have finished the test, click on the "ANSWERS" button and see how well you have done.

Test Number BI-2025

Quick Questions

1) RNA is the primary molecule used by cells to store biological information. (True or False)

2) The flow, and expression, of biological information takes place in a series of stages which can occur in any order. (True or False)

3) Messenger RNA (mRNA) is made by a process called translation. (True or False)

4) Transcription uses one strand of the DNA molecule as a template and copies the information. (True or False)

5) Messenger RNA is decoded in the cytoplasm of cells. (True or False)

6) Polypeptides unfold in the cytoplasm of a cell to form a functional protein. (True or False)

7) The language of the genetic code is written as a linear sequence of amino acids in the polypeptide. (True or False)

8) The genetic code has four letters, A, T, G, and C. (True or False)

9) There are 64 codons in the genetic code. (True or False)

10) The codon AUG is the start signal and is the first one translated. (True or False)

11) Ribosomes become attached to transfer RNA (tRNA) molecules before the translation process can begin. (True or False)

12) Bacterial ribosomes consist of two subunits, a larger 50S subunit and a smaller 30S subunit. (True or False)

13) Bacterial ribosomes consist of protein, RNA molecules and sugars. (True or False)

14) Transfer RNA (tRNA) is a large molecule consisting of thousands of nucleotides joined together in 4 loops. (True or False)

15) Transfer RNA is a small molecule with three loops. (True or False)

16) The anticodon is found on the tRNA molecule on the loop opposite the stem where the amino acid is joined. (True or False)

17) A fully functional ribosome has two sites for binding tRNA molecules, the A-site and the B-site. (True or False)

18) Anticodons on tRNA match codons on the mRNA during the translation process. (True or False)

19) As the polypeptide chain grows, it remains attached to a tRNA molecule. (True or False)

20) The growing polypeptide chain is moved from one tRNA molecule to the second tRNA molecule on the ribosome. (True or False)

21) At the end of the elongation cycle the completed polypeptide chain is moved from the last tRNA onto the ribosome. (True or False)

22) Stop codons are never translated. (True or False)

23) Most proteins have no secondary structure. (True or False)

24) Mutations are alterations in the sequence of nucleotide bases on a DNA, and are caused by mutagens. (True or False)

25) X-radiation is a powerful mutagen. (True or False)

Answers to Part 2
Lecture Notes -
Part 1
Lecture Notes -
Part 2
Lecture Notes -
Part 3
Biological Information - Topic Outline

Science at a Distance
© 1997, 1998, 1999, 2000 Professor John Blamire