Answer:
a) DNA fragments associated with histone proteins are all multiple in length (i.e., 260 bp, 520 bp, 780 bp, etc), thereby suggesting the presence of a pattern of organization in the chromatin
b) it suggests that each unit of organization (ie, each nucleosome) consists of 260 bp associated with chromatin proteins
Explanation:
The nucleosome is considered as the basic unit of chromatin. A nucleosome consists of approximately two turns of DNA wrapped around a core of eight histone proteins (i.e., a histone octamer). The histone octamer consists of two copies of each of the histones H2A, H2B, H3, and H4. Moreover, the nucleosomes are connected together by linker DNA sequences which vary between 10 and 100 bp in length.
A microscope has a 4x ocular lens and a 10x objective, what is this microscope's
total magnification?
4x
14x
40x
400x
Answer:
It would be 40x
Explanation: The explanation is that 10x and 4x is 40x on a microscope unless you are working with a different type of microscope with the 50x ocular lens
Sleep is an important need for people, explain sleep and four
different stages of sleep.
Answer:
Stage 1 non-REM sleep is the changeover from wakefulness to sleep. ...
Stage 2 non-REM sleep is a period of light sleep before you enter deeper sleep. ...
Stage 3 non-REM sleep is the period of deep sleep that you need to feel refreshed in the morning. ...
REM sleep first occurs about 90 minutes after falling asleep.
Explanation:
Sleep is an important part of your daily routine—you spend about one-third of your time doing it. Quality sleep – and getting enough of it at the right times -- is as essential to survival as food and water. Without sleep you can’t form or maintain the pathways in your brain that let you learn and create new memories, and it’s harder to concentrate and respond quickly.
Stages of sleepstage 1 non-REM sleep is the changeover from wakefulness to sleep. During this short period (lasting several minutes) of relatively light sleep, your heartbeat, breathing, and eye movements slow, and your muscles relax with occasional twitches. Your brain waves begin to slow from their daytime wakefulness patterns.
Stage 2 non-REM sleep is a period of light sleep before you enter deeper sleep. Your heartbeat and breathing slow, and muscles relax even further. Your body temperature drops and eye movements stop. Brain wave activity slows but is marked by brief bursts of electrical activity. You spend more of your repeated sleep cycles in stage 2 sleep than in other sleep stages.
Stage 3 non-REM sleep is the period of deep sleep that you need to feel refreshed in the morning. It occurs in longer periods during the first half of the night. Your heartbeat and breathing slow to their lowest levels during sleep. Your muscles are relaxed and it may be difficult to awaken you. Brain waves become even slower.
REM sleep first occurs about 90 minutes after falling asleep. Your eyes move rapidly from side to side behind closed eyelids. Mixed frequency brain wave activity becomes closer to that seen in wakefulness. Your breathing becomes faster and irregular, and your heart rate and blood pressure increase to near waking levels. Most of your dreaming occurs during REM sleep, although some can also occur in non-REM sleep. Your arm and leg muscles become temporarily paralyzed, which prevents you from acting out your dreams. As you age, you sleep less of your time in REM sleep. Memory consolidation most likely requires both non-REM and REM sleep.
The concept of induced fit refers to the fact that a. Substrate binding may induce a conformational change in the enzyme, which them brings catalytic groups into proper orientation. b. When enzymes bind substrates, the substrates are bought into proximity to make a chemical reaction favorable. c. When a substrate binds to an enzyme, the enzyme induces a loss of water from the substrate. d. When a substrate binds to an enzyme, free energy is released due to non-covalent interactions.
Answer:
Option A, Substrate binding may induce a conformational change in the enzyme, which them brings catalytic groups into proper orientation.
Explanation:
Induced fit concept refers to introduction of continuous change of enzyme conformation on substrate binding. This change in the shape of enzyme either inhibit or enhance the activity of enzyme. This makes the enzyme catalytic and hence lower the activation energy thereby increasing rate of reaction.
A solution is modified in doing so the pH changes from 8 to 4. This will make the actual Concentration of hydrogen ions Change by a factor of?
