Describe some of the advantages of segmentation
What will be an ideal response?
ANSWER: Segmentation allows for flexibility of movement. Segmentation improves control over
movement because segments can act independently. Different segments can contain
different, and in many cases, a complete set of organs. Therefore, segments can be severely
damaged without the entire organism being damaged or killed.
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Operons
1.are groups of genes in bacteria under control of a common promoter. 2.are transcribed into a polycistronic mRNA. 3.allow common regulation of genes. 4.are usually comprised of genes involved in a particular function. 5.All the options are correct.
A deterioration in the myelin sheaths of motor axons to the lower leg would be expected to
a. remove the restraints to ion movement and speed up impulse transmission. b. cause immobility of the leg due to cessation of impulses to leg muscles. c. slow the rate of transmission and cause lack of motor control. d. have little effect because the sheaths are for insulation only. e. cause paralysis.
Which of the following is not an advantage of molecular phylogenetics as compared to morphological phylogenetic methods?
A. A single gene can provide a lot of information B. Nucleotide sequences are clearly delineated, so unlike morphological characters, are unambiguous C. Molecular data is easy to use in mathematics and statists D. It doesn't require any specialized equipment
The main underlying mutation seen in nearly all Burkitt's Lymphoma tumors is
a) Deletion of the immunoglobulin heavy chain gene leading to a compromised immune system b) A translocation that results in Src being localized improperly to certain regions of the cell c) Truncation of the on/off regulatory peptide domain of Abl d) Over expression of the transcription factor Myc