practice exams A & B

Which of the following combinations (A-D)  accurately describes the directionality of the double stranded DNA fragment below? Select only ONE answer choice.

Answer D

Of the following four 15 base-pair, double-stranded DNA sequences, which will be most stable at higher temperatures? In other words, which will most likely remain in a double-stranded form? Select only ONE answer choice. 

CCCGCATCGCCATCG

Imagine that the value of a nucleotide is calculated as the percent of DNA it accounts for. For example, 30% of DNA may be A. If this were the case, the value of (A + C)/(G + T)...

is equal to one if the DNA is double-stranded

Based on the diagram below, identify:

1. What process does the diagram illustrate?

2. DNA strand type? Coding or Template?

3. DNA strand type?  Coding or Template?

4. Directionality of growing nucleic acid at 4? (i.e. 5’ or 3’)

Select only ONE answer choice. 

Answer C

Consider the following sequence of bases in DNA that are part of the TEMPLATE STRAND of a gene that codes for a particular mRNA strand. The introns and exons have been indicated in the image below. Nucleotides that are bolded are part of exons; nucleotides that are not bolded are part of introns.

Assuming transcription occurs, the sequence of the mRNA transcript ultimately found in the cytoplasm for this sequence of bases would be:

5’ – UGC CAG UCC GUU – 3

True or False: Genes code for chromosomes and chromosomes are responsible for the individual traits we observe.

False

The backbone of this polymer is shown in box ______. The functional group denoted with ______ is necessary for the addition of the next monomer. Select only ONE answer choice.

W, X

Given the coding strand of DNA below, choose the correct RNA transcript.

5’ – ATGGCATTAGGGCGTTGA – 3’

5’ – AUGGCAUUAGGGCGUUGA – 3’

Which protein is responsible for holding the two parental DNA strands separated for DNA replication to proceed?

Single strand DNA binding protein

Which of the following is NOT a difference between DNA and RNA?

a. DNA is double-stranded while RNA is single-stranded

b. RNA includes Uracil while DNA includes Thymine

c. DNA has the sugar deoxyribose while RNA has the the sugar ribose

d. All of the above are differences between RNA and DNA

DNA replication occurs in the 5' to 3' direction in the leading strand, but 3' to 5' in the lagging strand.

False

Both the leading strand and the lagging strand require a total of one primer each to synthesize the complementary daughter strands.

False