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Question: double check a few questions 1nucleic acids such as dna...

Question details

Double check a few questions:

1)Nucleic acids such as DNA are polymers of nucleotides. Each nucleotide consists of a five-carbon sugar bonded to a nitrogen base and a phosphate molecule. Each carbon on the sugar is numbered with primes according to chemical convention. Which carbon on the deoxyribose sugar is the nitrogen base bonded to AND how many hydrogen bonds are between nitrogenous bases in a double-stranded DNA molecule:

a) carbon Bonded to the nitrogenous base 1' # of Hydrogen bonds 3, Nitrogenous Bases A&T

B) carbon Bonded to the nitrogenous base 1' # of Hydrogen bonds 3, Nitrogenous Bases C&G

C) carbon Bonded to the nitrogenous base 2' # of Hydrogen bonds 2, Nitrogenous Bases C&G

D)carbon Bonded to the nitrogenous base 2' # of Hydrogen bonds 2, Nitrogenous Bases A&T

** I picked c, is that correct?

2) DNA replication is called semi-conservative because _a_ of the two new strands of DNA is old DNA from the original DNA molecule and __b__ is new DNA. the options for answers are "half, all or none"

***I picked a)none, and half

3)Why does DNA have a leading strand and a lagging strand during replication?

Select the correct row below that fills in the following blanks to answer the question above.

___1st___ has to attach the new free-floating nucleotides to the ___2nd___ of the newly formed strand. The two strands of a DNA molecule are antiparallel, so in order for the lagging strand to be formed in the same direction, it has to be done in Okazaki fragments going in a ___3rd___ direction

Options are:

a) 1st DNA Ligase, 2nd 3' end 3rd 5-3'

b) 1st DNA Polymerase, 2nd 3' end 3rd 5-3'

c) 1st DNA Polymerase, 2nd 5' end, 3rd 3-5'

d) 1st DNA Helicase, 2nd 5' end, 3rd 3-5'

** I picked b, is that correct?

4 question

Bacteriophages are viruses that infect bacteria. Depending on the bacteriophage, their genome can be made of either single or double-stranded DNA or RNA.
The composition of genetic material found in a bacteriophage is found to be 25% A, 33% T, 24% G, and 18% C. What can you conclude about the genetic material of this virus?

Select one:

a. It is single-stranded DNA.

b. It is single-stranded RNA.

c. It is double-stranded RNA.

d. It is double-stranded DNA.

** I picked a.

Question 5

A DNA nucleotide triplet that codes for the amino acid threonine is

Select one:

a. TCG

b. TGT

c. ACC

d. UGA

I picked c.

Question 6

A DNA antisense strand contains the following nucleotide base sequence:
ACG TTT ATG GGT
From this, what is the nucleotide sequence of the mRNA strand that is transcribed?

Select one:

a. ACG UUU AUG GGU

b. AGC UUU AUC CCU

c. TGC AAA TAC CCA

d. UGC AAA UAC CCA

*** I got d

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