Answers
Related Questions
A researcher wanted to create a loss of function mutation for studying Type I Diabetes in a model animal. What mutation would mimic Type I diabetes?
a) Inhibition of sugar absorption in the small intestine
b) Inhibition of pancreatic beta-cells
c) Up regulation of insulin receptors on the pancreas
d) Down regulation of GLUT4 transporters in muscles
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Answer:
The correct answer is: b) Inhibition of pancreatic beta-cells.
Explanation:
Type 1 Diabetes is a form of Diabetes Mellitus, a condition characterized by chronic hyperglycemia (high blood sugar levels) that can compromise many organs and even cause death if not treated properly.
The most common form of Diabetes Mellitus is Type 2 Diabetes, in which the pancreas produces insulin but cannot reach the target organs because of a pathologic state called Insulin Resistance.
Type 1 Diabetes, instead, is present in patients that cannot produce insulin on their own. Insulin is the most important hormone in the regulation of blood sugar - it is secreted by the pancreatic beta-cells when glycemia rises (which is normal after eating) and it is key in allowing glucose to reach the tissues where it's needed for energy requirements. Type 1 Diabetes is usually diagnosed in young, even pediatric, patients - the pancreatic beta-cells in these individuals are destroyed and unable to function (the reason for this is not clear in all cases), so they have to be administered with exogenous insulin to survive.
For the model animal to better represent Type 1 Diabetes, the mutation would have to inhibit pancreatic beta-cells.
While alive, an organism absorbs (radioactive) carbon 14 at such a rate that the proportion of carbon 14 in the organism remains at a known constant level. When it dies, it no longer absorbs carbon 14, so its proportion of carbon 14 begins to decrease. The half-life of carbon 14 is 5,600 years. A human skeleton is discovered whose level of carbon 14 is 15% that of a living human. To the nearest 100 years, how long ago did the person die
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Answer:
The person has been dead for approximately 15,300 years
Explanation:
Available data:
The half-life of carbon 14 is 5,600 yearsThe human skeleton level of carbon 14 is 15% that of a living humanTo answer this question we can make use of the following equation
Ln (C14T₁/C14 T₀) = - λ T₁
Where,
C14 T₀ ⇒ Amount of carbon in a living body at time 0 = 100%C14T₁ ⇒ Amount of carbon in the dead body at time 1 = 15% λ ⇒ radioactive decay constant = (Ln2)/T₀,₅T₀,₅ ⇒ The half-life of carbon 14 = 5600 yearsT₀ = 0T₁ = ???Let us first calculate the radioactive decay constant.
λ = (Ln2)/T₀,₅
λ = 0.693/5600
λ = 0.000123
Now, let us calculate the first term in the equation
Ln (C14T₁/C14 T₀) = Ln (15%/100%) = Ln 0.15 = - 1.89
Finally, let us replace the terms, clear the equation, and calculate the value of T₁.
Ln (C14T₁/C14 T₀) = - λ T₁
- 1.89 = - 0.000123 x T₁
T₁ = - 1.89 / - 0.000123
T₁ = 15,365 years
The person has been dead for approximately 15,300 years
When crossing a true breeding white mouse with a true breeding brown mouse your friend tells you she recovered all black mice. But then when she crosses the F1 mice to each other she recovered 28 black mice, 8 brown mice, and 13 white mice. Can you help her explain these results? (Type out the cross and include genotypes of as many mice as possible. What phrase best describes this phenomenon? How many genes are involved are they linked or unlinked? Etc.)
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Answer:
Following are the response to the given question:
Explanation:
[tex]White = aaBB \\\\Brown = AAbb\\\\Parental \ \ cross: aaBB \times AAbb\\\\F1 \ progeny: AaBb\\\\F1 \ selfing: AaBb \times AaBb\\\\F2 \ progeny:\\\\[/tex]
[tex]\frac{9}{16} = A_{B_} = Black\\\\[/tex]
[tex]\frac{3}{16} = aaB_ \ = White\\\\[/tex]
[tex]\frac{3}{16} = A_{bb} = Brown\\\\\frac{1}{16} = aabb = White\\\\[/tex]
The observed progeny ratios closely match the morphological ratio of 9:3:4. That's a hereditary pharmacogenetic example.