A.1000
B.100
C.10000
D.4
E.10
12. Which of the methods of generating electricity does NOT use alternative energy
resources?
a. Burning coal in a power plant
b. Turbines spinning in dam
c. Solar panels taking in light energy
d. Drilling wells to reach hot rocks deep inside the earth
Answer:
i think its A. burning coal in a power plant
Explanation:
sorry if im wrong but please let me know if this is correct or not
The method of generating electricity that does not use alternative energy resources is burning coal in a power plant.
What are alternative energy resources?Alternative energy resources are eco-friendly resources that can be used to produce energy.
These are renewable resources and can not be extinct.
These resources do not pollute the earth.
Examples are windmills, solar panels, hydropower, etc.
Thus, the correct option is a. Burn coal in a power plant.
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When you flex your knee, where are the fulcrum and the load? Where is the muscle that provides the effort located?
Explanation:
the fulcrum is the knee joint
the load is probably the radius and ulna with the muscle on it
while the effort could be tendons and the muscle on the femur
Which is NOT a part of cell theory?
A. The basic unit of life is a cell.
B. All cells are produced from other living cells.
C. All cells need light to live.
D. All organisms are made of cell.
The following chemical equation shows the combustion of ethane. Balance the equation by filling in the coefficients.
Answer:
2 C2H6 + 4 O2 → 2 C + 2 CO2 + 6 H2O
Explanation:
2 C2H6 + 4 O2 → 2 CO2 + 6 H2O is the balance equation for the combustion of ethane. In the question, the equation for combustion of methane is unbalanced i. e. C2H6 + O2 → CO2 + H2O so by putting coefficient 2 in front of ethane, 4 in front of oxygen, 2 in front of carbondioxide and 6 in front of water which can balance the unbalanced equation for combustion of ethane
What is a mold? in fossils
Which is NOT an example of a fossl fuel
O Coal
O Oll
O Water
O Natural gas
Please help ASAP
pls help will give brainliest
Answer:
The first one is Photosythesis and the second one is Respiration
Explanation:
PLEASSEEE HELP ASAP THANKS
Answer:
1,3 and 5.............
What sort of receptor do skeletal muscle cells use to receive signals from somatic lower motor neurons?
a. Nicotinic
b.Muscarinic
c.Adrenergic
d.Mechanoreceptive calcium channels
Answer:
C
Explanation:
Skeletal muscle cells use Adrenergic receptor to receive signals from somatic lower motor neurons ; ( C ) Adrenergic
Skeletal muscles are organs of the muscular system found in vertebrates. they are attached to the skeletal bones through tendons. they all posses the longest of all muscles cells as well.
Skeletal muscles receive signals from somatic lower motor neurons through the Adrenergic receptor found in all cell and tissues .
Hence we can conclude that skeletal muscle cells use Adrenergic receptor to receive signals from somatic lower motor neurons.
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1.) A person walks 12.5 km in 1.9 h. What is the person's
average velocity in km/h and m/s?
Answer:
1. 6.56 km/hr
2. 1.83 m/s
Explanation:
The average velocity/speed can be calculated using the formula;
Average speed/velocity = distance/time
According to the information provided in the question, distance = 12.5km, time = 1.9h
Average velocity in km/hr = 12.5/1.9
= 6.578
= 6.56km/hr
However, in order to calculate the average speed in m/s, we have to convert distance in km to m, and time in hour to seconds.
1km = 1000m
12.5km = 12.5 × 1000
= 12500m
1 hour = 3600seconds
1.9hours = 1.9 × 3600
= 6840seconds
Average velocity = 12500/6840
= 1.827
= 1.83m/s
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Which animal will use a hollowed-out tree stump as a home?
O A) a beaver
OB) a bear
OC) an eagle
OD) a rabbit
plz answer ASAP will get ten points
Answer:
the 2nd and 4th
Explanation:
they contain more than one molecule due to them being different elements
In a separate study, 68 rock pocket mice were collected from four different, widely separated areas of dark lava rock. One collecting site was in Sonora, Mexico. The other three were in Chihuahua, Mexico. Dr. Nachman and colleagues observed no significant differences in the color of the rocks in the four locations sampled. However, the dark-colored mice from the three Chihuahua locations were slightly darker than the dark-colored mice from the Sonora population. The entire Mc1r gene was sequenced in all 68 of the mice collected. The mutations responsible for the dark fur color in the Sonora mice were absent from the three different populations of Chihuahua mice. No Mc1r mutations were associated with dark fur color in the Chihuahua populations. These findings suggest that adaptive dark coloration has occurred at least twice in the rock pocket mouse and that these similar phenotypic changes have different genetic bases.
