The haploid number in human is ___, while the diploid number is ___.
Answer: 23, 46
Question 2
Which of the following is correct?
Sister chromatids are held together by cohesion.
Chromosome bodies are responsible for the formation of spindle fibers.
In metaphase, centromeres are dispersed throughout the nucleus.
All are correct.
Question 3
True or False: Genetic information can be transferred between bacteria on a
single-stranded RNA molecule called a plasmid.
False.
Question 4
True or False: A chromosomal aberration is an alteration to the chromosome
that results in a change to the total number of chromosomes, deletions or
additions to the chromosome, or even complete rearrangement of
chromosomal segments.
True.
Question 5
True or False: Most scientists believe that the biggest driver of a cancer
phenotype is the ability of cancer cells to avoid apoptosis.
False
, Question 6
Explain briefly how the idea of epigenesis and preformation directly
contradict each other.
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.
Question 7
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.
Question 8
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.
Answer: phage, sheath
Question 9
The only trisomy disorder in which individuals routinely live longer than one
year is ___. The incidence of this disorder seems to increase with maternal
___.
Down syndrome (or trisomy 21); age
Down syndrome; health
Cystic fibrosis; age
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