The correct answers are as follows:
1. A.
There are basically two types of succession, they are primary and secondary succession. Primary succession refers to the type of succession that occurs in new and bare areas where the soil present is unable to sustain the growth of plants. An example of primary succession area is an area with sand dunes that is freshly formed. Primary succession usually occur over a long period of time. Secondary succession is a type of succession that occur on a land which was disturbed by hazardous events such as fire outbreak, flood, etc. Secondary succession occurs much faster than the primary succession.
2. D
There are two types of factors that affect any particular ecosystem, these are abiotic and biotic factors. The abiotic factors refers to non living factors such as temperature, relative humidity, rainfall, etc. while the biotic factors refer to the living factors. Looking at the options given above, one will see that only option D has living factor, which is predators. All other options have abiotic factors.
The answer to the question "Upon realizing that your remote is not working even after replacing the batteries you decided to use, this process is called the experiment. You are experimenting on what would happen to the remote if you are going to change the batteries, if it is going to work or not.
Answer:
In eukaryotic cells you find core and proximal promoters.
Promotors are specific DNA sequences where transcription factors (proteins) and RNA polymerase binds to initiate transcription. Promotors are located upstream the coding sequence
Core promoters are where RNA polymersae binds and proximal promoters are where transcription factors bind.
Enhancer elements are DNA sequences where transcription factors (proteins) bind to increase the rate of expresion of an specific gene. Enhancers can be located either upstream, downstream or thousands of nucleotids away from the of the coding region.
Explanation:
Promoters and enhancer are key elements for controling gene regulation. Transcription begins when chromatin rearranges from a condensed state to a accesible state, this allow to transcrition factors and RNA polymerase to bind specif DNA sequences (promotors). Proteins bind to enhancers , this complex develops a DNA loop, so that the protein that is bound to the enhancer interacts with the RNA polymersase. When this interaction is made, the activity of the RNA polymerase is increased.
I don’t really understand this question can you go more into detail
There are two ways to do this. You could actually learn the phases and count each one. Since you're posting here, it's a safe bet you have no intention of actually learning the material. The second is to estimate based on the total number of cells. At any given time, you will have approximately the following percentages for each phase of the cell cycle:
Interphase - 96%
Prophase - 2.5%
Metaphase - .5%
Anaphase - .5%
Telophase - .5%
In the picture, there are about 120 cells. Now you have to do a little 5th grade math to calculate the approximate mumbers of each phase. So, for Interphase, we multiply 120 x .96 = 115. For Prophase we multiply 120 x .025 = 3. For Metaphase, Anaphase, and Telophase, we multiply 120 x .005 = .6, which rounds up to 1 each. Now, as I specified, these numbers are approximate. Looking at the picture, I count three that are in Metaphase, two that are in Anaphase, and at least three in Telophase. And there are more than three in Prophase. The best way to figure this out is to print the picture and, using a guide from the internet, count the cells in each phase, marking them off as you count them so that you don't recount them. Good Luck!
