I need help please

Are mutations always harmful? Why or why not?

Answers

Answer 1

Answer: Mutational effects can be beneficial, harmful, or neutral

Explanation:

Most non-neutral mutations are deleterious. In general, the more base pairs that are affected by a mutation, the larger the effect of the mutation, and the larger the mutation's probability of being deleterious.

"nature.com"


Related Questions

Sperm is produced in the?

Answers

Answer:

testis

Explanation:

produced from the testicals

Answer:

testis

Explanation:

produced from the testicals

What differences would you expect to see in a population made up of individuals whose chromosomes experience crossing-over frequently compared with a population made up of individuals whose chromosomes do not cross over? Please explain your reasoning.

Answers

Explanation:

Crossing over is a type of recombination that occurs during prophase I of meiosis and results in the exchange of genetic material between homologous chromosomes. In a population where crossing over occurs frequently, there would be increased gene pool or genetic drift and variations compared to a population where individual chromosomes do not cross over. The offspring will be genetically unique because of crossing over and independent assortment.


Which of the following parts of a prokaryote is the part of the cell membrane that is folded in and thought to be used
for helping DNA replicate?
A. Mesosome
B. Genophore
C. Peptidoglycan
D. Cell wall

Answers

Answer:

a

Explanation:

: an organelle of bacteria that appears as an invagination of the plasma membrane and functions either in DNA replication and cell division or excretion of exoenzymes.

The following part of the cell membrane that is folded in and thought to be used for helping DNA replicate is the mesosome. The correct option is A.

What is mesosome?

Mesosome is a round organelle that is present in prokaryotic organisms like bacteria. These organisms present as introversion in the plasma membrane. This organ helps in many functions of the cell like DNA replication and cell division.

DNA replication is a process of replicating DNA in other cells. It happens in the process of cell division. In bacteria cells, mesosomes help in the distribution of DNA into the daughter cells during the division.

Thus, the correct option is A. Mesosome regarding the organelle present in the bacteria helps in DNA replication.

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Alguien me puede explicar

Answers

Yes, because if two samples come from the same individual, all the bands of one sample must coincide with all the bands of the other. Compare the bands in each sample and determine if any of the suspects left the blood found at the crime scene.

Steven wants to decorate his office surroundings with different ornamental plants. Which professional should Steven consult? ОА soil scientist OB. biotechnologist OC. horticulturists OD. agricultural engineer​

Answers

Answer: the correct option is C (horticulturists)

Explanation:

ORNAMENTAL PLANTS are defined as those plants that has outstanding and unique flowers, fragrance an interesting shape, colorful or unusual bark, excellent fall color, or a combination of these and other features. While some of these plants add framework and structure to the garden and provide at least a little shade.; others also make great background plants for shrub and flower borders.

HORTICULTURISTS are individuals that deals with the aspect of agriculture which involves the cultivation of plants, vegetables, fruits, flowers, herbs, ornamental trees, maintaining nurseries, gardens, orchards and plantations. To be more specific, ornamental horticulturist are those that works with plants used in decoration or recreation, which is mostly done at a nursery, floral shop, landscaping or office surroundings.

As regards the use of animal models,

Select one:

a.
Animals can model anything in the realm of human psychology


b.
The rat brain is completely different from a human brain in its neuroanatomy


c.
The 5-choice serial reaction time task is a way to operationalize spatial memory and spatial learning


d.
Rats can drive little cars


e.
All of the other answers are correct

Answers

Answer:

b number is the answer is it ok

to what do you attribute the odors of anaerobic decomposition

Answers

Answer:

yessssssjshsbzvsghsha


1) Explain how trees cool the environment ??

Answers

Answer:

Trees cool the environment by shading small areas.

Trees cool the air by shading. They cool the air during the process of ‘transpiration cooling’.

the life cycle of animals

Answers

First birth then growth, reproduction and then death.

These are the 4 factors that take place in the circle of life of an animal

someone knows the answer would help me

Answers

Answer:

I just responded to you so therefore my response to you is the answer.

