imagine that a pharmaceutical company was successful at producing a drug based on the ccr5 gene product that is effective at preventing the contraction of aids. however, shortly after the drug has been in use, patients and doctors report that the drug is not as effective as it once was. what is the most likely explanation for this result?
Answers
After the drug has been in use, patients and doctors report that the drug is not as effective as it once was, the most likely explanation for this result is (D) Some HIV viruses have genetic variations in the RNA genome that provide resistance to the actions of the drug.
It is not always the case that a person who has been exposed to the HIV virus will eventually get AIDS. Some individuals have a natural defense against HIV infection due to their genetic makeup. Dr. Stephen O'Brien, a researcher at the National Cancer Institute in the United States, has just discovered a variant of the gene known as CCR5 gene known as a mutant that can defend against HIV infection. It's likely that the mutation first appeared in Europe, where it then spread via populations of people who had survived the bubonic plague. Plague germs are unable to enter and infect body cells because a defective gene stops them from connecting to the cellular membranes and, as a result, from entering the body. So the correct option is (D).
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Related Questions
As sound waves travel through air, they cause air molecules to do what?
Answers
Answer:
To vibrate
Explanation:
When sound waves travel, they need to form vibrations so the air molecules vibrate
Archaebacteria and eubacteria are classified into different kingdoms, but at one time they were both classified in the Kingdom Monera. Which statement best describes why the classification of these organisms was changed?
A. The kingdom became too large and had to be made into two smaller kingdoms.
B. New biochemical data showed different evolutionary relationships within the kingdom
C. The archeabacteria and eubacteria habitats were too different to be classified in the same kingdom.
D. Chromosomal analyses indicated a new genetic combination had arisen within a certain organisms in the kingdom.
Answers
Answer:
I think the option C is correct
The statement best describes the classification of these organisms was changed is the archeabacteria and eubacteria habitats were too different to be classified in the same kingdom.
What are the characteristics of Archaebacteria?Archaea is a domain of single-celled organisms. These microorganisms lack cell nuclei and are therefore prokaryotes. Archaea were initially classified as bacteria, receiving the name archaebacteria.
Archaeal cells have unique properties separating them from the other two domains, Bacteria and Eukaryota. Archaea are further divided into multiple recognized phyla. Classification is difficult because most have not been isolated in a laboratory and have been detected only by their gene sequences.
The common characteristics of Archaebacteria known to date are these: (1) the presence of characteristic tRNAs and ribosomal RNAs; (2) the absence of peptidoglycan cell walls, with in many cases, replacement by a largely proteinaceous coat.
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which came first the chicken or the egg (this is for a school asignment i promise)
Answers
Answer:
fs the chicken
Explanation:
Answer:
two birds that weren't really chickens created a chicken egg, and hence, we have an answer: The egg came first, and then it hatched a chicken.
Explanation:
The opening in leaves necessary for photosynthesis is call the
Answers
Answer:
I kinda think it's stomata
How does energy transfer from the hot water to the cold air
Answers
Answer:
humidity and evaporation
Explanation:
Which of the following describes the function of genomics and marker-assisted selection?
A. help determine the heritability of a trait and eliminate undesirable traits
B. introduce probiotics and the transfer of microorganisms from other species
C. eliminate undesirable traits and improve desirable traits
D. improve desirable traits and help determine the heritability of a trait
Answers
Answer:
D
Explanation:
Improve desirable traits and help determine the heritability of a trait.
Complete the table below showing the sequences of DNA, mRNA codons, tRNA anticodons and the amino acids. Remember the genetic code is based on mRNA codons. (il give you brain list if you answer all)
Answers
Answer:
1. TGG 2.TTC 3.ATA 4. ACC 5. AAG 6. CUA
Explanation:
7. UGG 8. GAU 9. AUA 10. phenylalanine 11. aspartate 12. isoleucine
During translation, tRNA adds the correct amino acid to the growing protein, following the mRNA codon sequence. Tryptophan, Lysine, Leucine, Tyrosine.
What is translation?Translation is the stage in protein synthesis that follows transcription, and occurs in the cytoplasm.
When mRNA leaves the nucleus and moves to the cytoplasm, it meets a free ribosome that is the primary structure for protein synthesis. Ribosomes are composed of two subunits of rRNA associated with different tRNA that carries amino acids.
The ribosome reads mRNA in the 5' to 3' direction, and, according to the codons that are being readen in mRNA, tRNA transfers the correct amino acids to build the polypeptide chain.
Let us remember that the codon is the sequence of three nucleotides present in mRNA. The molecule carriesa a start codon and stop codons.
