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skeptical problems from "KAPLAN PCAT"
Started by cimdy
A. hydrogen bonds
3 bonds link G to C and 2 bonds link A to T
3 bonds link G to C and 2 bonds link A to T
well it depends
it doesn't specify between two bases
technically it could be phosphodiester bonds
it doesn't specify between two bases
technically it could be phosphodiester bonds
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The way the question is worded i would say phosphodiester bonds, if it had said on two different strands of DNA or whatnot, it would be hydrogen,
I'm pretty sure that the answer is A) hydrogen bonds
Aren't the nucleotides in DNA such as Adenine/Thymine and Guanine/Cytosine attached by hydrogen bonds?
Phosphodiester bonds exist between the phosphate group and ribose / deoxyribose sugar.
It's an ambiguous question and both A and B are correct.
Hydrogen bonding between base pairs between either RNA or DNA strands.
Phosphodiester bonding between nucleotides on the same strand (i.e. forming the strand backbone).
This type of question almost always seems to show up on biology standardized tests (i.e. GRE subject; PCAT, etc.), and they are usually trying to figure out if you know that its hydrogen bonding between pairs, it was just worded poorly here.
Hope that helps!
Hydrogen bonding between base pairs between either RNA or DNA strands.
Phosphodiester bonding between nucleotides on the same strand (i.e. forming the strand backbone).
This type of question almost always seems to show up on biology standardized tests (i.e. GRE subject; PCAT, etc.), and they are usually trying to figure out if you know that its hydrogen bonding between pairs, it was just worded poorly here.
Hope that helps!
the answer is B (phosphodiester bond)
if it was asking what the NUCLEOTIDE BASES were connected by...it would be A (hydrogen bonds)
if it was asking what the NUCLEOTIDE BASES were connected by...it would be A (hydrogen bonds)
i just opened up my kaplan
and cmidy is right
kaplan says its A
their reasoning:
"Nucleotides are linked by hydrogen bonds. A always binds to T with 2 H bonds, whereas C and G with 3 H bonds. Note that the phosphodiester bonds are covalent bonds"
don't really get why they included the little note for...
that is totally petarded
EDIT:
are there many ambiguous questions like these on the real pcat?
and cmidy is right
kaplan says its A
their reasoning:
"Nucleotides are linked by hydrogen bonds. A always binds to T with 2 H bonds, whereas C and G with 3 H bonds. Note that the phosphodiester bonds are covalent bonds"
don't really get why they included the little note for...
that is totally petarded
EDIT:
are there many ambiguous questions like these on the real pcat?
Moving to PCAT forum...
I asked my biology professor and she said the answer is B. phosphotediester bonds. Just the base pairs A-T, G-C are held together by hydrogen bonds. She also said that many practice books for PCAT, MCAT, etc. have lots of mistakes in them.