Complete question:
In a separate study, 68 rock pocket mice were collected from four different, widely separated areas of dark lava rock. One collecting site was in Sonora, Mexico. The other three were in Chihuahua, Mexico. Dr. Nachman and colleagues observed no significant differences in the color of the rocks in the four locations sampled. However, the dark-colored mice from the three Chihuahua locations were slightly darker than the dark-colored mice from the Sonora population. The entire Mc1r gene was sequenced in all 68 of the mice collected. The mutations responsible for the dark fur color in the Sonora mice were absent from the three different populations of Chihuahua mice. No Mc1r mutations were associated with dark fur color in the Chihuahua populations. These findings suggest that adaptive dark coloration has occurred at least twice in the rock pocket mouse and that these similar phenotypic changes have different genetic bases.
How does this study support the concept that natural selection is not random?
Answer:
The study supports the concept that natural selection is not random because in different areas with the same or very similar environmental characteristics, the same phenotype was produced by different types of mutations.
Explanation:
All of the sampled animals are inhabiting dark substrate. Probably animals needed to camouflage to survive. Natural selection must have driven them to produce dark color, similar to the substrate color. So animals from the different regions suffered different mutations that drove them to have almost the same dark fur color. The environmental condition is favoring the same phenotype.
You have been studying two Hippogriff traits as a senior graduation project at Hogwarts (because you are magical), beak size (big beaks, B, are dominant to small beaks, b) and feather color (brown feathers, F, are dominant to white feathers, f). You mate two brown, big-beaked Hippogriffs and obtain the following results: 15 of the baby Griffs are brown and big-beaked; 4 of the baby Griffs are white are big-beaked; and 1 of the baby Griffs is white and small-beaked. What are the genotypes of the parent Hippogriffs
Answer:
BbFf is the genotype of parent Hippogriffs
Explanation:
Given -
Big beaks, B, are dominant to small beaks, b.
Brown feathers, F, are dominant to white feathers, f.
Two brown, big-beaked Hippogriffs are mated to produce 15 brown and big-beaked; 4 white and big-beaked; and 1 white and small-beaked offspring
The genotype of parents is BbFf
Select the term that best fits the following definition: Tells what elements
a compound contains and the number of those atoms *
O Covalent Bond
O lonic Bond
O Compound
O Chemical Formula
A scientist found an igneous rock that contained pyroxene and plagioclase. What would best help the scientist to correctly classify the rock?
A. Identifying the rock as either intrusive or extrusive
B. Observing the color of the rock based on minerals
C. Knowing the additional minerals found in the rock
D. Determining the amount of pyroxene in the rock
What is the optimal pH that this enzyme functions at? And What is the optimal temperature that this enzyme functions at?
Answer:
Optimum Temperature is 35°C
Optimum PH is 7.0.
Explanation:
The optimum temp of enzymes is 20-35°c. They become inactivated at very low temperature and denatured (destroyed) at very high temp i.e. greater than 45°C. Low molecular weight enzymes are comparatively more heat stable.
The optimum pH of most enzymes is pH 7.0 (neutral pH).
What is one of the chief alms of water conservation?
Answer:
gdk
and got tooka killed Explanation:
What would happen to Earth's climate if we had no moon, and why?
Answer:
The tilt creates what we know as seasons and changing weather. Without the pull of the moon, this tilt would change.
Explanation:
Either the tilt would become extreme, leading to extreme and severe seasons, or the tilt would decrease, and we would see almost no seasons at all. The moon influences life as we know it on Earth.
Answer: Because It is the pull of the Moon's gravity on the Earth that holds our planet in place. Without the Moon stabilising our tilt, it is possible that the Earth's tilt could vary wildly. It would move from no tilt (which means no seasons) to a large tilt (which means extreme weather and even ice ages).