Explanation:

Have a great Day;)

explain how the mammalian skin perform it's role as a thermoregulatory



Answers

Answer:

The skin contains many blood capillaries and sweat glands ,the sweat glands secrete sweat when it is hot.when the sweat evaporates from the skin it cools the body.thermoregulation by the skin occurs through dilation and constriction of the blood vessels.when the bodies temperature raises,the blood vessels carry heat in the blood to the skin.the blood capillaries dilate become wider so that more heat can be lost to the environment.this is called vasodilation.when the outside temperature is low,the blood capillaries constrict become narrower so that less blood flows to the surface of the skin.therefore less heat is lost to the environment this is called vasoconstriction.

I hope this helps

Sponges (phylum: Porifera) are animals that possess feeding cells called collar cells. These cells have a central flagellum surrounded by a collar of microvilli. The collar filters organic matter out of the water column. Which protist shares a more recent common ancestor with the poriferans

Answers

Answer: Choanoflagellates

Explanation:

Protists are organisms that have both plant and animal like characteristics. Some protists develop more plant like characteristics and others more animal like characteristics. Choanoflagellates are the protists which looks like animals called sponges. These protists are single celled organisms. Their function is similar to collar cells of the sponges that is they produce current in water that draws water and food particles via the body of sponges and they filter the food particles through their microvilli.

A 53 year old man presents with increasing gastric pain and is found to have a 3 cm mass located in the anterior wall of his stomach. This mass is resected and histologic examination reveals a tumor composed of cells having elongated, spindle-shaped nuclei. The tumor does not connect to the overlying gastric epithelium and is instead found only in the wall of the stomach. The tumor cells stain positively with CD117, but negatively with both desmin and S-100. Special studies find that these tumor cells have abnormalities of the KIT gene. Which of the following is the most likely diagnosis?

a. Lymphoma of mucosa-associated lymphoid tissue (MALToma)
b. Ectopic islet cell adenoma (VIPoma)
c. Gastrointestinal stromal tumor (GIST)
d. Submucosal leiomyoma ("fibroid tumor")
e. Nonchromaffin paraganglioma (chemodectoma)

Answers

Answer:

The correct answer is c. Gastrointestinal stromal tumor (GIST)

Explanation:

Gastrointestinal stromal tumors (GIST) are rare neoplasms that originate from mesenchymal cells, generally express the KIT receptor (CD117) and present activated mutations of the tyrosine kinase or tyrosine kinase receptor proto-oncogene, cKIT (it is the gene that encodes KIT protein synthesis). GISTs can be located in any portion of the wall of the GI tract, but most are located in the submucosa or in the muscularis propria. Some are predominantly extramural; large ones can infiltrate neighboring organs

A gastrointestinal stromal tumor (GIST) is the most likely diagnosis (Option C).

Cancer is a multifactorial disease in which cancer cells divide and proliferate to produce a tumor.

Cancer is often associated with mutations in key genes which are required for the normal functioning of a given tissue (e.g. cell cycle genes).

A gastrointestinal stromal tumor (GIST) is a tumor in which cells of the stomach proliferate in an uncontrolled manner.

In conclusion, a gastrointestinal stromal tumor (GIST) is the most likely diagnosis (Option C).

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A. Look carefully the next image, label its parts with the words from the box: SPINAL CORD CEREBRUM CEREBELLUM PERIPHERAL NERVES BRAIN STEM ​

Answers

No

You're welcome please give brainliest

on a molecular level why does lifting weights consume energy

Answers

Answer:

to contract a muscle, myosin and actin filaments shorten, requiring ATP binding and hydrolysis

Explanation:

hopes it help

 what happens when transitioning between photosynthesis and cellular respiration?

Answers

When it passes between photosynthesis and respiration, the carbon atom does not change. Atom bonds are removed from three carbon molecules during various processes. Molecules take in glucose and oxygen and then go through fermentation which does not need oxygen.