Each tRNA has two important sites. One of them is the antidocon that couples with the codon of the mRNA molecule. The other site couples with the coded amino acid.
The protein is synthesized from the amino terminus to the carboxy terminus.
In the example,
DNA mRNA tRNA Amino Acid
ACC UGG ACC Tryptophan
TTC AAG UUC Lysine
GAT CUA GAU Leucine
ATA UAU AUA Tyrosine
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An informational pamphlet in a health clinic describes an interaction between body systems.
5
An ovum moves from an ovary into the
uterine tube where its migration toward
the uterus is aided by the peristaltic
contractions of the smooth tissues of the
uterine tube's walls
6
7
Which statement identifies the body systems that are directly involved in the interaction
described and explains how they accomplish the interaction?
00
A The nervous system produces hormones that stimulate the ovum, and the circulatory
system moves the ovum into the uterine tube.
9
B The circulatory system supplies the uterine wall with oxygenated blood, and the
immune system prevents damage to the ovum. -
C The reproductive system produces the ovum, and the muscular system causes the
migration of the ovum by peristaltic contractions.
10
D The excretory system expels the ovum from the ovary, and the nervous system causes
the contractions of the smooth tissues of the uterine wall.
Answers
Answer: c
Explanation:
Answer:C
Explanation: its c
Given that cellular respiration uses oxygen and produces carbon dioxide which of the following statements can be inferred from the diagram shown above? Animals participate in cellular respirationwhile plants participate in both cellular respiration and photosynthesis OB. Animals participate in cellular respiration , while plants do not OC Animals do not rely on plants for survival D. Animals participate in cellular respiration because it results in the same products as photosynthesis
Answers
during what stage do you have sleepwalking and sleep talking?
Answers
Sleepwalking occurs all through non-REM (NREM) sleep, normally in level 3 of the sleep cycle, which is likewise called deep sleep. Along with other parasomnias like sleep speakme, confusional arousals, and sleep terrors, sleepwalking is assessed as an NREM sickness of arousal.
Please Help!!!! Will mark brainlest.
Answers
Answer: The correct answer I assume would be C.
Explanation: Looking at the arrows it looks like both Large and Small Nematodes prey on arthropods. I hope this is correct :)
Which statement best explains how respiration and photosynthesis are related to one another?
A Respiration requires water that is given off during photosynthesis.
B. Photosynthesis requires oxygen that is given off during respiration.
C. Photosynthesis gives off carbon dioxide that is required for respiration
D. Respiration gives off carbon dioxide that is required for photosynthesis
Answers
Answer: D
Explanation:
photosynthesis - takes in water, energy from the sun, and carbon dioxide and releases oxygen and glucose (sugar)
respiration - takes in glucose and oxygen, and releases water and carbon dioxide and energy
they are basically the opposite
HAVE A GREAT DAY :)
What is the primary cause of groundwater shortage?
A)
pollution
B)
use exceeding the rate of replenishment
C)
lack of precipitation
D)
flooding
Answers
Answer:
Its B
Explanation:
Edge 2021
Answer:
The correct answer is D. All of the above
Explanation:
E2020!
I REALLY NEED HELP ASAP!!!!!!!
*I attached a picture but heres the question just in case!"
"The diagram below shows the structures of an animal cell. What is structure 3, and how does it help sustain life?"
Answers
Answer: I think it’s B but I am not sure sorry dude
Explanation:
why should we conserve ecosystem?
Answers
Answer:
Healthy ecosystems clean our water, purify our air, maintain our soil, regulate the climate, recycle nutrients and provide us with food.
*lf a strand has 35% adenine, what percent will be cytosine?
Answers
Answer:15% cytosine
Explanation:We know that the sample is 35% adenine, which tells us that it is also 35% thymine. We know that cytosine and guanine pair together and will be present in equal amounts, so we can divide this final total by 2 to find our answer. The sample is 35% adenine, 35% thymine, 15% guanine, and 15% cytosine.
What do you wonder about the inheritance of traits in complex organisms?
Answers
Answer:
l an a multicellular organism
Ability to capture smaller organism for food
Mutual Independence btw component cells
Increase in size, adaptation to environment
*WILL GIVE BRAINLIEST FOR BEST ANSWER DONT ANSWER IF YOU DONT KNOW AND NO VIRUS LINKS OR I WILL REPORT YOU!!!*
What is one result of meiosis?
