BIOD 210 FINAL EXAM
With Atcual Solutions
Explain briefly how the idea of epigenesis and preformation directly
contradict each other: - correct ans:Preformation postulated that a fertilized
egg contained a miniaturized version of a tiny human, called homunculus.
Epigenesis directly contradicted that theory by stating that a fertilized egg
undergoes a series of developmental events that eventually form a human
Which of the following statements is correct?
- The X chromosome is much larger than the Y chromosome.
- The X and Y chromosomes share no homology.
- The X chromosome is the driving determinant for sex of an offspring.
Incorrect segregation of X and Y chromosomes (for instance a female with
XXX or X genotype) is always embryonic lethal - correct ans:The X
chromosome is much larger than the Y chromosome.
The DNA in a ________ is packaged in the head, which is shaped like a
capsule. The _________ of the phage pushes the DNA through the host cell
membrane much like a syringe. - correct ans:- phage
- sheath
The only trisomy disorder in which individuals routinely live longer than one
year is _________.The incidence seems to increase with _____________. - correct
ans:- Down syndrome (trisomy 21)
- maternal age
TRUE/FALSE: Epigenetic therapy does not depend on changes in the DNA
sequence. - correct ans:True
, In a few sentences, summarize Darwin's theory of natural selection - correct
ans:
Consider genes A, B and C which are located on a chromosome in that order.
If genes A andB cross over 40% of the time, and genes B and C cross over
30% of the time, what is the probability of a double crossover between A,B,
and C?: - correct ans:(0.4)*(0.3)=0.12, 12% chance of this crossover.
An enzyme that can be turned off by appropriate signals or conditions is
called - correct ans:repressible
The loss or gain of one chromosome, but not the set, is referred to as -
correct ans:aneuploidy
2n-1 - correct ans:monosomy
2n+1 - correct ans:trisomy
Explain how cancer cells control the extracellular matrix to drive the process
of metastasis. - correct ans:
Explain how cancer cells control the extracellular matrix to drive the process
of metastasis. Give an example of a protein we discussed that controls this in
breast cancer cells.: - correct ans:
Explain wobble hypothesis - correct ans:flexible base pairing in the third
position of the codon. This degeneracy allows for multiple codons encoding
for a specific amino acid
poly U's terminate on which end of RNA?: - correct ans:3'
With Atcual Solutions
Explain briefly how the idea of epigenesis and preformation directly
contradict each other: - correct ans:Preformation postulated that a fertilized
egg contained a miniaturized version of a tiny human, called homunculus.
Epigenesis directly contradicted that theory by stating that a fertilized egg
undergoes a series of developmental events that eventually form a human
Which of the following statements is correct?
- The X chromosome is much larger than the Y chromosome.
- The X and Y chromosomes share no homology.
- The X chromosome is the driving determinant for sex of an offspring.
Incorrect segregation of X and Y chromosomes (for instance a female with
XXX or X genotype) is always embryonic lethal - correct ans:The X
chromosome is much larger than the Y chromosome.
The DNA in a ________ is packaged in the head, which is shaped like a
capsule. The _________ of the phage pushes the DNA through the host cell
membrane much like a syringe. - correct ans:- phage
- sheath
The only trisomy disorder in which individuals routinely live longer than one
year is _________.The incidence seems to increase with _____________. - correct
ans:- Down syndrome (trisomy 21)
- maternal age
TRUE/FALSE: Epigenetic therapy does not depend on changes in the DNA
sequence. - correct ans:True
, In a few sentences, summarize Darwin's theory of natural selection - correct
ans:
Consider genes A, B and C which are located on a chromosome in that order.
If genes A andB cross over 40% of the time, and genes B and C cross over
30% of the time, what is the probability of a double crossover between A,B,
and C?: - correct ans:(0.4)*(0.3)=0.12, 12% chance of this crossover.
An enzyme that can be turned off by appropriate signals or conditions is
called - correct ans:repressible
The loss or gain of one chromosome, but not the set, is referred to as -
correct ans:aneuploidy
2n-1 - correct ans:monosomy
2n+1 - correct ans:trisomy
Explain how cancer cells control the extracellular matrix to drive the process
of metastasis. - correct ans:
Explain how cancer cells control the extracellular matrix to drive the process
of metastasis. Give an example of a protein we discussed that controls this in
breast cancer cells.: - correct ans:
Explain wobble hypothesis - correct ans:flexible base pairing in the third
position of the codon. This degeneracy allows for multiple codons encoding
for a specific amino acid
poly U's terminate on which end of RNA?: - correct ans:3'
