Look up one prion disease and describe it here. What population does this disease infect? How is it usually transmitted? How common is it? What are the major symptoms? Be sure to cite your sources.
Kuru is a Transmissible spongiform encephalopathy which was formerly common among the Fore people of Papua New Guinea. This disease is caused by a prion, i.e., a protein that can trigger other proteins in the brain to fold abnormally. The abnormally folded proteins in the brain cause neurodegeneration which ultimately lead to death. The main symptom of the Kuru disease is the loss of coordination and control over the muscle movements. The transmission of Kuru was because of a ritual in which Fore people consumed body parts of their family members just after their death. The Fore people stopped to eat human meat in the early 1960s, causing the kuru epidemic to decline dramatically. It is not certainly known if the last kuru victim died in 2005 or 2009.
Which of the following is anenvironmental factor thatcould cause a mutation?A. psychological agentsB. irrelevant mutagensC. internal agentsD. biological mutagens
The correct answer is D. biological agents. Mistakes when DNA is replicated is a common biological source of mutations.
The anatomy of spiders and insects is structurally identical.
Please select the best answer from the choices provided:
True
False
Dimples are dominant; no dimples are recessive. Mr. Dowling is heterozygous for dimples, and Mrs. Dowling is also heterozygous for dimples. What are the possibilities of their offspring?
The possibilities of the offspring to have dimples is 75% (TT, Tt and Tt) and no dimples are 25% (tt) because both the parents are heterozygous dominant.
What are the three laws of mendelian genetics ?Mendelian inheritance is a type of biological inheritance that follows the principles that were initially proposed by Gregor Mendel in 1865 and 1866, re-discovered in 1900 by Hugo de Vries and Carl Correns, and popularized by William Bateson.
Mendel put out the hypothesis that, in order for reproduction to occur, the inherited components need to partition themselves into reproductive cells. It had come to his attention that permitting hybrid pea plants to self-pollinate would result in offspring that did not resemble their respective parents in appearance.
Law of Dominance is one of Mendel's three proposed laws of inheritance, which also includes Law of Inheritance. The law that enforced segregation. The Principle of Independent Assortment is a Law.
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I extracted DNA from strawberry. I had to answer: - Why did the DNA separate to the top after adding the isopropyl alcohol? - Does all of your food have DNA? Explain your reasoning. - Why is it important for scientists to be able to extract DNA? Provide two examples.
1. Isopropanol is a compound used to dissolve lipids and as a dehydrating agent. When mixed with DNA, they compete for water causing the DNA to dehydrate and separating the mixture into two phases.
2. Every living organism contains DNA. This includes plants and animals, and therefore most of the food we eat.
3. DNA contains the hereditary information of all living organisms.
For example, in humans it is important to extract DNA for the identification of diseases, their causes and possible treatments.
In food, DNA extraction can help in the production of transgenic foods.
In order to maintain a high concentration of
potassium inside a cell (with a low
concentration outside) which of the following
must occur?
O passive transport
O active transport
O diffusion
O osmosis
Answer:
Passive transport does not require the cell to expend energy and involves a substance diffusing its concentration gradient across a membrane.
Sorry for the bad English, love from Vanuatu!
Explanation:
explain why something is biodegradable
If products do not decompose, ii will commonly dwell in landfills and so much area will be taken up. Biodegradable means that there is the abililty to be decomposed and there is no harm in the ecosystem produced by this process. Materials or objects can be broken down to smaller parts and absorbed into the soil that will serve as nutrients.
At what level of protein structure do amino acid chains twist and fold?a) Tertiaryb) primary c) secondary d) Quaternary
The primary structure occurs when the protein structure is only a chain of amino acids, with no folds or twists. Therefore, b) is incorrect.
This primary structure then twists folds in itself, creating the structure that's folded and held in shape by hydrogen bonds. That's the secondary structure, and whats is folded in it is the amino acids. Therefore, c) is the correct answer.
The tertiary structure is a three-dimensional structure, shaped by interactions between the R groups of the amino a cids. To form this structure, the entire secondary structure elements (not the amino acids) are folded together. Therefore, a) is also incorrect.
The quaternary structure is a closely pack arrangement of several protein chains, each with its own primary, secondary and tertiary structure. Therefore, d) is wrong as well.
The complimentary base strands for TGA CAA CGA GGT ACT are start
The complimentary base strands for TGA CAA CGA GGT ACT are start
ACT GTT GCT CCA TGA.
Complimentary base strands- Adenine and guanine, as well as thymine and cytosine, are the complimentary bases in DNA. A nitrogen-containing base, such as guanine, adenine, thymine, or cytosine, a monosaccharide sugar termed deoxyribose, and a phosphate group make up each nucleotide in DNA.
The complimentary bases may unite to form a bond. This aids in holding the DNA molecule's two antiparallel strands together just to form the helix. The complimentary base pairing rule refers to this.
