Question

QUESTION 28

1. Current evidence indicates the first humans infected with HIV lived in

   		a. Haiti
   		b. Indonesia
   		c. Africa
   		d. San Francisco

2 points   

QUESTION 29

1. If nondisjunction occurs in one chromosome pair in meiosis I during gametogenesis, what will be the result at the completion of meiosis?

   		a. All the gametes will be diploid.
   		b. Half of the gametes will have an extra chromosome, and half will be missing one.
   		c. There will be three extra gametes
   		d. Two of the four gametes will be haploid, and two will be diploid.

2 points   

QUESTION 30

1. What is the reason that alleles of linked genes are usually inherited together?

   		a. They are located close together on the same chromosome.
   		b. The number of genes in a cell is greater than the number of chromosomes.
   		c. Chromosomes are unbreakable.
   		d. Alleles are paired together during meiosis.

2 points   

QUESTION 31

1. This is the pedigree of a family with dry earwax syndrome, a single gene trait. Individuals with dry earwax often need professional flushing of the ear canals to avoid blockage. Individuals with dry earwax also have less body odor, and are less likely to get breast cancer. Affected individuals are colored circles and squares. Open circles and squares indicate those with normal wet earwax. Based on the pedigree, does this dry earwax appear to be dominant or recessive?

   		a. Dominant: Almost half the family has it
   		b. Recessive: Mostly boys are affected
   		c. Dominant: Every affected parent has an affected child
   		d. Recessive: Unaffected parents can have an affected child

2 points   

QUESTION 32

1. Which of the following is an example of a genotype?

   		a. Blood type O
   		b. Curly hair
   		c. Dwarfism is defined as an adult 4’ 10” or shorter
   		d. Someone has two copies of the allele for brown eyes, BB

2 points   

QUESTION 33

1. In the table above, what does the word “stop” mean?

   		a. The ribosome will stop and release the completed peptide
   		b. The RNA polymerase will stop transcribing the gene
   		c. Mutations will not occur here
   		d. Primary transcript modification stops

2 points   

QUESTION 34

1. Which of the following does not occur in prokaryotic gene expression, but does in eukaryotic gene expression?

   		a. mRNA, tRNA, and rRNA are transcribed.
   		b. RNA polymerase binds to the promoter.
   		c. A poly-A tail is added to the 3' end of an mRNA and a cap is added to the 5' end.
   		d. Transcription can begin as soon as translation has begun even a little.

2 points   

QUESTION 35

1. Small nuclear RNAs, or snRNAs, have several functions including:

   		a. Preventing translation of mRNAs
   		b. Preventing transcription of new mRNAs
   		c. Cutting out introns during RNA processing
   		d. Preventing the DNA from unwinding

2 points   

QUESTION 36

1. This pedigree is for a family with Marfan syndrome. Marfan syndrome causes abnormal skeletal growth, long limbs, excessive height and sometimes heart defects. Dark-colored symbols are individuals affected with the disease, light symbols are phenotypically normal. Squares are males, circles are females. Using the pedigree, does Marfan syndrome look like it is dominant or recessive?

   		a. Dominant
   		b. Recessive
   		c. Co-dominant
   		d. Not enough information given

2 points   

QUESTION 37

1. Which enzyme catalyzes the elongation of a DNA strand in the 5' → 3' direction?

   		a. primase
   		b. DNA ligase
   		c. DNA polymerase
   		d. Topoisomerase

Answer 1