In one day, a zebra eats 10 kg of grass. A lion kills and eats the zebra. About how much of the energy contained originally in the grass is usable by the lion?

A.) 0.1 kg

B) 10 kg

C.) 5 kg

D.) 1 kg

solid leaves (MM),

normal height (DD),

smooth skin (PP).

recessive TRAITS

leaves (mm),

dwarf height

(dd), and

peach skin (pp)

Answer:

Explanation:

For muscle contraction to occur it is necessary that the brain first sends signals to motor neurons that will quickly establish contact with muscle fibers.

At that time, the axons close to the muscle fibers will lose the myelin sheath, as a result of which, the axons will dilate forming a kind of plaque called the motor plaque. The main function of this motor plate is to allow the motor nerves to connect to the muscles.

Simultaneously, the nervous impulse will reach the aconic terminations of the motor nerves. This will cause the release of acetylcholine over the muscle fibers causing an action potential to occur. After that, the actin and misin filaments contract, as a result the sarcomere becomes decreased and as it decreases it causes muscle contraction.

In summary, muscle contraction happens as follows:

Muscle contraction is a complex process beginning with the release of calcium ions by a nerve cell. This leads to the activation of proteins actin and myosin, which then overlap completely. This activity shortens the sarcomere, resulting in muscle contraction, after which the sarcomere relaxes.

The process of muscle contraction involves several steps. Here is the order of these steps from first (1) to last (5):

Calcium ions are released by a nerve cell. An electrochemical signal from a nerve cell triggers the release of calcium ions.

Actin and myosin are activated. The released calcium ions bind to the proteins called troponin and tropomyosin on the actin filament, exposing the binding sites and enabling myosin heads to attach.

Actin and myosin overlap completely. The myosin heads temporarily bind to the actin filament, resulting in cross-bridge formation and filament sliding.

The sarcomere shortens. The sliding of filaments continues leading to the shortening of the sarcomere and muscle contraction.

The sarcomere is relaxed. Once calcium ions are removed, actin-binding sites are shielded again, resulting in muscle relaxation.

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The first colorimeter is consistent but is not accurate; with an error of -5.  It cannot be used to provide accurate reading.

U can conclude the second colorimeter to be accurate.

Answer:

Explanation:

The readings from the two colorimeters have the following implications:

1. The first colorimeter consistently showed readings that were five points lower than the actual reading. This suggests that there is a systematic error or calibration issue with this colorimeter. A systematic error is an error that occurs consistently and affects all measurements in the same way. In this case, the colorimeter consistently underestimates the color intensity by five points. To obtain accurate results, the scientist should adjust the readings from this colorimeter by adding five points to compensate for the systematic error.

2. The second colorimeter provided readings that were the same as the actual reading. This implies that the second colorimeter is properly calibrated and does not have any systematic errors. It provides accurate readings without any need for adjustments.

In summary, the first colorimeter consistently underestimates the color intensity by five points, while the second colorimeter provides accurate readings. To obtain accurate results, the scientist should adjust the readings from the first colorimeter by adding five points.

If the d subshell has between 1 and 9 electrons, it is said to be partially filled if at least one d orbital is half-filled or vacant and at least one d orbital is full.

Any metal that produces one or more stable ions with partially filled d orbitals is said to be transitional. An element that has incomplete d subshells on its atoms or that can produce cations with incomplete d subshells is referred to as a transition element.

According to the aufbau principle, an atom's electrons must first occupy its lowest-energy atomic orbitals before moving on to its higher-energy counterparts.

Zn, Cd, and Hg have (n-1) “d(10)ns” electron configurations in their atoms, while their most stable simple ions, “M”(2+), have (n-1) “d (10)ns” electron configurations. So neither their atoms nor their simple ions have partially filled d-orbitals.

Therefore, it is called Transition elements are the elements called that have partially filled d sublevels.

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Answer:

darkness; light

Explanation:

Made by the body, melatonin not only regulates bedtime but also helps repair our cells exposed to stress, pollution and other harmful elements. It is a powerful antioxidant and fights free radicals that attack the body. In sync with the end of the day and the light, it is now released to prepare the body for the night. This is because the release of melatonin is stimulated by darkness and inhibited by light.

Melatonin release is stimulated by darkness and inhibited by light.

Melatonin release, a hormone that plays a critical role in regulating the sleep-wake cycle, is influenced by environmental light conditions. It is stimulated by darkness and inhibited by light.

In the absence of light, particularly during the evening and nighttime, the pineal gland, located in the brain, is stimulated to produce and release melatonin. This surge in melatonin levels helps signal to the body that it's time to prepare for sleep.

Conversely, exposure to light, especially in the morning and daytime, suppresses melatonin production. The pineal gland receives signals from the eyes regarding ambient light levels, which in turn helps regulate the body's circadian rhythm. This light-dependent control of melatonin secretion supports alertness and wakefulness during daylight hours.

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The true statements are:

The heme group is a crucial component of myoglobin and hemoglobin, playing a central role in oxygen binding and release. Consisting of a porphyrin ring with an iron (Fe) ion at its center, the heme group exhibits several characteristics that contribute to its function.