A. two diploid cells
B. four diploid cells
C. two haploid cells
D. four haploid cells
Answers
Answer:
The final product of Meiosis is haploid daughter cells in which each cell has 23 chromosomes. What happens in meiosis is that, the cell is divided twice and this produces four daughter cells. During this process that our sex cells are produced. So the answer for this would be option D.
Explanation:
Answer:
D
Explanation:
Hope this helps! have a great day.
Also the people who post virus links are bots. They dont understand anything
Which parts of photosynthesis occur in the thylakoid membranes of the grana? Check all that apply.
The Sun’s energy is captured.
Carbon dioxide is used to build sugars.
Oxygen is produced.
Energy is transferred to ATP.
Answers
Answer:
I think there would be three correct answers from the choices listed above. The parts of photosynthesis which occur in the thylakoid membranes of the grana would be that the Sun’s energy is captured, oxygen is produced and energy is transferred to ATP. Hope this answers the question.
Explanation:
All forms of life work and must take in food to create_______?
Answers
Answer:
All forms of life work and must take in food to create energy.
Explanation:
Answer:
Energy!
Explanation:
Which of the following is an example of microevolution?
A. The formation of four new species of fish in a lake over thousands of years
B. A mass extinction that occurs because of major environmental changes in a habitat
C. A change in the frequency of body color in species of beetle over time
D. The formation of two new species of rodent that have been isolated by a mountain range
Answers
where can you get information about endangered species?
Answers
Answer:
The National Wildlife Federation
Explanation:
I think this is where you can learn about endangered species.
Hope this helps!
Provide a possible explanation for the
increase in size and weight of the elephants over millions of years.
Answers
The explanation for the increase in size and weight of the elephants over million years is that small evolution occurred over time, to increase the elephant size.
What is evolution?Evolution is a process in which the traits and characters of the organisms changes over time. These changes may occur due to adaptation and for food.
Thus, the explanation for the increase in size and weight of the elephants over million years is that small evolution occurred over time, to increase the elephant size.
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In a eukaryotic cell, which of the following processes directly involves DNA?
Answers
The provided question lacks the options, however, the options associated with the question is as follows;
A. translation
B. cellular respiration
C. active transport of ions
D. replication of chromosomes
Answer:
The correct answer is - D. replication of chromosomes.
Explanation:
During every cell division, either meiosis or mitotic the chromosomal DNA present in the nucleus is needed to be duplicated and the process that involves the duplication of this chromosomal DNA is known as replication of chromosome which takes place during the interphase of the cell division.
All other processes mentioned in the options are not involved or directly not involved in the processes. Translation involves the mRNA in the cytoplasm to produce amino acids with the help of ribosomes. Cellular respiration involves mitochondria and does not require DNA in the process.
What controls cell differentiation within
organisms?
Answers
Answer:
often controlled by cell signaling
Explanation:
meaning of the signal molecules that conversate information from cell to cell during the control of cellular differentiation are called growth factors
HELP! This is a fill in the blank I need a quick answer to.
Cells can make new cells. One cell can (a) ____________ into two new cells. This is called (b)__________________. The process of cell division goes through various states. First, the cell nucleus (c)________________ into two. A new cell surface membrane then (d)____________ the cell divides. The two new cells are called (e)_______________ and they are small. They will grow and become larger. They grow by getting (f)______________ from the food that is eaten. Once they grow to full size they can also (g)_____________. If cells divide more quickly than they should, or divide in the wrong way, (h)_____________ can develop.
Answers
Explanation:
A turn
B replicating
C enters
D make
E Big
F fat
A land based global community of organisms is called a?
Answers
NEED AN ANSWER ASAP
Which of the following would have the GREATEST effect on reducing the effects of
climate change??
Carpooling to work
Recycling
Biking to work
Switching to renewable energy sources such as wind and solar
Answers
Answer:
Switching to renewable energy sources such as wind and solarExplanation:if you are not useing renewable then your useing the oppsite wich is bad
Provide an example of how your body could maintain homeostasis in response to detecting that the body temperature was falling below 98.5 degrees.
Answers
Answer:
Our body produces heat energy.
Explanation:
When our body temperature decreases than normal range, our body produces heat to maintain internal heat in the normal range. Our internal body temperature is regulated by hypothalamus which is a part of our brain. The hypothalamus regulate the temperature and take actions to maintain it in the normal range of temperature which is about 37°C. If our body temperature is too low, the hypothalamus order to the body to generates heat energy and maintains heat in the normal range. The sweat glands remain inactive in order to prevent heat losses.
12
1 point
Which type of cell must contain a mutation in order for the mutation to be passed on to offspring (select 2)?
sperm cell
egg cell
skin cell
nerve cell
brain cell
blood cell