Exam 1 Flashcards

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1
Q

Alkaptonuria is a disorder in which the body cannot process phenylalanine and tyrosine, this is caused by a mutation in HGD gene for what enzyme?

A

Homogenisate 1,2-dioxygenase

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2
Q

What is responsible for the strong negative charge of nucleic acids?

A

The phosphate group

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3
Q

As the parental double helix divides into two double helix DNA with one parental strand in each of the double helices, what is this known as?

A

Semiconservative replication of DNA

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4
Q

What DNA is very long and has multiple origins of replication?

A

Eukaryotic DNA

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5
Q

Helix destabilizing proteins, keeps the two DNA strands separate and protects the DNA from Nucleases that cleave single stranded DNA, what is another name for Helix destabilizing proteins…

A

Single stranded DNA binding proteins (SSB)

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6
Q

Pictures of kids…

A

The fat kid is the answer, something to do with Prader-willi syndrome or something

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7
Q

DNA polymerase III has what type of polymerase activity?

A

5’ –> 3’

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8
Q

What type of activity is used to excise mismatched nucleotides during proofreading of newly synthesized DNA?

A

3’ –> 5’ exonuclease activity

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9
Q

DNA Polymerase I uses what nuclease activity for RNA primers (replacing RNA with DNA), it synthesizes the new DNA and then proofreads the new chain using what exonuclease activity?

A

5’ –> 3’

3’ –> 5’

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10
Q

What is a multisubunit enzyme used during eukaryotic DNA replication to initiate strand synthesis on the leading strand and beginning of okazaki fragments of the lagging strand?

A

Pol Alpha

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11
Q

What does not require a primer and has no known endonucleases or exonuclease activity, therefore has no ability to repair mismatch…

A

RNA polymerase

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12
Q

What does require a primer and has endonucleases and exonuclease activity?

A

DNA polymerase

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13
Q

What is an enzyme that produces the small RNA’s including tRNAs and small ribosomal RNA?

A

RNA Polymerase III

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14
Q

When genetic code is redundant where some amino acids have more than one triplet coding for it?

A

Degeneracy

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15
Q

Huntington disease…

A

Autosomal Dominant

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16
Q

Galactosemia…

A

Autosomal Recessive

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17
Q

KNOW autosomal dominant inheritance pedigree works…

A

Normal parent with Heterozygote –> 50% probability that child will get either affected or normal gene

18
Q

Causation of the same disease phenotype by mutations at different loci

A

Locus heterogeneity

19
Q

What is the differential activation of genes, depending on the parent from which they are inherited. EX. mutation on long arm of chromosome 15 from father = prader-willi syndrome, from mother = angleman syndrome

A

Genomic imprinting

20
Q

There was a long codon on the test, had to match it up with other codons…

A

The codon on the test starts with U. Make sure to know how start and stop codons work!

21
Q

What enzyme is defective when cancer keeps growing….

A

Telomerase

22
Q

RNA polymerase III

A

tRNA

23
Q

This trisomy produces Patau Syndrome…

A

Trisomy 13

24
Q

Friedreich Ataxia…

A

(GAA triplet) (intron) - site of expansion and affected sequence caused by nucleotide repeat mutation = AUTOSOMAL RECESSIVE

25
Q

What trisomy has an incidence of 1 in 800 live births?

A

Trisomy 21

26
Q

Picture of a down syndrome child…

A

Trisomy 21

27
Q

What trisomy produces Edward syndrome and is the most common chromosome abnormality among still-borns…

A

Trisomy 18

28
Q

What trisomy is associated with Klinefelter Syndrome?

A

Trisomy XXY (Karyotype 47)

29
Q

Sometimes a chromosome divides along the axis perpendicular to its usual axis of division resulting in a chromosome that has two copies of one arm and no copies of the other… What is this called?

A

Isochromosomes

30
Q

Isochromosomes split in what way?

A

Horizontally, not vertically

31
Q

Most isochromosomes observed at live births involve the X chromosome and usually have features of what genetic disorder?

A

Turner syndrome

32
Q

Difference between DNA and RNA?

A

RNA has no exonucleases or endonucleases

33
Q

What is the most common inherited cause of mental retardation - the X exhibits breaks and gaps near the tip of the long arm. (Down syndrome is a chromosomal abnormality and NOT an inherited GENE mutation)

A

Fragile X Syndrome

34
Q

When permutations tend to become larger in successive generations is known as what?

A

Sherman paradox

35
Q

Kearns-Sayer syndrome is what?

A

Mitochondrial inheritance disease

36
Q

Familial Hypercholesterolemia is what?

A

Autosomal dominant

37
Q

Hemophilia A….

A

X-linked recessive

38
Q

What results in La Von Gierke Disease (GSD I) in the Liver?

A

Glucose-6-phosphatase defect

39
Q

What is the most prevalent amino acid metabolism disorder?

A

Phenylketonuria (PKU)

40
Q

What disease results from deficiency in Branched-Chain a-ketoacid dehydrogenase…

A

Maple syrup urine disease

41
Q

Xeroderma pigmentosum (XP) groups A-G

A

Skin cancer, cellular UV sensitivity, neurological abnormalities