1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
andrew-mc [135]
3 years ago
12

Normal cells die in a nutrient medium containing thymidine and methotrexate, whereas mutant cells defective in thymidylate synth

ase survive and grow. The mutant cells grow because the medium contains the___________ they are unable to make normal cells, however, continue to synthesize their own and thereby convert their limited supply of to________ . The methotrexate inhibits , so cannot be regenerated. Without a supply of___________ for the synthesis of nucleotides and amino acids, the cells die.
Biology
1 answer:
Dmitry_Shevchenko [17]3 years ago
7 0

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.

You might be interested in
I´ll give brainliest to the correct and most helpful answer!
IceJOKER [234]
I believe it would be proteins
5 0
3 years ago
Read 2 more answers
Ravi is unable to choose the right career path after completing his college education. He plans to visit a psychologist who migh
weqwewe [10]

Answer:

The correct answer is : false.

Explanation:

The branch of the psychology that deals with human behavior regarding work and work related problems is known as career counseling or vocational psychology, and counselors or specialized in this psychology known as vocational psychologist.

Ravi should visit to the vocational psychologist instead of human factor psychologists. Human factor psychologists deal with daily life factors that affect human behavior such as transportation, work, energy system and many more.

Thus, the correct answer is : false.

8 0
3 years ago
PLEASE HELP ASAP!!!!!!!! BEST ANSWER GETS BRAINLIEST!!!!!!!!!!
Daniel [21]
Three examples would be gamma rays (usually these rays are emitted from unstable isotopes and can be used in nuclear experiments and testing) ultraviolent rays that are emitted from the sun and can cause sunburn and even skin cancer because the rays mutate the DNA in the skin cells nucleus. And also X-Rays, microwaves, and radio waves, which is usually harmless because it isn’t enough radiation to mutate DNA in our cells

I hope this is what you wanted
4 0
3 years ago
Each biological species is genetically isolated from other species. why do the species evolve independently?
Nookie1986 [14]
Species evolve independently possibly due to geographical isolations or behavioural isolations.

Geographical isolation includes the isolation of 2 groups of the same species. Since these 2 groups live in different locations, (e.g. a volcanic eruption resulting in a barrier between one side of an ocean and another side of the ocean), they will have different selection pressures in their different environments as well (e.g. one side of the ocean may have more sunlight and thus more underwater plantations than the other side of the ocean). Natural selection will eliminate those with disadvantageous characteristics (e.g. Fishes that only eat plants and nothing else on the side of the ocean with little plantations) with unfavourable alleles, and select for those with advantageous characteristics (e.g. Fishes are able to eat plants and other organic substances as well on the side of the ocean with little plantations) with favourable alleles.

Since the 2 groups have different selection pressures, natural selection will occur in different ways, selecting for and against different types of fishes with different types of alleles. Also, because of the barrier, they are not able to mate with each other, and there are no mixing of genes from one side of the ocean and the other side. They are genetically isolated. As genetic drift occurs over time, their gene pools become different from each other. Thus, they evolve independently.

Hope this helps! :)
7 0
3 years ago
Every DNA strand has an EQUAL number of adenine and thymine nucleotides in a molecule. Explain why.
FromTheMoon [43]

Answer:

This is the basis for Chargaff's rule; because of their complementarity, there is as much adenine as thymine in a DNA molecule and as much guanine as cytosine. Adenine and thymine are connected by two hydrogen bonds, and cytosine and guanine are connected by three hydrogen bonds

3 0
3 years ago
Other questions:
  • Evaporation is the stage of the water cycle in which liquid water becomes water vapor. On which of the following days would the
    13·1 answer
  • Why do ecosystems constantly need new energy
    12·2 answers
  • What are homologous chromosomes?
    12·1 answer
  • There are five general stages in the family life cycle.<br> a. True<br> b. False
    14·2 answers
  • Which atmospheric layer is least dense? thermosphere stratosphere troposphere mesosphere
    6·1 answer
  • Darwin and wallace independently arrived at the same conclusion that species change over time. which observations supported thei
    14·1 answer
  • This soil structure consists of thin, flat plates of soil that lie horizontally. Usually found in
    12·1 answer
  • Paki andwer and thank you pooowww
    7·1 answer
  • PLEASE HELPPP
    7·1 answer
  • Plzzzz help i will give brainlyest <br><br><br> Write a paragraph describing silverback gorillas
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!