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 Overview:These exercises help to “cement” the informa????on in our brain so we can use that learning in our other tasks, both in life and in this course. When we exercise our thinking outside of reading and speaking, we can remember better and accomplish more.Instructions:

  1. Complete the tasks as outlined in the DNA Worksheet (Word and PDF versions attached above for your convenience).

STRUCTURE of DNA (Worksheet #3; Module 5)

These exercises help to “cement” the information in our brain so we can use that learning in our other tasks, both in life and in this course.

Goal of this activity

· To work with the structure of DNA

Steps for Success with this activity

1. Look through the entire document, making note of what you have seen or heard previously.
Rely on your prior learning! Use that learning to build more.

2. Work hard before you consult the answer page! Healthy frustration is the foundation of real learning, so let yourself be in a bit a “quandary” before you check your answers.

3. Bring all questions and inconsistencies to the Tech Live sessions.


A. Distinguish between chromosomes, genes, and traits (OpenStax,
Concepts of Biology, section 2.1)

1. Review the definitions:

a) Chromosomes =

b) Genes =

c) Traits =

2. Draw a chromosome, then show where a gene might lay:

B. Describe the structure of DNA and how it is replicated, repaired, and protected (
OpenStax, section 9.1)

OpenStax, figure 9.4) Draw the double helix with the following labels:

Use Figure 9.4:

a) Sugar phosphate backbone

b) Base pair

c) A = adenine

d) T = thymine

e) C = cytosine

f) G = guanine

g) 5’ end

h) 3’ end

BIO 1000 – Module 5 Worksheet #3, page 2

OpenStax, section 9.2)

a) Before each cell division, our DNA must be copied accurately and completely. This process is done by a “Polymerase”.

From Figure 9.9:

b) Draw the new strands that are created from the old strands: (see
Figure 9.9)

Application questions:

What happens to the genome if the replication is not accurate or complete?

What disease might result?

3. PROTECTION of DNA – What is the “end” of each eukaryotic chromosome called?

Figure 9.11) When is this part of the chromosome replaced?

Application questions:

What happens to the genome if the “ends” of the chromosomes were not protected?

What disease might result?

C. Compare the structure of DNA in eukaryotic and prokaryotic cells (
OpenStax, Figure 9.6)

1. While the structure of DNA is the same in plants, animals, bacteria, fungi and protists, the size and packaging is different between eukaryotes and prokaryotes.

2. Complete the table to compare the structure of DNA between eukaryotes and prokaryotes:

PROPERTY (Characteristic)



Size of the genome


Location of the genome

(in the cell)


(linear or circular)


(in order to fit in the cell)

D. Explain the Central Dogma (
OpenStax, section 9.3)



1. Map the Central Dogma

2. Name the process at each arrow: 1 =
; 2 =




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