Applying a number of distinct genes = 2
You have really no connection
Phenomenon=Recessive Epistasis
Andrew is trying to identify an unknown element. The element is dull and
brittle, and it is a poor thermal and electrical conductor. Where on the periodic
table is this element most likely found?
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Answer:
non metals
Explanation:
The growth of the human population directly relates to the use of natural resources by humans. Based on the graph, which two statements about human use if natural resources are most likely true?
A. resources use by humans will be higher in 20 years than it is now
B. resource used by humans is much higher now than it was 200 years ago
C. Resource used by humans in steadily decreasing over time
D. Resource used by humans is about the same now as it was 150 years ago
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Answer:
A. resources use by humans will be higher in 20 years than it is now
B. resource used by humans is much higher now than it was 200 years ago
Explanation:
The growth of the human population has direct relation with the use of natural resources by humans means if the population of humans increases, more natural resources will be consumed by the population. Directly relation means if one increases the other automatically and vice versa. more population needs more resources for their growth and survival so we can conclude that resources used by humans will be increases if the population increases.
Engineers design a system for heating the air in a house. They want the
heater to bring the temperature to a comfortable level and then maintain it.
Which option describes how the engineers should design the system?
O A. Include a control in the system that senses the air temperature
and causes negative feedback, reducing the output of the heater.
O B. Design the system with a control that maintains a constant level of
output from the heater.
C. Include a control in the system that varies the input level in a
regular cycle.
Design the system with a control that allows positive feedback to
enhance the heating ability of the system,
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Answer:
I think its c include a control in the system that varies the input level in a regular cycle.
Explanation:
Which type of process occurs in the absence of oxygen?
cellular respiration
photosynthesis
fermintation
all of the above
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photosynthesis prosecss in the absence of oxygen
2. Is caffeine really a source of energy
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Answer
Yes i believe so
Explanation:
hi im new just joined
The caterpillar, which is the larval stage of a butterfly, is very different from its adult form. Which phenomenon is responsible for this difference?
A. metamorphosis
B. regeneration
C. alternation of generation
D. molting
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Metamorphosis IIRC, hope this help
Answer:
A
Explanation:
Metamorphosis is the process when large biological changes can occur like the transition from caterpillar to butterfly.
What are the three different ways a baby animal develops and what is it called?
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Fertilization, the entry of the sperm cell into the egg cell, followed by the union of the two cells' nuclei;
Embryogenesis (embryonic development) with. ...
Metamorphosis to an imago or adult.
Nonrenewable resources are those that cannot be replaced faster than they are used up by human populations. Do you think the resources you read about in this activity are nonrenewable? Explain why.
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Answer:
first of all non renewable energy or resources is s energy or resources that can last for a particular time . such resources are depleted and cannot be replenished as the are used.
Explanation:
I think so because it is been recharged. e.g the phone been used is recharged or powered through electricity which can also be powered through waves of water from dams( kanji dams)
Complete each of the sentences with the correct word or words regarding the function and structure of nails.
a. Nails are a scalelike modification of the __________layer of the _________
b. Nails form on the _______edges of the fingers and the toes.
c. Fingernails _________digits from damage protect the
1. stratum corneum
2. do
3. dermis
4. do not
5. ventral
6. epidermis
7. dorsal
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Answer:
a. nails are a scalelike modification of the stratum corneum layer of the epidermis
b. nails form on the dorsal edges of the fingers and toes
c. fingernails do protect the digits from damage
Explanation:
The stratum corneum consists of the top layer of the epidermis (i.e., skin). Nails represent a modification of the epidermis and they are composed of densely packed dead skin cells (keratinocytes), which are rich in a protective protein called alpha-keratin. The nail plate is the hard keratinized part of the nail. The nail bed is the skin underneath the nail plate. The nails grow from the proximal portion of the nail bed, which is known as the nail matrix. The main function of the nails is to protect the tips of fingers and toes from injury.
i)
State why the cobalt chloride paper is kept in a jar with a ground glass
stopper
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Answer:
bcz it is harmful for human body
Explanation:
What is the kind of asexual reproduction
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The strand of RNA moves to the ribosome.
