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A regulator gene-minus strain of E. coli is constitutive for expression of the lac-operon because the repressor cannot bind tothe operator region even when lactose is present. By bacterialconjugation, it is possible to introduce into the regulator-minusstrain a wild type or regulator-plus gene, which can betranscribed.What effect does lactose have on expression of the lac-operon in the bacteria containing both types of regulator genes? Explain youranswer.
q1. while muscle cells undergo anaerobic respiration they become fatigued and painful. it was once believed lactic acid
Which of the following best describes the process of gas exchange in insects?
Explain the main types of extracellular signaling.
Cells have internal signals that stop or start cell division, but there are also three main types of external signals. State all three with a brief explanation of what they are
A feature detector in the visual cortex is most likely to answer which of these questions?
In the progress of performing an experiment, we find that (briefly) washing cells in a buffered solution at pH 3 is effective for isolating a cell membrane associated hormone receptor. (A std growth soln for the cells is usually pH 7).
What kind of microorganism is selected for on the SAB plate and the 3M Petrifilm?
q. the peppered moth provides a well-known example of natural selection. the light-coloured form of the moth was
Which of the followingis (are) considered to be evidence that species are related?
Explain the cardiac cycle beginning with atrial systole. Include what happens during all of the steps, including atrial systole and diastole, and ventricular systole and diastole.
q1. which condition is best described while the ovaries shut down their production of eggs and hormones like estrogens
Discuss the difference and similarities between mosses fern and gymnosperms to their life cycle? and how did they adapt to a land environment?
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