The question is incomplete as it does not have the options which are:
By binding to a plasma membrane receptor it initiates a cascade.
It relays a signal from the cytoplasm to the plasma membrane.
It activates relay proteins.
By binding to DNA it triggers the transcription of a specific gene.
It is a plasma membrane protein that binds signal molecules.
Answer:
By binding to DNA it triggers the transcription of a specific gene
Explanation:
The transcription factors are the protein molecules that bind with a specific sequence of the DNA. These transcription factors after binding to DNA initiates the process of transcription thus act in gene expression.
The transcription factors are involved in the long transduction pathway which has to act on the DNA sequence and produce the enzymes like involved in the synthesis of steroid hormones in the body.
Thus, the selected option is correct.
Answer:
4: DNA is found in the nucleus of the cell
5: cell
6: A person has 23 pairs of chromosomes
7: Chromosomes, genes, DNA are different names for different parts of THE SAME thing
8: the genes that determine what you look like came from your PARENTS
9: the reproductive cells called SPERM AND EGGS each contain only 1/2 of the genes needed to make a person
10: All living things have the same genetic CODE
11: ATCG combine in different patterns to form different CHEMICALS
12: Each species has a different BLUEPRINT, but the same kind of DNA molecule
13: A(n) HORSE has 64 chromosomes
14: A chromosome can only be seen by using a MICROSCOPE
A chemical change must have occurred in investigation B step 2 because a change in color occurred.
<h3>What is a chemical change?</h3>
A chemical change is said to occur when a new substance has been formed. The markers of the occurrence of a chemical change are signs such as;
- Evolution of a gas
- Appearance of a solid
- Change of color
- Change of temperature
Now a physical change does not involve the formation of a new substance. Physical change would always involve the change of a substance from one form to another such as the melting of ice.
As such, in looking our for the steps in which a chemical change occurred we must look out for the properties of a chemical change as mentioned above.
Now, a chemical change must have occurred in investigation B step 2 because a change in color occurred.
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Missing parts;
Investigations were carried out in a science lab to explore the topic of chemical and physical changes. Investigation A Step 1. Add 5 tsp. salt to 100 ml warm water and stir until most or all of the salt is no longer visible. Step 2. Heat the salt solution on a burner until only a white solid remains. Investigation B Step 1. Mix 10 tsp. white sugar into 100 ml water and stir until most or all of the sugar is no longer visible. Step 2. Heat the sugar solution on a burner until the solution thickens and turns brown. In which step(s) did a chemical change most likely occur?