The phenomenon of single or double fertilization is unique to the seed plants

Answers

Answer:

Double fertilization

Explanation:

The phenomenon of double fertilization is unique to flowering plants (i.e., angiosperms). Each pollen grain produces two male gametes (sperm cells), one of which fertilizes the egg to form the zygote, whereas the other sperm fuses with polar nuclei in the female gametophyte in order to form a triploid cell (3n) called endosperm. Subsequently, this endosperm will support embryonic growth by supplying storage nutrients and by serving as a mechanical barrier during seed development and germination.

what measure against mosquitoes is least harmful to the environment ​

Answers

Answer:

Eliminate standing water in rain gutters, old tires, buckets, plastic covers, toys, or any other container where mosquitoes can breed. Empty and change the water in bird baths, fountains, wading pools, rain barrels, and potted plant trays at least once a week to destroy potential mosquito habitats.

Humans are diploid; every individual carries only two alleles.

a. True
b. False

Answers

A. True :)


I hope this helps

A tall plant is crossed with a short plant, and the progeny are all intermediate in size between the two parental plants. If the intermediate F1 progeny were allowed to self-pollinate, and the F2 progeny were also intermediate in size, but following a normal distribution, this would suggest

Answers

Answer:

A tall plant is crossed with a short plant, and the progeny are all intermediate in size between the two parental plants. If the intermediate F1 progeny were allowed to self-pollinate, and the F2 progeny were also intermediate in size, but following a normal distribution, this would suggest polygenic inheritance.

Explanation:

Two or more genes contribute to the determination of a certain trait in polygenic inheritance.

What is polygenic inheritance?

When a tall plant and a short plant are crossed, all the offspring fall between the two parents plants in terms of height.

It would indicate polygenic inheritance if the intermediate F1 progeny were permitted to self-pollinate and the F2 progeny had intermediate sizes and followed a normal distribution.

Consequently, one personality trait is managed through is controlled by at least two other genes, at least two additional genes.

Therefore, If the intermediate F1 progeny were allowed to self-pollinate, and the F2 progeny were also intermediate in size, but following a normal distribution, indicate polygenic inheritance.

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What kind of claim type does this statement make? Abbey Road is a much better album than Let It Bleed.

Select one:
a.
value
b.
policy
c.
fact

Answers

A . Value because that’s your valued opinion

The kind of claim type does this statement is the value claim.

A claim of value refered to something as either good or bad, or that one thing is better than another thing.

Example of value: Abbey road album is better than let it bleed.

Conclusively we can therefore say that option A is the answer that best fit the statement above.

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Biomagnification results in higher amounts of toxic substances for organisms on the food chain
True
False

Answers

Answer:

Biomagnification results is higher in amount of toxin substances so the answer is true

Explanation:

Green house effect is caused by a) Green plants b) Infra red rays c) UV rays d)X-ray​

Answers

I think C is the answer
It is caused by c) Infrared rays ! ☺️ hope I helped!

Why can't we meet all of our protein needs in one meal?

Answers

Because most people go for what tastes good rather than what is protein rich, and what tastes good is usually high in fat and carbohydrates, as opposed to proteins.

Bert has blonde hair (b). Molly has brown hair (B), but her genotype is Bb, meaning she carries a recessive blonde allele. What is the likelihood of Bert and Molly's second child having brown hair?

Answers

Answer:

50%

Explanation:

Iif you do a punnet square you get Bb, Bb, bb, and bb

since blond is represneted by the recessive bb it's a 50% the child will have blond hair

The function of the placental hormone human placental lactogen (hPL) is to ________. Question 12 options: prepare the breasts for lactation nourish the placenta regulate the menstrual cycle help the placenta to mature All of the above are true.

Answers

Answer:

nourish the placenta

Explanation:

The hormone called human placental lactogen (hPL) is a hormone secreted by the placenta, which functions to supply nutrients and oxygen to the growing fetus in the womb.

The human placental lactogen is produced to help in the efficient use of ingested food substances in the production of energy (metabolism). This indirectly helps to nourish the placenta because if the mother efficiently converts food into nutrients, the placenta is also adequately nourished.

