Control of the lac operon and lactose utilization in bacteria is  

_____  not induced in the presence of both glucose and lactose.
_____  only induced when there is glucose but not lactose.
_____  is a negative control, mediated by a repressor.
_____  controlled by the expression of three downstream genes.
_____  preferentially utilizing lactose as a carbon source.


__X__  not induced in the presence of both glucose and lactose.
_____  only induced when there is glucose but not lactose.
__X__  is a negative control, mediated by a repressor.
__X__  controlled by the expression of three downstream genes.
_____  preferentially utilizing lactose as a carbon source.

Biology & Microbiology

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If one of Mendel's genes had three alleles that differentially affected the phenotype rather than two, what would he have observed among the progeny of many crosses between all pairs of the three pure-breeding lines in the F1 and F2 generations?

Comments: This case brings up the chance of codominance or incomplete dominance and provides for multiple phenotypes among a large set of crosses. In any one cross, there would be specific pure-breeding strains used, but there could be white, pink, and red flowers that are all pure breeding that may have complete or incomplete dominance. The population effects of this kind of genetics could move toward a broader range of phenotypes leading to the idea of blending inheritance. Mendel's innovative idea was to narrow the traits to simple binary phenotypes. This complication could show what could happen if he had not been so thoughtful. A. In each of the crosses, two phenotypes in the F1 generation. B. Only a single phenotype would be observed in the F1 generation because only one allele can be dominant. C. No evidence would exist for the law of segregation. D. No pure breeding plants produced in the F2. E. None of the responses are correct.

Biology & Microbiology

Antigens in vaccines are mixed with an adjuvant to enhance the rate and degree of immunization.

Answer the following statement true (T) or false (F)

Biology & Microbiology

Protection against abrasion, barrier against infection

What will be an ideal response?

Biology & Microbiology

Which of the following will not reduce dietary lipids?

A. cooking with butter instead of herbs and spices B. removing skin from poultry C. avoiding packaged foods that contain hydrogenated fats D. broiling rather than frying E. using lemon juice instead of salad dressing

Biology & Microbiology