Answer:
The CRA-cAMP complex increases the rate of expression of lac operon when glucose is absent and lactose is present as nutrient.
Explanation:
CRP is the catabolite gene activator protein that forms a complex with cAMP. The CRP-cAMP complex facilitates the binding of RNA polymerase to the promoter region of the lac operon. This robust binding as stimulated by CRP-cAMP complex is followed by the formation of open complex and initiation of gene expression.
Hence, the CRP-cAMP complex positively regulates the lac operon and increases its expression when glucose is not present.
Explanation:
The giant landmass described by Wegener in his continental drift hypothesis has broken down into different slabs and they have moved to new positions. The giant landmass is called Pangaea. Pangaea is a supercontinent believed to have produced the continents today.
- The break up of the supercontinent started about 175million years ago.
- Today, it is understood that the concept of plate tectonics provides an insight into how the supercontinent have broken down and migrated to their present position today.
- Plate tectonics also provides a mechanism that provided motion for the plate.
- Wegener from his observation suggested that the continent could easily fit into a single supercontinent like the pieces of a puzzle.
- He also suggested evidence from across the various continents to back up his claim.
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Answer:
sympathetic nervous system
Explanation:
The sympathetic nervous system is part of the autonomous nervous system which controls the involuntary body functions as heart rate, breath rate, perspiration etc. The sympathetic nervous system is specifically responsible for the increase in the function of body functions when the body perceives a threat. When faced with a threat or distress, the sympathetic nervous system initiates physiological reactions known as the “fight or flight” response, thereby increasing the body’s alertness to such threat. Examples of increased body functions or “fight or flight response” include increased perspiration and increased heart rate, as exhibited by Blair.
Answer: The human body is organized at different levels, starting with the cell. Cells are organized into tissues, and tissues form organs. Organs are organized into organ systems such as the skeletal and muscular systems
Explanation:
Answer: Option B
Explanation:
A non native species is greatest threat to biodiversity. The species that are not present in the particular place and are introduced in the biodiversity by any means whether it is intentional or unintentional is known as invasive species or non native species.
The non native species of bees is introduced to prey on the fire ants can be a threat to biodiversity as it can use the resources available for the native species.
The effect of the non native species on the native species is not predictable on the species that is already present there.