Answers to the labeled structures:

A = nucleoli 

B = nuclear membrane 

C = nuclear por 

D = chromatin made of DNA molecules 

E = centriole pair 

F = Endoplasmic reticulum 

You should of learned these in miniunit Beta. 

In your notes identify the chemical make-up of these structures. You may want to go back and review parts of miniunit Beta. 

1. Identify the structure labeled in the figure above consisting of condensed RNA/protein and give its function in a working cell.
 

a) A : synthesis of RNA to form ribosomes 

b) B : contains the human genome 

c) C : controls cell division 

d) B : allows for selective absorption 

e) A : contains the human genome 

 
2. DNA is located in which structure of a eukaryote nucleus. 

a) nucleolus 

b) nuclear envelope (double membrane) 

c) nuclear pore 

d) chromatin 

e) centriole pair 

f) E.R. 

 
3. The main chemical components of chromosomes and chromatin are: 

a) carbohydrates and DNA 

b) lipids and DNA 

c) protein and carbohydrates 

d) DNA and protein 

4. In the figure above which structure is not found in higher plant cells? 

a) A 

d) E 

b) C 

e) F 

c) D 

 
                            k

5. Which of the following structures below indicated by the letter represented in the figure does not match with the correct function?

a) A : synthesis of RNA to form ribosomes 

b) D : contains the human genome 

c) C : allows large molecules to pass through the nuclear membrane 

d) F : prevents the genes from replicating 

e) E : organizing center for spindle fibers in animal cells 

 
6. In the figure above the chromosomes are in the form of (choose an answer):
     The correct answer moves you to the next page.

          a) DNA molecules scattered throughout the nucleoplasm - chromatin
          b) distinguishable rod shaped structures - chromosomes
          c) DNA molecules scattered throughout the cytoplasm - cytoskeleton
          d) proteins in the form of microbodies - centrioles 
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