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WorksheetsQUIZ #2: DNA or RNA?
Total questions: 25
Worksheet time: 14mins
DNA stands for?
(a)
RNA stands for?
(a)
DNA and RNA both carry genetic information, but there are quite a few differences between them.
True
False
B-form double helix, double-stranded molecule consisting of a long chain of nucleotides.
DNA
RNA
A-form helix, usually a single-strand helix consisting of shorter chains of nucleotides.
DNA
RNA
Composition:
deoxyribose sugar
phosphate backbone
adenine, guanine, cytosine, thymine bases
DNA
RNA
Composition:
ribose sugar
phosphate backbone
adenine, guanine, cytosine, uracil bases
DNA
RNA
Self-replicating
DNA
RNA
Synthesized from DNA on an as-needed basis (if needed by the body)
DNA
RNA
AT (adenine-thymine)
GC (guanine-cytosine)
DNA
RNA
AU (adenine-uracil)
GC (guanine-cytosine)
DNA
RNA
The C-H bonds make it fairly stable, plus the body destroys enzymes that would attack it. The small grooves in the helix also serve as protection, providing minimal space for enzymes to attach.
DNA
RNA
The O-H bond in the ribose makes the molecule more reactive.
DNA
RNA
The small grooves in the helix also serve as protection, providing minimal space for enzymes to attach.
DNA
RNA
It is not stable under alkaline conditions.
DNA
RNA
The large grooves in the molecule make it susceptible to enzyme attack.
DNA
RNA
It is constantly produced, used, degraded, and recycled.
DNA
RNA
Susceptible to UV damage.
DNA
RNA
It is relatively resistant to UV damage.
DNA
RNA
Most scientists believe RNA evolved before DNA because:
RNA has a simpler structure needed for DNA to function
RNA has a more complex structure than DNA.
RNA is found only in eukaryotes.
DNA can act as a catalyst for chemical reactions.
One of the main reasons DNA likely evolved is:
Proteins surrounding RNA provide additional protection.
DNA is easier to replicate than RNA.
Double-stranded molecules help protect the genetic code from damage.
RNA can act as a catalyst for all chemical reactions.
Which of the following statements is true regarding unusual forms of DNA?
Double-stranded RNA has thymine instead of uracil.
There is evidence for branched and quadruplex DNA.
Circular double-stranded DNA is found in prokaryotes only.
Arsenic cannot substitute for phosphorus in DNA.
Double-stranded RNA (dsRNA) can sometimes occur
True
False
This type of RNA is found in some viruses and can interfere with normal RNA function in eukaryotic cells, stimulating an interferon response. What is this type of RNA called?
Single-stranded RNA (ssRNA)
Double-stranded RNA (dsRNA)
Circular RNA (circRNA)
Ribosomal RNA (rRNA)
What is currently known about circular single-strand RNA (circRNA)?
It is common in all organisms and has well-defined functions.
It has been found in both animals and plants, but its function is unknown.
It is always harmful to the host organism.
It acts as a template for DNA replication.
