1.
Which blood type would not be possible for children of a type AB mother and a type A father?
A
O
B
A
C
B
D
AB
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Which blood type would not be possible for children of a type AB mother and a type A father?
O
A
B
AB
In addition of histone protein chromatin contains an approximately equal mass of a wide variety of
Non-histone protein
RNA
Positive charge protein
Unknown protein
Histone four (H4) consists of 102 aminoacids and it has
Negative charge
Positive charge
Neutral
None of these
The most common form of severely affected people who are havingmore than 1000 repeats of the CTG triplet are called
Myotonic dystrophy
Fragile X syndrome
Retinoblastoma
If you performed a laboratory analysis of DNA, you would find that the amount of adenine is ____________ the amount of thymine.
much greater than
much less than
about the same as
shows no relationship
A ______ made inside the nucleus of a cell, associates with proteins to form ribosomes.
mRNA
rRNA
tRNA
All of the above
When cancer cells gain the ability to move independently and invade other tissues, they are said to have:
Mobilized.
Evolved.
Metastasized.
Metamorphed.
Which of the following descriptions of chromosomes is not correctly matched?
Metacentric chromosome arms are almost equal in size.
Submetacentric chromosome arms are slightly different in size.
Acrocentric chromosome arms are identical in size.
Telocentric there is only one chromosome arm.
Carriers of the colour-blindness trait include:
Men who are heterozygous for the trait.
Men who are homozygous for the trait.
Women who are heterozygous for the trait.
Women who are homozygous for the trait.
The X - ray diffraction studies conducted by ______ were key to the discovery of the structure of DNA
McClintock
Franklin
Meselson and Stahl
Chargaff
Which of the following is correct with regard to aneuploidy?
Inversion
2n + 1
All aneuploid individuals die before birth
4n
Chromosomes measurements are generally taken during
Interphase
Prophase
Anaphase
None of these
Those mutations that arise in the absence of known mutagen are known
Induced mutations
Fused mutations
Spontaneous mutations
None of the above
______ portions of chromosomes that stain lightly andonly partially condensed
Heterochromatin
Euchromatin
Facultative chromatin
Constitutive
The triplet code of CAT in DNA is represented as ______ in mRNA and ______ in tRNA.
GAA, CAT
CAT, CAT
GUA, CAU
GTA, CAU
A gene is a section of DNA that codes for a protein, this unique sequence of bases will code for the production of a unique protein is:
Exon
Intron
Regulatory sequence
None of these
Changes in the nucleotide sequence of DNA which arent passed to offspring occur in
Eggs & sperm cells
Non-sexual cells
Diploid and haploid cells
All of the above
The enzyme which builds a mRNA strand complimentary to the DNA transcription unit is called:
DNA polymerase
RNA polymerase
Helicase
DNA ligase
Which of the following factors could lead to variations in the offspring of asexually reproducing organisms?
Crossing over.
Fertilization.
Mutations.
Independent assortment.
Proto-oncogene in normal cells
Code for proteins involved in the stimulus of cell division
Suppresses progression through the cell cycle in response to DNA damage
Initiates apoptosis
None of the above