NASA help to distinguish genetic factors from environmental ones by
analyzing changes experienced in one twin on Earth and the other in space.
NASA planned to study how environmental conditions affects the health
conditions of humans. They decided to use twin brothers because of them
sharing the same genetic makeup.
One of them is taken to space and the other is left on earth and their health
are studied to ascertain any change as a result of the environmental change
to that of space.
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how the development of the microscope played an important part in helping to convince people that mendel was right
The microscope can be used to demonstrate the segregation of chromosomes during cell division. The law of segregation of characters is a Mendel's Law.
Each allele or gene variant is located at a specific chromosome location known as a gene locus.
The Law of Segregation indicates how one offspring receives one allele from each parent for each locus in a diploid organism.
The development of microscopy confirmed the idea that offspring receives one allele (which is located at a specific chromosome) from each parent for each gene locus.
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A disease-causing bacteria successfully enters your body, making it past the first and second lines of defense. Which barrier will then act on the bacteria? chemical physical biological electrical.
Answer:
The correct answer is biological.
Explanation:
When any pathogen invades the body, it has to pass several lines of defence. The first barrier is the skin and mucous membrane which is a physical and chemical barrier. The second line of defence is the non-specific response by macrophages, neutrophils and interferon. After crossing these two barriers the third line of defence comes into action in which, the B- cells and T-cells act specifically on the pathogen and destroy it.
Answer:
[tex]\huge\boxed{\sf Biological}[/tex]
Explanation:
When first and second line of defense is passed by the bacteria, the third line of defense will come into action which is a biological barrier which includes antigen which are anti-bodies generating substances.
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807if something starts to get smaller which law of motion is it
Answer: second law
Explanation: second law is about force = mass acceleration
The constitutional convention began as what ?
Which cellular process would be affected first if the structure labeled 3 were
destroyed?
Answer:
Photosynthesis
Explanation:
asked my teacher
how long does better than bouillon last after opening
Since the ingredients include ground meat and vegetables, Better than Bouillon must be stored in the refrigerator. But don't worry that it will go bad quickly — it has about an 18-month shelf life from the time it's opened.
Enlist any five properties of metals.f
our points
Answer:
1. Hard
2. Malleable
3. Ductile
4. Good electrical conductor
5. High melting point
Construct a Venn diagram that compares and contrasts sexual and asexual reproduction.
Include the following phrases:
haploid (n)
diploid (2n)
gamete
somatic
mitosis
meiosis
cell division
chromosomes separate
genetically identical
genetically different
The Venn diagram makes a comparison between categories. Intersection: Cell division/Asexual: diploid, somatic, mitosis, genetically identica/Sexual: haploid, gamete, meiosis, chromosomes separate , genetically different.
------------
A Venn Diagram is represented as two or more circles with some degree of superposition between them. It is used to make comparisons expressing similitudes and differences between things.
Each circle represents a category -in this example, sexual and asexual reproduction-.
The superposed area is named intersection and shows things in common between the two categories.
We already know that sexual reproduction occurs by the process of meiosis, while asexual reproduction occurs by mitosis.
In superior organisms, there are two types of cells: Somatic cells and germ cells.
The somatic cells are diploid (2n), meaning that each cell has a pair of equal chromosomes. The somatic cells are all the body cells except for the sexual ones, and they reproduce by the process of mitosis.
In somatic cells, one of the sets of chromosomes is inherited from the maternal side, while the other homologous set of chromosomes is inherited from the paternal side. Hence, the number of chromosomes in these double sets of the somatic cells is diploid, 2n.
Mitosis is a process through which, from a diploid somatic cell (2n), two identical daughter diploid cells (2n) are produced.
First, occurs duplication of the cell content, and then the separation into two new cells happens.
Germ cells suffer mitosis and meiosis.
Through meiosis, germ cells produce gametes, called sperm and egg cells, through the gametogenesis process.
Gametes are haploid (n) with half the number of chromosomes that might be found in the somatic cells.
During gamete formation, the pairs of homologous chromosomes separate after crossing over. Then, sister chromatids also separate. The result is the formation of four gametes.
