The depicted region contains two genes (cI and cro) and three promoters (PR, PL, and PRM), these promoters are direct the transcription such as;

a) PR and PL are is a weak promoter and only directs efficient transcription when an activator is bound just upstream

b) PR and PL are strong, constitutive promoters, they bind RNA polymerase efficiently and direct transcription without     help from an activator

c) PRM, is a weak promoter and only directs efficient transcription when an activator is bound just upstream

d) PRM are strong, constitutive promoters, they bind RNA polymerase efficiently and direct transcription without help from an activator

Which of the following from the above combination is correct ?

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#Question id: 18781

#Unit 13. Methods in Biology

In which of the following case a large lattice is formed?

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#Question id: 12457

#Unit 10. Ecological Principles

A _______________ survivorship curve is most typical of an opportunistic species.

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#Question id: 1084

#Unit 4. Cell Communication and Cell Signaling

Which observation suggested to Sutherland the involvement of a second messenger in epinephrine's effect on liver cells?

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#Question id: 10967

#Unit 7. System Physiology – Animal

A 21-year-old female, blood type B, is undergoing surgery. Her platelet count is 75,000/μl. She will need platelet infusions before and during surgery. Which of the following blood types would be used to collect platelets that are compatible with the patient?

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#Question id: 10358

#Unit 6. System Physiology – Plant

Which of the following essential micronutrients is associated with nitrate reductase enzyme found in higher plants?