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Bio Help, Please!!!!!?

Melanoma and Skin Cancer Discussion

Bio Help, Please!!!!!?

Postby rhys » Sat Dec 17, 2011 1:01 am

14. While mRNA strands are being created, a sequence is sometimes miscopied. What is the worst that could happen to a cell should this take place? (2 points)The cell will die once it tries to use that strand of mRNA.
The cell will have to destroy any ribosomes that use the mRNA strand.
The cell will not make functional proteins from that mRNA strand.
The cell will pass the mRNA mutation on to all the cells made from it.

15. Which genetic mutation would cause the most dramatic change in the genetic make-up of an individual? (2 points)a base-pair substitution mutation where one base pair becomes another, but codes for the same amino acid
a gene mutation that inserts one extra base pair into the genetic sequence
a mutation that deletes three consecutive base pairs from the genetic material
a single point mutation that changes the codon for a different amino acid

16. A person with the genetic disorder Klinefelter's syndrome has an extra X-chromosome. Affected individuals have the genotype XXY. What can you infer is most likely the genetic mutation that results in Klinefelter's syndrome? (2 points)complete duplication of chromosomes during polyploidy
crossing over during meiosis
nondisjunction during meiosis
translocation during genetic replication

17. The fundamental explanation for the cause of cancer is that (2 points)a recessive genetic disorder is expressed in both alleles.
cells no longer replicate and become nonfunctioning.
cell replication becomes uncontrolled.
viral or bacterial antigens infect a body that cannot destroy them.

18. Which genetic mutation will result in a change in phenotype expression? (2 points)a mutation in a body cell that is dominant for the trait
a mutation in a body cell that is heterozygous for the trait
a mutation in a body cell that is homozygous for the trait
a mutation occurring in any muscle or skin cell

19. Recently, some crop plants have been genetically modified to be immune to the effects of weed killers. Which of the following should be determined before planting the resistant crop in fields? (2 points)Could the gene for resistance negatively affect the genetic diversity of the crop itself?
Could the gene for resistance be passed on to subsequent generations of crops?
Could the gene for resistance increase the yields of the crop as compared to unmodified varieties?
Could the gene for resistance to weed killers pass naturally from the crop plants to weeds?

20. Hemophilia is an x-linked recessive disease. Under which of the following conditions will a female child inherit hemophilia? (2 points)Both parents must have the hemophilia allele.
Both sets of grandparents must have the hemophilia allele.
Only the father must have the hemophilia allele.
Only the mother must have the hemophilia allele.

21. Andrea works in an office where frequent outbreaks of colds and viruses occur. However, Andrea stays healthy most of the time and rarely misses work. Which is the most likely explanation for Andrea's health in this environment? (2 points)She has probably already had all the strains of colds and viruses in her office.
She has probably been taking vitamins and her co-workers have not.
She probably washes her hands frequently and avoids touching her nose or mouth.
She probably inherited immunity to most colds and viruses from her parents
rhys
 
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