Which biochemical pathway fits the data presented?
Assume that a series of compounds has been discovered in Neurospora. Compounds A–F appear to be intermediates in a biochemical pathway. Conversion of one intermediate to the next is controlled by enzymes that are encoded by genes. Several mutations in these genes have been identified and Neurospora strains 1–4 each contain a single mutation. Strains 1-4 are grown on minimal media supplemented with one of the compounds A-F. The ability of each strain to grow when supplemented with different compounds is shown in the table (+ = growth; o = no growth).
media supplement
A) A ? B ? C ? D ? E ? F
B) A ? B ? C ? F ? D ? E
C) F ? B ? C ? D ? A ? E
D) A ? B ? C ? D ? F ? E
E) A ? B ? F ? E ? C ? D
D) A ? B ? C ? D ? F ? E
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The control in an experiment
a. makes the experiment valid. b. is an additional replicate for statistical purposes. c. reduces the experimental errors. d. minimizes experimental inaccuracy. e. is identical to the experimental group, but eliminates the characteristic or treatment being tested.
The most prominent organelle in most eukaryotic cells, that contains most of its DNA, is the
What will be an ideal response?
What is the structure of the leucine zipper and its target sequence?
What will be an ideal response?
Which of the following statements about thymine dimers is false?
A) Patients with xeroderma pigmentosum have faulty DNA repair mechanisms. B) They are repaired by excision repair. C) They can be produced by exposure to UV light. D) They are repaired by one enzyme that can clip out, lay down new nucleotides, and seal the gap. E) If resulting mutations accumulate, it can result in cancers.