The tilt creates what we know as seasons and changing weather. Without the pull of the moon, this tilt would change. Either the tilt would become extreme, leading to extreme and severe seasons, or the tilt would decrease, and we would see almost no seasons at all. The moon influences life as we know it on Earth. Hope this helps have a awesome day/night❤️✨Explanation:
why is reproductive isolation insufficient to define a species?
A. This definition overlooks artificial preproduction, such as in zoos
B. Reproductive isolation doesn't take outgroups into account
C. This definition excludes organisms that reproduce asexually
D. Reproductive isolation can be accomplished in a variety of ways
The correct option is (c) This definition excludes organisms that reproduce asexually.
Asexual reproduction is also possible in bacteria, yeast, fungi, plants, and other organisms. Most frequently, yeast proliferate by budding. Plants and fungi both use spores for asexual reproduction. Additionally, plants are capable of reproducing asexually by vegetative propagation.Numerous eukaryotic creatures, such as plants, animals, and fungus, are also capable of asexual reproduction. Parthenogenesis, the most prevalent type of asexual reproduction in vertebrates, is frequently employed as an alternative to sexual reproduction when sexual reproduction isn't an option.What are the 4 types of asexual reproduction?Asexual reproduction includes fission, budding, fragmentation, and parthenogenesis, while sexual reproduction is achieved through the combination of reproductive cells from two individuals.
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Helppppppppppppppppppppppppp
Answer:
agriculture
Explanation:
Slash-and-burn agriculture, method of cultivation in which forests are burned and cleared for planting. Slash-and-burn agriculture is often used by tropical-forest root-crop farmers in various parts of the world and by dry-rice cultivators of the forested hill country of Southeast Asia
The first stage of the cell cycle during which the cell matures and prepares to divide and copies
its DNA; The stage the cell stays in the most?
The cell multiplies and creates a copy of its DNA during interphase. In the mitotic (M) phase, the cell divides into two new cells by dividing its cytoplasm and DNA into two sets.
What is the main role of interphase stage of cell cycle?A cell consumes the bulk of its time in what is known as interphase, where it creates, duplicates its chromosomes, and acquires available to split. The cell then moves interphase, goes direct mitosis, and completes dividing.
The cell multiplies and the nuclear DNA is duplicated during interphase. The mitotic phase immediately follows interphase.
Chromosomes that have been duplicated are separated and distributed across daughter nuclei during the mitotic phase. Usually, the cytoplasm is divided as well, producing two daughter cells.
Therefore, The first stage and the stage the cell stays in most is Interphase.
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In one of these systems, the prey are very large animals and the predators are verysmall animals, such as elephants and mosquitoes. Thus it takes many predators toeat one prey, but each prey eaten is a tremendous benefit for the predator population.The other system has very large predators and very small prey. Determine whichsystem is which and provide a justification for your answer.
Answer:
Due to its size and feeding requirement.
Explanation:
In the forest ecosystem, many lions feeds on one deer or buffalo because the food is in large amount and this food is enough to fulfill the requirements of that lions so we can say that many predators eats one prey while on the other hand, there are some predators that feeds on many prey at one because they are small in size and one prey did not fulfill their requirement so that's why the predator feeds on many preys. Fox feeds on many mice is the example of one predators feed on many prey.
Which factor DOES NOT affect the rate of diffusion *
O Particle Size
Temperature
O Concentraxon Gradient
O Particle Color
What factor causes global wind patterns
Answer:
the Coriolis effect
Explanation:
the earths rotation causes wind also known as the coriolis effect
Answer:
unequal heating of Earth's surface by the Sun
Explanation:
What is true of all body cells except sex cells?
Each cell type carries chromosomes and genes that identify it as that specific type of cell. For example, skin cells have different chromosomes and genes than muscle cells.
While each cell in the body contains the same number of chromosomes, each cell type has different genes along those chromosomes.
While each cell type in the body contains the same kinds of genes, they are organized on different chromosomes depending on the cell type.
Each body cell contains the same number and kinds of chromosomes for that organism. The chromosomes contain the same number and kinds of genes for that individual.
Explanation:
Each cell type carries chromosomes and genes that identify it as that specific type of cell. For example, skin cells have different chromosomes and genes than muscle cells.