Firstly, the heme group comprises four pyrrole rings linked via methene bridges, creating a conjugated system. This conjugation is essential for the efficient absorption and release of oxygen. The iron at the center of the heme group can form six bonds, with the fifth bond established with an imidazole ring of a histidine and the sixth with oxygen during oxygen binding.

The globin chains of myoglobin and hemoglobin surround and protect the heme group, preventing the oxidation of Fe2 to Fe3. This protection is crucial, as Fe3 irreversibly binds oxygen, interfering with the oxygen-carrying capacity of these proteins.

The cooperativity of oxygen binding in hemoglobin is facilitated by electronic interactions between heme groups. Hemoglobin exhibits a transition between the relaxed (R) state, which has higher oxygen affinity, and the tense (T) state with lower affinity. This transition is influenced by the length of Fe–Nporphyrin bonds in the heme group, with the T state having longer bonds and lower affinity for oxygen.

Additionally, it's important to note that hemoglobin contains four heme groups, each capable of binding one molecule of oxygen. Together, these characteristics highlight the intricate and finely tuned nature of the heme group, allowing myoglobin and hemoglobin to effectively transport and release oxygen in response to varying physiological conditions.

Complete question:

Identify the true statements regarding the heme group of myoglobin and hemoglobin. ( Hint: there are 5 correct answers)

Aline's mother can reassure her by explaining that BMI, or Body Mass Index, is just a simple way for the nurse to check whether Aline is at a healthy weight for her height.

The nurse will measure Aline's height and weight, and use these numbers to calculate her BMI. This is done by dividing Aline's weight in kilograms by the square of her height in meters:

 [tex]BMI = \frac{\text{weight} (kg)}{\text{height}^2 (m^2)}[/tex].

The BMI helps to quickly and inexpensively screen if someone might be underweight, at a healthy weight, or overweight, but it doesn't measure body fat directly.

Aline's mom can also explain that the BMI test is very common and there is nothing to worry about. It's simply a tool that helps doctors and nurses make sure Aline is healthy.

The physical property which makes wax good for making molds for making sculptures is the "malleability".
This is the physical property of wax which allows it to deform under pressure and lets it take various shapes without cracking. That is why wax models are seen mostly flawless and complete looking models.

Answer:

False

Explanation:

Urban sprawl in general terms refers to the movement of people from densely populated city cores to its peripheral areas. These peripheral residential areas having low density and more living space per person is termed as Urban sprawl.  

Basically the urban sprawl can be understood as city expansion towards its fringes in order to provide cheap and larger accommodation space as compared to accommodation space with in the city.  

Thus , increase in the population of people living in urban areas will cause a increase in urban sprawl

Answer:

"The streak is the colour presented by a mineral when put into powder, in other words, in its most isolated way. The colour of a mineral, when in a rock, may be influenced by its crystal conformation, other minerals in it, or even the cut. That's why, the streak is considered the "true colour" of a mineral."

Explanation:

The person above meis correct.

LCIA can assess environmental impact and help chemists develop green chemistry solutions by evaluating sustainability and environmental performance.

LCIA (Life Cycle Impact Assessment) can help with the development of green chemistry solutions by assessing the environmental impact of different chemical processes throughout their life cycle. LCIA is a tool used to quantify and compare the potential environmental impacts of chemical processes, considering factors such as energy consumption, greenhouse gas emissions, waste generation, and use of hazardous substances. By using LCIA, chemists can evaluate the sustainability and environmental performance of different chemistry solutions, and make informed decisions to develop greener and more efficient processes.

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Answer:

A.

anaerobic respiration

Explanation:

Glucose consumption must increase in hypoxic tissues to provide the same amount of ATP that could be produced from glucose in normoxic (normal O2 levels) tissues. This is because the net yield of ATP in anaerobic condition is less as compared to aerobic condition.

Further Explanation:

The lactose and glucose are the energy source. The breakdown of glucose involves fewer steps and comparatively less energy, therefore glucose is the prime source of energy. In glucose absence, the bacteria use lactose for energy.

When the tissue is hypoxic, it means that it has a low level of oxygen and could not precede the aerobic respiration and chemical reaction. To produce energy the body will do the anaerobic reaction instead. The anaerobic reaction allows the breaks down of glucose and provides energy without consuming oxygen.

When doing aerobic respiration, the body can get up to thirty-eight ATP per molecule of glucose but it only gets two ATP for anaerobic respiration. Since, the net yield of ATP is lower in hypoxic or anaerobic condition. The aerobic condition means breakdown of glucose in the presence oxygen and it yield high amount of ATP. In anaerobic conditions, to get equal amount of energy as an aerobic reaction, then require large amount of glucose in comparison to aerobic reaction.

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Answer Details:

Grade: High School

Subject: Biology

Topic: Hypoxia

Keywords:

Cardiorespiratory exercise, oxygen, intensity, aerobic reaction, ATP, anaerobic condition, hypoxic, chemical reaction, breakdown, glucose, lactose,  energy, respiration.

Leaves are green because they contain a green pigment.

In the parlance of science, a hypothesis is a tentative explanation which must be testable.

In this case, i have hypothesized that the reason for the green color of leaves is the presence of a green pigment.

I must now subject the leaves, root and back of the tree to laboratory experiments to see if this pigment can only be extracted from the leaves.

If indeed, this pigment can only be extracted from plant leaves then the hypothesis is found to be true.

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