According to Chargaff's criteria, DNA from all cells of all creatures should contain a 1:1 ratio of pyrimidine & purine bases. More specifically, the amounts of guanine and adenine should be equivalent to cytosine and thymine, respectively.
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When a gardener only plants seeds from the roses that are dark red, the process involved isSelect one:a.artificial variation.b.natural selection.c.artificial selection.
The process of selective breeding species, as the one we can see in the question's paragraph, is known as artificial selection, and it's a way to propagate a trait in the next generation of that species, in that case, it would be the dark red color of the roses.
What type of muscle typically forms a lining for various organs?A) Rough muscleB) Smooth muscleC) Cardiac muscleD) Skeletal muscle
The type of muscle that typically forms a lining for various organs is the smooth muscle. (option B)
how is the rate of photosynthesis affected when leaf disks are exposed to different concentrations of bicarbonate solution?
The rate of photosynthesis affected when leaf disks are exposed to different concentrations of bicarbonate solution when the leaf disks immersed in the solution with the highest proportion (0.8% sodium bicarbonate solutions) rose in an average time of 4.91 minutes. This experiment demonstrates that the rate of photosynthesis can increase when there is more carbon dioxide present.
Photosynthesis- The method through which certain living animals and green plants convert sunlight into chemical energy. In green plants, visible light is gathered and utilized during photosynthesis to transform water, carbon dioxide, plus carbohydrates to make the glucose molecule. The photosynthesis occurs in two ways either PSI or PSII.
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Indicate the location and function of the plasma membrane, as well as an analogy of it.
Plasma membrane it's located in the exterior of all cells.
The plasma membrane has several functions: first, it's the barrier between the interior of the cell and the rest of the environment; secondly, it protects the cell and gives it support; it also regulates what substances pass to the interior of the cell.
If the cell was a ballon, the plasma membrane would be the latex and all the air inside would be the cytoplasm.
True or FalseDarwin theorized that the forces seen today in the biological world such as reproduction, inheritance, and competition gradually produce the whole diversity of life on Earth.
The correct answer is FALSE. Although Darwin, indeed recognized reproduction and competition as important drivers of global biodiversity, he did not included the role of inheritance. Rather, he emphasized the role of competition and natural selection.
Which allele will be expressed when both a dominant and recessive allele arepresent in an organism?A. the two alleles will mixB. dominant onlyC. recessive only
The answer is the letter B. dominant only
*Dominant allele is expressed exclusively in heterozygous organisms (presence of dominant and recessive allele).
*Recessive traits are expressed when the organism has a homozygous recessive allele.
A man (A+) and a women (B+) are expecting a baby together. Make a two-trait (dihybrid) Punnett square and determine the probability of each blood type in their offspring. A+ ___:16B+ ___:16AB+ ___:16O+ ___:16A- ___:16B- ___:16AB- ___:16O- ___:16
A+ _3__:16
B+ __3_:16
AB+ _3__:16
O+ _3__:16
A- _1__:16
B- __1_:16
AB- _1__:16
O- __1_:16
Two black guinea pigs were mated and produced 29 black and 9 white offspring. What were the genotypes of the parent guinea pigs? What are the expected phenotypic and genotypic ratios of the offspring?
If the mating of 2 black guinea pigs produced 29 black and 9 white offspring, the genotypes of the parents would be heterozygous.
Expected phenotype ratio = 3:1 black to white
Expected genotypic ratio = 1 AA:2Aa:1aa
Monohybrid crossingThe mating of 2 black guinea pigs produced 29 black and 9 white offspring. The parents must be heterozygous.
Assuming the allele for the black trait is A while that of the white trait is a. The cross is between Aa and Aa.
Aa x Aa
AA Aa Aa aa
The black allele is assumed to be dominant over the white allele. Thus:
Phenotype ratio = 3:1 black to white.
The ratio of the offspring produced from the mating is 29 black to 9 white, which is roughly 3:1. Thus, the mating is between two heterozygous black individuals.
Expected phenotype ratio = 3:1 black to white
Expected genotypic ratio = 1 AA:2Aa:1aa
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Give a general description of these two species •Wolf spider•Eastern gray squirrel(What are the roles they have in an environment? what do they look like? What do they eat?)
When we consider species like the ones the question tells us about, we usually one faces an example of predation, since squirrel can behave as tertiary consumers for spiders, which are then secondary consumers. So the roles they develop in the environment can be named as population maintenance (especially for the squirrels, because they can control the wolf spider population, and spiders can allow them to continue their population growth).
Did the WES2 station move at a constant speed since 1995?
Answer:
probably not
Explanation:
When a velocity's magnitude and direction do not alter over time, it is said to be constant.
What is meant by Constant speed?Constant speed refers to a speed that remains constant throughout the duration of the motion. Constant speed is demonstrated in our example of using cruise control while driving a car.
When a velocity's magnitude and direction do not alter over time, it is said to be constant. In other words, this occurs when an object's rate of change in location remains constant throughout time.
