Answer:
Active Transport
Explanation: it is the movement of dissolved molecules into or out of a cell through the cell membrane.
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Shaping. Each step in the learning process is called an approximation. An animal may be reinforced for each successive approximation toward the final goal of the desired trained behavior. Animals learn complex behaviors through shaping.
In the simulation, the brightness of the guppies is directly related to
how fast they are consumed by predators. This phenomenon is explained
simply and reflects natural selection. The brighter guppies are at a
selective disadvantage due to the ease with which predators are able to
spot them. The darker colored guppies are able to avoid predator better
so they live fore a longer time.
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Answer:
a. The operon is under positive control
a.) Loss of enzyme synthesis results from loss of regulatory R gene product which is regulated in the presence of Tis ophane for transcription. Absence of (Tis), transcription is positively controlled by regulatory Rprotein
b.) The proposed model reveals Tis / B complex prevents Tis enzymes from undergoing transcription through the RB operator by binding to the B region
the role of the R protein is
-decrease affinity of Tis / B complex to B region of RB
-bind to the R region on RB
- change the conformation of B region
- yield decreased affinity of Tis / B complex when R gene is lacking preventing transcription in the process
Effects of the RB mutations is that R protein will not bind to Tis / B complex to reduce transcription
