The lactose operon is likely to be transcribed when ____. a) There is more jocos
ID: 300179 • Letter: T
Question
The lactose operon is likely to be transcribed when ____. a) There is more jocose in the cell than lactose b) There in high glucose and lactose concentrations in the cell c) There is glucose but no lactose level in the cell d) The cAMP level is high and the lactose level is low e) The cyclic AMP and lactose levels are both high within the cell Frank Griffith's experiments using 2 strains of a bacterium (S. Pneumonia) demonstrated the phenomenon of: a. Transduction b. Conjugation c. Infection d. Transformation e. Nondisjunction Crossing a homozygous recessive with a homozygous dominant individual (for a single trait), what is the probability that an F1 offspring will have a dominant phenotype? a. 0% b. 25% c. 50% d. 75% c. 100% If the 2 alleles at a locus differ, then a. The dominant allele has no noticeable effect on appearance b. The recessive allele determines the organisms appearance c. The dominant allele determines the organism's appearance d. both allele determine the organisms appearance e. All of the above The following is a map of four genes on a chromosome. Between which two genes would you expect the highest frequency of recombination? a. A and G b. E and G c. A and E d. W and E e. A and W The genetic code is essentially the same for all organisms. From this, one can logically Assume which of the following? a. DNA was the first genetic material b. A gene from an organism can theoretically be expressed by any other organism. c. The same codons in different organisms translate into different amino acids. d. Different organisms have different types of amino acids. e. There are more than two similar genes for the same traitExplanation / Answer
12. e. the cAMP and lcatose are both high with in the cell.
In the absence of glucose, the CAP binds to the promoter region and promotes transcription. cAMP enables the CAP prote. The cAMP levels are high in the absence of glucose. Catabolite activator protein (CAP), acts as a glucose sensor. The lactose operon is transcribed in the absence of glucose and in the presence of lactose.
13. d Transformation.
Griffith's experiment discovered "transforming principle". He used two strains of pneumococcus (Streptococcus pneumoniae) bacteria.
14. e 100%
15 .c the dominant allele, determines the organism’s appearance
the recessive allele has no effect on the organisms appearance.
16 a A-G
The highest frequency of recombination for a pair of traits, the greater the distance separating the two loci.
17 b.. A gene from an organism can theoretically be expressed by any other organism.
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