The DNA double helix unzips.
The strand of RNA leaves the nucleus.
A protein is produced.
A strand of RNA is made from a strand of DNA.
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The strand of RNA moves to the ribosome.
✔ 4
The DNA double helix unzips.
✔ 1
The strand of RNA leaves the nucleus.
✔ 3
A protein is produced.
✔ 5
A strand of RNA is made from a strand of DNA.
✔ 2
Which best describes the ecosystems on Earth?
A. Earth has mostly rain forest ecosystems.
B. Separate ecosystems can affect each other.
C. There are very few types of ecosystems on Earth.
D. Ecosystems do not interact with each other.
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Answer:
Explanation:
B. có nhiều hệ sinh thái khác nhau trên trái đất. mỗi hệ sinh thái có một đặc tính riêng và chúng có thể kết nối, tác động qua lại với các hệ sinh thái khác
Which gas is used by humans in the process of cellular respiration?
A) methane
B) nitrogen
C) oxygen
D) carbon dioxide
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Answer:
oxygen is used by human in the process of cellular respiration
describe the internal diameter of the aorta.
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Answer:
In sonographic measurements performed in the transverse view, the diameter of aorta (Ao) constituted 15.7 mm, the longer dimension of the inferior vena cava (IVC1) equaled 28.4 mm and the shorter one (IVC2) – 15.5 mm. In the longitudinal view, Ao equaled 15.3 mm and IVC – 18.8 mm (tab.
The arctic fox has a diploid number of 50 an arctic fox was forming gametes by meiosis, how many chromosomes would be visible in prophase 17 Are the chromosomes replicated or non-replicated?
a. 2. 50; unreplicated
b. 28; replicated
c. 100, replicated
d. 25: unreplicated
e. 6.50; Replicated
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Answer:
50 visible chromosomes and replicated.
Explanation:
Diploid number 50Haploid number 25When we talk about the cell cycle, we refer to the interphase and the cell division (mitosis or meiosis).
Interphase is composed of stages G1, S, and G2. During the S stage, the DNI replication process occurs. This is the only stage in which the DNI molecule replicates. The synthesis of histones and other associated proteins also occurs.
Meiosis occurs after the interphase is over.
Meiosis produces four daughter haploid cells (n) from a diploid germ cell (2n). Each daughter cell is haploid because they have half the number of chromosomes of the original one.
At the beginning of prophase 1, DNI is condensed in a well-defined chromosome formed by two sister chromatids joined by a centromere. Each chromosome carefully pairs with its homologous chromosome. Homologous chromosomes aline together to make the crossing-over possible, the stage where they interchange their parts.
The whole set of chromosomes is present in prophase 1. The reduction occurs later.
So if the germ cell has 50 chromosomes, the same 50 will be visible during prophase 1. DNA has already been replicated during the S stage of interphase.
Now differentiate between laws and theories
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Answer:
laws are so far permanent and can be amended, other-wise they can't be removed
theories, are different, theories are just theories that are ready to become something like a law, it is still in testing mode, it is like a bill in terms of law and has a possibility to become a passed law, just needs more hypothesis's and conclusions
Explanation:
law = law that is passed
theories = bills in law
Which of these occurs in the first trimester of human pregnancy?
A. The fetus accumulates fat under its skin.
B. The fetus's lungs become fully developed.
C. The fetus is able to move its limbs.
D. The fetus becomes medically viable.
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Answer:
i think its probably A
Explanation:
the first trimester is when the fetus enters a stage of rapid development. forming most organs, facial features, skeletal tissue, and limbs. So its either A or B. But i dont think the lungs are fully developed yet so i would choose A. hope this helped
Luke was Isked to find the median of the following
numbers:
16, 24, 12, 7, 30, 11,22
The work below shows the steps he used.
X X 16 22 24 30
What error did Luke make?
O He forgot to put the numbers in order first.
O He crossed off the low and high pairs incorrectly.
O He left out a number when putting the numbers in
order.
O He did not make an error.
