19

40) During which stage of meiosis does crossing-over occur? 
          A) Prophase 1 
 

B) Metaphase 1 

C) Anaphase 11 

D) Prophase 11 

E) Metaphase 11 

 
41) Prior to protein synthesis, the DNA 
          A) Attracts tRNAs with appropriate amino acids 
 

B) Must first undergo replication 

C) Contains anticodons that must become codons 

D) Serves as a template for the production of mRNA 

E) Attaches to ribosomes for protein synthesis 

 
42) Which of the classes of RNA molecules carries the amino acids that are added  
       to the growing polypeptide chain? 
 

A) Ribosomal RNA 

B) Transfer RNA 

C) Messenger RNA 

 D) 

Primary 

RNA 

E) Secondary RNA 

 
43) The process of converting the “message” of mRNA into a sequence of amino  
        acids is called: 
 

A) Translation  

 B) 

Transcription 

 C) 

Replication 

 D) 

Activation 

 E) 

Duplication 

 
44) Suppose one strand of a “mini-gene” has the base sequence TACCCGGATTCA.   
       The last codon in the mRNA sequence will be: 
          A) UGA 
 B) 

AGT 

 C) 

AGU 

 D) 

TCA 

 E) 

ACT 

 
45) Traits controlled by sex-linked recessive genes are expressed more often in  
        males because: 
 

A) Males inherit these genes from their fathers 

B) Males always carry two copies of these genes  

C) All male offspring of a female carrier get the gene 

D) The male has only one copy of these genes 

E) Males get more copies of recessive genes than females do