An object is considered to be moving at a constant speed when it covers the same distance in the same amount of time. When moving at a constant place, an object covers a certain distance in a fixed amount of time. S = dt is a formula that can be used to express the speed.
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What makes the reactants of photosynthesis and the reactants of cellular respiration similar?(1 point)Both involve combinations of glucose, water, and carbon dioxide.Both involve light energyBoth involve combinations of carbon, hydrogen, and oxygen. (my answer)Both involve ATP molecules.
Photosynthesis and cellular respiration are, in a way, opposite reactions.
While photosynthesis takes the light energy and water and converts carbon dioxide into glucose, cellular respiration takes the glucose to produce chemical energy and it results in carbon dioxide and water.
This means that both reactions involve glucose, carbon dioxide, and also water, so this would be the correct answer (A).
How many daughter cells are produced by the end of Mitosis?
A 1
B 2
C 3
D 4
Answer:
it produces two (2) daughter cells
Which of the following processes is not associated with sexual reproduction?OOOOmeiosisfertilizationbinary fissionrecombination
Of the following processes the one that is not associated with sexual reproduction is the binary fission, that is a asexual reproduction by a separation of an organism of the body into two new bodies.
I need help with this practiceThe subject is about the invasive species KudzuTake your time to review the photo and then answer in your own words shortly
• They can be introduced to an area by ship ballast water, accidental release, and most often, by people. Invasive species can lead to the extinction of native plants and animals, destroy biodiversity, and permanently alter habitats.
,• Biodiversity plays a crucial role in human nutrition through its influence on world food production, as it ensures the sustainable productivity of soils and provides the genetic resources for all crops, livestock, and marine species harvested for food.
What molecule fits easily through the cell membrane's phospholipid bilayer?
A Protein
B Oxygen
C Glucose (Sugar)
D Salt
Answer:
B
Explanation:
since gases can pass through the phopholipids bilayer :)
True or FalseNatural selection and mutation have proven to have been able to produce a new kind of organism.
The statement is false.
New kinds of organisms are impossible to make because we don’t have the necessary information, (programming) or material to be able to construct kinds of organisms.
What would be the result on daughter cells if a cell did not complete S phase properly?
Answer:
The growth of all cells is governed by the cell cycle, including cell division. Before a cell can divide, many processes must occur, including the proper duplication of the chromosomes. The cell cycle ensures that all of these processes occur normally, otherwise the cell ceases to progress and could die
Explain what is meant by “dimorphic” and how this term applies to pathogenic fungi.
Dimorphism is the occurence of the existence of two forms, in the case of sexual dimorphism the existence of two distinct types of a individual. The dimorphism among fungi is the capacity to convert between two specific morphological forms, like hyphae and yeast, the Ascomycota phylum have dimorphic organism. The dimorphism in fungi can happen depending of environmental condictions or situations, like an yeast in cold temperatures turning into mold.
Help assp…..
What are the divisions of the PNS? (Choose all that apply)
A.autonomic nervous system
B.reflex arc
C.parasympathetic nervous system
D.somatic nervous system
it is B C and D
Hope this helps
Reflex arc, parasympathetic nervous system and somatic nervous system are the divisions of peripheral nervous system.
What are the functions of peripheral nervous system?The peripheral nervous system is one of two components that make up the nervous system of bilateral animals, with the other part being the central nervous system. The PNS consists of nerves and ganglia, which lie outside the brain and the spinal cord.
The peripheral nervous system refers to parts of the nervous system outside the brain and spinal cord. It includes the cranial nerves, spinal nerves and their roots and branches, peripheral nerves, and neuromuscular junctions.
The peripheral nervous system is divided into two main parts: Autonomic nervous system (ANS): Controls involuntary bodily functions and regulates glands.
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Define gluconeogenesis and lipogenesis. Under what conditions do they predominantly occur?
The process of producing glucose (sugar) from lipid (fat) or protein breakdown products, as well as from its breakdown products is called gluconeogenesis whereas the creation of fatty acids from nonlipid precursors is known as lipogenesis.
Gluconeogenesis predominantly occurs both in the kidneys and the liver, because phosphoenolpyruvate carboxykinase is inhibited by ADP. As a result, gluconeogenesis is encouraged in cells that are abundant in ATP and biosynthetic precursors.
The liver, adipose tissue, small intestine, kidneys, and mammary glands are the primary sites of lipogenesis. Additionally, it happens in blood lipoproteins and the digestive system. It is a metabolic pathway that is activated by the high availability of carbohydrates and is used to break down extra carbohydrates.
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PLS HELP FIND CONTOUR INTERVAL N ILL MARK BRANLIEST!!
Directions: Study the contour map below. Using the contour map and what you learned
from the lesson, complete the questions below. When your report is finished, submit it to
the Topographic Maps Lab dropbox for grading. This assignment is worth 20 points.