16 + 22 = 38
2 2
16 22 = 38
19
Answers
Answer:
He left out a number when putting the numbers in order.
Explanation:
To find the median of a set of numbers, first arrange the numbers in order from least to greatest. Then begin crossing numbers of from each side at the same time.
Luke did not cross numbers off from each side, but only crossed them off from the left side. He also skipped a number, given there are only 2 "X's."
The list should look like so:
7, 11, 12, 16, 22, 24, 30
There should be three numbers before 16, not two as he has listed.
water enters a long vurvykar tube at a eman tempreture taht is lower than the tine surface temperatire. The curve that most closely describes the mean tempretire of the fluid as a function of
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Answer:
The curve that most closely describes the mean tempretire of the fluid as a function of position along the tube.
Explanation:
Hello. Your question is presenting very confusing words, however, through the context of the question as a whole, it is possible to see that you are saying that the water that enters a circular tube has a lower temperature than the temperature presented by the surface of the tube . In this case, if you are going to present a graph about this, it is important that this graph presents a curve that shows the relationship between the average water temperature as a function of the position of the water along the tube. This graph will be similar to the graph shown in the attached figure below.
Birds differ from their closest relatives, the reptiles, in what ways?
(choose all that apply)
the bones of reptiles are too lightweight to permit flight
birds are capable of powered flight, while some reptiles can glide
birds have feathers, reptiles have scales
only the birds lay eggs on land; the reptiles can only lay their eggs in water
the reptiles have a series of internal air sacs that allow a very efficient extraction of oxygen
birds are endothermic, while reptiles are generally ectothermic
1 pts
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Answer:
birds have feathers, reptiles have scales
birds are endothermic, while reptiles are generally ectothermic
Explanation:
The main difference between birds and reptiles is that birds have feathers on their body while on the other hand, reptiles ahve dry skin and have scales. Reptiles are ectotherms, while birds are endotherms. An ectotherm relies on its external environment to regulate the temperature of its body whereas Endotherms are able to regulate their body temperatures by producing heat within the body.
A gene is
1. segment of DNA
2. All of our DNA
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Answer:
segment of DNA
Explanation:
they contain the code for a specific protein that functions in one or more type of cells in a body
Answer:
segment of DNA
Explanation:
There are different parts of DNA.
One of them is the gene.
Have a great day.
Dehydration synthesis leads to WICH formation
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Answer:
Polymers...........
Explanation:
a) Identify where exocytosis begins in this pathway.
How is the protein transported out of the cell?
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Answer:
Protein cargo moves from the ER to the Golgi, is modified within the Golgi, and is then sent to various destinations in the cell, including the lysosomes and the cell surface. The Golgi processes proteins made by the endoplasmic reticulum (ER) before sending them out to the cell.
explanation:
correct me if I'm wrong (◍•ᴗ•◍)
What type of frog or toad is this
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Answer:
Explanation:
scaled reptiles
Answer:
this would be a black spot toad i think i am not 100 percent sure but its most probably this is a black spot toad
Explanation:
hope this help :]
Who was newton please explain fast
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Newton was a scientist in the 1600's who discovered gravity. He also discovered the laws of physics.
answer:
the man who discovered gravity by an apple falling on his head
hope this helps :)
Why do some people argue that scientists should not use embryonic stem cells in medical research?
A. They think research conducted on these stem cells is not applicable to adults.
B. They think the use of these stem cells is too expensive.
C. They think the use of these stem cells is the same as ending a life.
D. They think research conducted on these stem cells is too difficult.
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[tex] \huge \rm \pink{answer}[/tex]
D. They think research conducted on these stem cells is too difficult.
They argue because they think the use of these stem cells is the same as ending a life. Therefore, option C is correct.
This viewpoint is rooted in ethical and moral concerns. Embryonic stem cells are obtained from human embryos, usually from unused embryos created during in vitro fertilization (IVF) procedures. Opponents argue that using these stem cells for research purposes involves the destruction of potential human life since the embryos are destroyed in the process of harvesting the cells.
The ethical debate surrounding embryonic stem cell research centers on the question of when life begins and whether it is ethically justifiable to use human embryos for scientific purposes.
Learn more about stem cells, here:
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