Answer:
C. Enhancer
Explanation:
The enhancer is a regulatory DNA sequence that might be located thousands of nucleotide away from the transcription start site of a gene.
Answer: Radiometric dating
Explanation: Radiometric dating is a procedure used to determine the age of elements such as rocks and fossils. It is based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates.
Answer:
The answers to the blank spaces are numbered as follows:
1. Function
2. Nucleus
3. Mitochondria
4. ATP
5. Chloroplast
6. Glucose
7. Ribosomes
Explanation:
This question is describing the organelles found in a cell. An organelle is a structure that performs a specific FUNCTION (1) in a cell. There are different kinds of organelles with each possessing its own peculiar function. Some of them are as follows:
- NUCLEUS, which is regarded as the brain of a cell because it directs or controls a cell's activities just like the brain of an organism does.
- MITOCHONDRIA is an organelle that produces the energy storing compound called ATP (adenosine triphosphate), hence, it is called power house of the cell.
- CHLOROPLAST is an organelle found in plant cells that functions in the conversion of light energy (from sun) into GLUCOSE (chemical energy) in a process called PHOTOSYNTHESIS.
- RIBOSOMES is an organelle found in both prokaryotic and eukaryotic cells that serves as the site of PROTEIN production in a cell.
<span>In a neuron, the dendrite is the part that receives the signal and sends the message to the cell body. The signal may come from a sensory receptor or from the axon of another neuron or set of neurons.</span>
The four main phases of mitosis are:
Prophase- In the first half:The chromosomes start to shrink. The cytoskeleton begins to form the mitotic spindle, which will grow between the centrosomes and organize the chromosomes.The nucleolus goes away.
In the second half: The chromosomes become extremely compact. The nuclear envelope disappears and all the DNA comes out. Some of the mitotic spindle starts to catch chromosomes.
Metaphase- The mitotic spindle moves all of the chromosomes across the middle of the cell.
Anaphase- The two chromatids of each chromosome are pulled apart from each other and become their own chromosomes. Loose microtubules push the ends of the cell to make it longer.
Telophase- The mitotic spindle is broken back down into microtubules. Two new nuclei appear (one for each new cell). The chromosomes return to their normal form (not all squished down).
Another big step is cytokinesis, which starts either during Anaphase, or Telophase. In animal cells, the cell is pinched around the middle to create the two new cells. In plant cells, a cell plate comes into the middle of the cell and separates it into the two new cells.
The main four steps can be remembered using the acronym PMAT.
