21.
During cell division there are three types of check points one of them (M checkpoint) to ensure
A
Chromosomes are attachedto the spindle
B
Complete DNA replication
C
DNA not damage or broken
D
All of the above
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During cell division there are three types of check points one of them (M checkpoint) to ensure
Chromosomes are attachedto the spindle
Complete DNA replication
DNA not damage or broken
All of the above
Those cancers that derived from ectoderm or endoderm of epithelial cell are called
Carcinoma
Sarcoma
Leukaemia
Myeloid
Why is sickle cell disease so called?
because it makes people sick
its named after a special type of white blood cell
pH changes in the blood cells make them collapse into a sickle shape
because its caused by an infectious microorganism that has sickle shaped cells
Those mutations that occur by environmental damage or mistakes during DNA replications are
A and B
None of these
Acquired mutations
Inherited mutations
Which of the following is not true of DNA?
The double helix is 2.0 nm wide
The double helix is 3.4 nm wide
A pairs with T and G pairs with C
Nitrogen bases are 0.34 nm apart on a DNA strand
Which of the following may contribute to causing cancer?
loss of control over telomere length
all of the above
a mutation in a gene that slows the cell cycle
faulty DNA repair
Which of the following is correct?
A forms 2 covalent bonds with T; G forms 3 covalent bonds with C
A forms 2 hydrogen bonds with T; G forms 3 hydrogen bonds with C
A forms 2 hydrogen bonds with G; T forms 3 hydrogen bonds with C
A forms 3 hydrogen bonds with T; G forms 2 hydrogen bonds with C
The cytoplasm of an animal cell is divided by means of:
A cell membrane formed within the cytoplasm.
Mitosis.
A cleavage furrow.
A cell plate.
Normal human eggs have
23 autosomes.
46 chromosomes.
22 autosomes and an X chromosome.
22 autosomes and a Y chromosome.
Cancer cells are
Avoidance of cell death
All of the above
Unlimited number of cell divisions
Growth without external signals
Proteins that assist the binding of RNA polymerase to the promoter region on DNA strand are called
Sigma factor
All of the above
Transcription factor
SSB protein
A heritable feature is a ______ and may have two or more variants called
character/factors
trait/factors
trait/characteristics
character/traits
BRCA-1 is associated with which cancer?
Lung
None of the above
Thyroid
Leukemia
A pedigree chart shows:
The pattern of inheritance of a specific gene.
Which genes are co-dominant.
The genotypic ratios of the offspring.
The types of gametes produced by the parents.
Which of the following is not needed for DNA transcription?
DNA
Enzymes
Ribosomes
Nucleotides
______ is a genetic changes that occur in more than 1 percent of the population
Frameshift mutation
Polymorphisms
Monotheism
What are the repeating units of nucleic acids?
bases
sugar molecules
phosphate molecules
nucleotides
Proteins are made of amino acids linked together by specific bonds called
Hydrogen bonds
Hydrogen & Nitrogen bonds
Peptide bonds
Nitrogen bonds