Mol Bio quiz 1

The observable traits expressed by an organism are described as its

• Allele

• Genotype

• Phenotype

• Zygote

In pea plants, smooth seeds (S) are dominant to wrinkled seeds (s). In a genetic cross of two plants that are heterozygous for the seed shape trait, which is the correct representation for the Punnet square?

• 
• 
• 
• 

A segment of single stranded DNA contains 120 Adenine, 120 cytosine, 60 guanine and 40 thymine bases. What are the total number of nucleotides present in the segment?

• 240

• 160

• 180

• 340

Incomplete dominance can result in

• Trait that is a mix of those seen in the parents

• The offspring having a different trait than either parent

• Either A or B

• Neither A nor B

Which of the following is true about DNA melting temperature, tm?

• Majority molecules in the solution will be in single-stranded form at Tm

• The higher the content of G ≡ C base pairs, the higher the tm

• The higher the content of A = T base pairs, the higher the tm

• The higher the content of G ≡ C base pairs, the lower the tm

If the sequence of the 5’ to 3’ strand is AATGCTAC, then the complementary strand has the following sequence:

• 3’-AATGCTAC-5’

• 3’-CATCGTAA-5’

• 3’-TTACGATG-5’

• 3’-GTAGCATT-5’