Answer:
d. Estrogen will bind to a receptor protein that enters the nucleus and activates specific genes.
Explanation:
Estrogens are small lipophilic molecules synthesized from cholesterol. This steroid hormone (estrogen) is able to directly enter into the cell nucleus to bind with their corresponding receptors. Subsequently, estrogen-receptor binding stimulates these receptors to form dimeric structures that bind to DNA and thus activate gene expression. Estrogen receptors interact with DNA and activate gene expression through zinc finger domains composed of four (4) cysteine residues surrounding a zinc atom.
Answer:
*Thymidine
*THF to DHF
*THF
Explanation:
Normal cells die in a nutrient medium containing thymidine and methotrexate, whereas mutant cells defective in thymidylate synthase survive and grow. The mutant cells grow because the medium contains the_____Thymidine______ they are unable to make normal cells, however, continue to synthesize their own and thereby convert their limited supply of to__THF to DHF______ . The methotrexate inhibits , so cannot be regenerated. Without a supply of______THF_____ for the synthesis of nucleotides and amino acids, the cells die.
NOTE:
THF means Tetrahydrofolate
DHF means Dihydrofolate
Thymidine which is also reffered to as deoxythymidine, is described as a deoxynucleoside that is composed of the pyrimidine base thymine that is attached to the sugar deoxyribose. Thymidine is a nucleoside made up of pentose sugar, pyrimidine base tymine and deoxyribose, it is one of the the four nucleoside found in exclusively DNA as well as T-loop of tRNA.
Tetrahydrofolate also known as tetrahydrofolic acid can be described as part of folic acid that function as a coenzyme which aid metabolic reactions that includes nucleic acid and amino acids. It is also reffered to as one-carbon metabolism, and it's oone-carbon mechanism is associated to the histidine, serine of amino acid.
Answer:
1) the process of making an RNA copy of a gene sequence.
2)This copy, called a messenger RNA (mRNA) molecule, leaves the cell nucleus and enters the cytoplasm, where it directs the synthesis of the protein, which it encodes.
Explanation:
Answer: Here is the complete sentence: An advantage of a ................................ is that the complete system HAVE SPECIALIZED REGIONS THAT PERFORM SPECIALIZED FUNCTIONS.
Explanation:
The digestive system is a set of organs that work together to break down food molecules into the forms that the body cells can absorb and use. The gastrovascular cavity is an organ of digestion and circulation in some primitive living organisms. Gastrovascular cavity is an unspeciallized organ with two openings, one of the opening is the mouth while the other one is the anus, through which wastes pass out of the body.
The major advantage of complete digestive system over gastrovascular cavity is that the digestive system comprise of specialized organs which perform specialized functions. For instance, the stomach is a specialized organ that is responsible for churning of food during digestion, it also perform other specialized functions.
I think the answer is d but I’m not sure