Each gamete has different information from the combination of homologous chromosomes belonging to the father and to the mother.
Gametes' destiny is to merge in the process of fecundation, during which a new diploid cell called zygote emerges through fertilization.
The zygote is a complete cell that suffers successive mitosis to form the new organism.
Venn Diagram
Intersection area: Cell divisionAsexual: diploid, somatic, mitosis, genetically identicalSexual: haploid, gamete, meiosis, chromosomes separate , genetically different.--------------------------------------------------------------------------------------------------------
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Which ion/molecule in the saliva allows you to taste sugar as sweet? A. Hydrogen ions B. Sodium ions C. Glucose D. Alkaloid molecules
Answer:
C. glucose
Explanation:
the presence of energy-rich carbohydrates, such as glucose, which increases the hedonic tone of food and strongly influences our eating behavior.
What is the most important characteristic about the Earth allowing it to support life? *
the options are:
an atmosphere with oxygen
seasons
a temperature range that is not too hot or cold.
Answer:
an atmosphere with oxygen
seasons
Can somebody help me with my phycology
In order for a muscle cell to contract, sodium ions (Na+) must be removed from
the cell and potassium ions (K+) must enter the cell. Both of these lons travel
against the cell's concentration gradient. This process is most likely achieved
througn-
A.Simole diffusion across the cell membrane using no energy
b. A channel protein using no eneray
C. A protein pump using energy
d. A channel protein using energy
Help asab
A cross country runner runs 8 km in 2 minutes. What is his speed?
The speed of the cross country runner is equal to 4 km/min.
Given the following data:
Distance = 8 km.Time = 2 minutes.To determine the speed of the cross country runner:
Speed can be defined as the distance covered by an individual per unit time and it can be measured in kilometer per minutes (km/min).
Mathematically, speed is given by the formula;
[tex]Speed = \frac{distance}{time}[/tex]
Substituting the given parameters into the formula, we have;
[tex]Speed = \frac{8}{2}[/tex]
Speed = 4 km/min.
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5. One reason that viruses are harmful to living cells and classified as pathogens is that they-
A cause organisms to produce daughter cells through the process of mitosis
B stimulate the production of ATP in mitochondria within host cells
C damage the cells used in the production of new virus particles
Dreduce the amount of cholesterol in the blood of people with heart disease
what is the potential energy of a 10kg object sitting on a 2.5m high cliff
Answer:
245.1663 Joules
Explanation:
Use the potential energy formula which is U=mgh
Where m=mass in Kg
g=gravitational acceleration: 9.80665 m/s^2
and h=height in meters
Which measurement would changif you traveled from Earth to the moon?
A.your weight
B.your density
C. your mass
D.your height
Answer:
A. your weight
Explanation:
B, C, and D are all fixed by the number of atoms in your body. Weight is determined by the gravitational pull which would be less on the moon.
Oxygenated blood exits the heart ______________, whereas oxygenated blood enters the ______________ of the heart
Explanation:
if a plant is not green (does not contain chlorophyll) can it do photosynthesis? why or why not?
Answer:
No, it cannot carry out photosynthesis because the plant will not be able to absorb light as it does not have chlorophyll.
Explaination:
Chlorophyll in plants is used for absorbing energy from light. And, in photosynthesis, light/sunlight is one of the main factors needed, so as the plant cannot absorb light, photosynthesis can't take place.
Which of the following best describes hair? Hair is made of mostly tightly packed living cells. Hair does not help control body temperature. Hair growth occurs in the hair follicle. Hair grows at 2. 5mm a month.
Answer:
hair growth occurs in the hair follicle
Explanation:
the other ones aren't correct
If a cell that is about to divide has 22 chromosomes how many chromatids does it have? How many centromeres does it have?
44 chromatids 2 centromeres, If a cell that is about to divide has 22 chromosomes.
What are chromosomes?In the synthesis phase, the number of chromatids doubles while the number of chromosomes remains constant. Although the number of chromatids is unaffected, anaphase doubles the number of chromosomes.
Depending on whether or not the DNA has replicated and when the sister chromatids split, the chromosome changes during the cell cycle.