Which of the following is false concerning Salmonella and Shigella? A. Shigella are H2S + and motile, Salmonella are H2S - and nonmotile. B. Salmonella Typhi causes typhoid fever with serious systemic spread. C. Shigella cause bacillary dysentery. D. There is a capsule and an attenuated living vaccine for typhoid fever. E. Shigella dysenteriae produces the most severe form of shigellosis and may lead to HUS and kidney damage due to production of Shiga toxin.

Answers

Answer:

A. Shigella are H2S + and motile, Salmonella are H2S - and nonmotile

Explanation:

Shigella is a genus of Gram-negative (i.e.,  they have a cell wall composed of a thin layer of peptidoglycan), nonmotile, and facultative anaerobic bacteria; whereas Salmonella species are Gram-negative and facultative anaerobic bacteria. Moreover, Salmonella are motile bacteria, in a similar way to other human pathogenic bacteria (e.g., Vibrio cholerae, Pseudomonas aeruginosa, and E. coli). Salmonella can produce hydrogen sulfide (H2S) from thiosulfate or sulfite; whereas Shigella species are unable to produce hydrogen sulfide. Typhoid fever, also known as enteric fever, is an infection caused by S. typhi that can spread throughout the body and affect different organs (i.e., it is a multisystemic illness). Vivotif (Typhoid Vaccine Live Oral Ty21a) is a live attenuated bacterial vaccine used for oral administration only; whereas Vi capsular polysaccharide vaccine (ViCPS) is a vaccine administered by injection. Finally, shigellosis is an infection that affects the digestive system caused by Shigella bacteria. In this regard, S. dysenteriae produces a potent cytotoxin known as 'Shiga toxin' that may cause local destruction of the colonic epithelium.

Below is an image of a nucleus before it divides via meiosis. The chromosomes shown in red are from the female parent, and the chromosomes
in blue are from the male parent. Predict the gametes that can be created from this organism and explain the reason these different gametes are
possible.

Answers

Answer:

I predict that the gametes will be unique from their parents.

Explanation:

I predict that the chromosomes will pair up, with each pair having a red chromosome and a blue chromosome, then they'll cross over and exchange similar genetic information with each other. I think this because variety is important for any species for survival.

write a documentary on journey of corona virus​

Answers

Answer:

at this situation we need to take care of ourselves

because we know that it's disease which leads us to death

Coronavirus started as a vacation for all of people across the world celebrities people that work hard people that just needed a break from their job however it turned it into so much more it made small businesses lose so much money it made people lose the ones that they loved and it made riots and so many other things that needed to be said finally come out to the public there’s many ways that you could say coronavirus has had a bad impact on humanity but in other ways it’s made so many things that were kept in the dark finally coming to the light (BLM) it’s truly change some people people that used to be extroverts turn into introverts and it’s made us all show our true side because it scared all of us

Question 7(Multiple Choice Worth 4 points)
(01.03 MC)
The evolution from vesicles to true cells was enabled by the development of

A) a membrane separating the cell from its environment
organic molecules, such as carbohydrates and lipids

B) self-replicating molecules, such as RNA and DNA
Thing

C) inorganic molecules, such as nitrogen and oxygen

Answers

Answer: The correct option is B (self-replicating molecules, such as RNA and DNA)

Explanation:

The current theory of the process of evolution makes use of present day knowledge of genes and chromosomes to explain the source of genetic variation upon which natural selection works. These genes are discrete units of inheritance which determine hereditary characteristics. All the information for the inheritable characteristics of an individual are contained in these genes.

When a cell divides, the genes duplicate themselves so that each daughter cell has an identical set of genes as the original parent cell. These genes are passed from parents to offspring in the gametes of the parents.

Gene are found in the DNA( Deoxyribonucleic acid) molecules or RNA (Ribonucleic acid) molecules. These molecules are capable of self replication due to a process called mutation. Mutations are random changes in DNA that alter genetic information and sin introduce new characteristics. They may occur

--> in body cells or

--> during gamete formation.

Thus, evolution from vesicles to true cells is through self replicating molecules through the process of mutation which is the raw material for evolution

Answer:

B (self replicating molecules such as RNA and DNA)

Got it right on the bio test.

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