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The following table shows several bacterial strain lac operon genotypes (some are partial diploids).
a) Fill in the blanks in the “lactose absent” and “lactose present” columns in this table. (+) means significant levels of active ß-galactosidase enzyme can be detected. (–) means no significant levels of active ß-galactosidase enzyme. The first line is filled in for reference.Strain genotypeLactose absentLactose present1. lacI+ lacP+ lacO+ lacZ+ lacY+2. lacI+ lacP+ lacOc lacZ+ lacY+3. lacI+ lacP+ lacOc lacZ– lacY+4. lacIs lacP+ lacOc lacZ+ lacY+5. lacI– lacP+ lacO+ lacZ+ lacY+ / lacI+6. lacIs lacP+ lacO+ lacZ+ lacY+/ lac I+
b) If lactose is absent and glucose is present in the culture medium of strain 4, will significant levels of active ß-galactosidase enzyme be detected? Explain… in brief, just because there is lots of room left, you don’t need to fill it.
Which of these is the largest terrestrial biome on Earth? A) tundra B) coniferous forest C) temperate broadleaf forest D) temperate grassland E) desert.
If an individual was exercising at an exercise intensity of 1.5 liters of oxygen per minute, and had a mechanical efficiency of 20 percent, how many heat Calories would this person generate in 30 minutes?
A 19 year old college student cuts his lower lip while saving and seek medical advice. Physical examination confirms a deeps tissue wound that exhibits the cardinal signs of inflammation. In response to collagen and other basement membrane protein..
What does the cell use NAD+ and NADP+ for? What is the difference between the two? In what types of biological pathways is NAD usually used in? NADP?
Propane boils at -46oC. Propanol boils at 97oC. The difference is attributable to, Determine which of the following pairs of functional groups CANNOT react with each other by a dehydration reaction?
What is the genus and species name for family Stomiidae, Family Paralepididae, Family Gadidae, Family Merluccidae, Family Macrouridae.
Suppose that an enzyme uses a catalytic mechanism in which a functional group on the enzyme has to accept a proton from the intermediate formed in the first chemical step
Compared with the normal region of DNA, what unique characteristic does the DNA replication origin have?
You study Gene Y in Drosophila. You want to compare the mRNA level of Gene Y in a mutant and in a wild type fly. What kind of test would you use?
Which of the following should NOT be expected to cause a change in the frequencies of alleles in a population?
A three-factor cross in Salmonella typhimurium was performed using bacteriophage P22. The cross was between an arg-leu-his- recipient bacterium and bacteriophage P22, which was grown on an arg+leu+his+ strain.
Explain how the two different kinds of mountains are formed by plate movement. Be sure to mention how the density of the plates affects what kind of mountains form.
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