Meiosis I and Meiosis II are the two division cycles that occur during a meiotic cell division. Since the genetic material duplicates during the S phase of meiosis I, there will be 2n chromosomes during metaphase I.
Therefore, if a cell that is about to divide has 22 chromosomes it have 44 chromatids and 2 centromeres.
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Which statement describes an important role of carbon dioxide in Earth's atmosphere?
Animals breathe carbon dioxide.
O Plants use carbon dioxide to make food.
O Carbon dioxido helps animals make proteins.
Carbon dioxide forms clouds that produce rain
Answer:Plants use carbon dioxide to make food
Explanation: Carbon-dioxide plays a very important role in sustaining life on Earth.
Plants use carbon-dioxide and water for photosynthesis in presence of sunlight and chlorophyll to produce food and oxygen.
CO₂ + H₂O → O₂ + glucose (food)
This food is consumed by the animals and oxygen is used for respiration. Animals use energy from the food to do work and exhale back carbon-dioxide.
What are some human activities that change the environment?
Humans impact the physical environment in many ways: overpopulation, pollution, burning fossil fuels, and deforestation. Changes like these have triggered climate change, soil erosion, poor air quality, and undrinkable water
Other answers:
Overpopulation.
Pollution.
Global Warming.
Climate Change.
Genetic Modification.
Ocean Acidification.
Water Pollution.
Deforestation.
Which statement describes functions of anti bodies
Answer:
Explanation:
Antibodies have three main functions: 1) Antibodies are secreted into the blood and mucosa, where they bind to and inactivate foreign substances such as pathogens and toxins (neutralization). 2) Antibodies activate the complement system to destroy bacterial cells by lysis (punching holes in the cell wall).
which of the following organism does not require sunlight to live
Answer: Bacteria
Explanation:
Answer:
Bacteria are organism's that don't need any light or oxygen to survive
Explanation:
what kind of punch do a jelly fish like
Answer:
a smack
Explanation:
Answer:
Jelly fish like a smack punch.
Explanation:
The mystery of what kind of punch a jellyfish like matched in beautifully with the show's theme - and explained why they're dubbed Scorpion. Scorpions are strongly loyal to the other members of their cyclone group. As they solve their cases, the squad surely creates a ruckus! Scorpions, like other scorpions, have very hard shells and are disliked by many people. A smack is a bunch of jellyfish, and the answer to the riddle is a clever play on the term punch. And, of course, this is what the marines called the team at the start of the show when they intended to make fun of them.
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the process of protein formation directed by mrna is called
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Functional groups
Answer: I don't have a definitive answer for this question but I do have a helpful explanation.
Explanation: Try to find out what each letter means and organize the elements by how they connect to each other. If you don't know you can research to find a diagram that can help show you how to connect these functional elements. You could try searching how do you find the elements of HOH in a diagram.
do aquatic animals living underwater can hear the sound produced outside the surface if water
Answer:
Believe it or not mammals like seals and pinnipeds otters and polar bears can but underwater animals hear very poorly
Explanation:
what is an accessory organ of the plant used in sexual reproduction
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I am just a teen who needs some help with homework. :)
This is my question:
What is the rarest eye colour in the world? Please help, it's due today.
Answer:
Green eyes
Explanation:
The production of melanin in the iris is what influences eye color. More melanin produces a darker coloring, while less makes for lighter eyes. Green eyes are the rarest, but there exist anecdotal reports that gray eyes are even rarer.
The rarest eye color in the world is green, only 2% of the population in the world have green eyes. To find out more about the list.....
1. Green eyesOnly 2% of people in the world are believed to have this eye color. It is most easily found in northern and Southern Europe and Western Asia.
2. Amber eyesThey are reddish-brown, with a golden and coppery undertone. Among the clear and beautiful eyes in the world, and according to the survey, the most iris, all eyes and beautiful in the world are according to the study, all eyes are rare and specific.
3. Red or violet eyeIt is generated by the body thanks to some genetic changes. The most common is albinism, a disease that lowers melanin levels. Because of this, the hair and eyes can be distinguished.
With this information, we can conclude that there are several eye colors, but the most rare is the color green.
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