Just as is the case of the isotopes of an element, the individual masses of beans of the same type are very similar but not identical. Also, similar to atoms of different elements, the average masses of different types of beans are different. These characteristics enable us to use them as models for atoms.
According to the author of passage 1, one of the reasons why dodo birds were so large is that they choose 1 answer: (choice
a.a competed with larger birds, such as the haastâs eagle. (choice
b.b had food sources that included large, terrestrial animals. (choice
c.c interbred with the larger, flightless moa. (choice
d.d had no natural predators on the island of mauritius.
The dodo birds became large allegedly due to the lack of natural predators on the island they inhabited, Mauritius. Without the need to compete for survival, these birds, like the Moa and the Galápagos tortoises, grew large in their respective favorable environments.
Explanation:
According to the context provided in the passage, the dodo bird, which inhabited the island of Mauritius in the Indian Ocean, became large likely due to the lack of natural predators. The mention of the bird being easy prey because it approached people without fear suggests that it evolved in an environment where it didn't have to avoid predators. Hence, the answer to your question is (choice d): dodo birds were so large because they had no natural predators on the island of Mauritius.
Just as the example of Darwin's observation on the population of giant tortoises in the Galápagos Archipelago, the dodo bird didn't need to compete for survival, allowing them to grow large. Similarly, other birds that evolved in a favorable environment with abundant food and less competition, such as Moa, also grew large showing that species size can be largely influenced by the absence of predators and the availability of ample resources.
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Which of the following is a conceptual model that represents the flow of energy through an ecosystem? A. inheritance B. food web C. infiltration D. circulatory system
Answer: Option B food web
Explanation:
A conceptual model is the one which shows the interaction between the living and non living components of the ecosystem with the help of a flow chart.The conceptual models are also called as compartmental models.An example of the conceptual model present in the ecosystem is the food web.A food web is a system of interlocking food chains which shows the feeding relationship between various organisms.A food chain is simply a linear flow chart which shows who eats who in an ecosystem. e.g grass-----> insect----->vole---->hawkWhen several food chains are linked together we get a food web.The organisms in the food web are shown connected to each other with the help of arrows. These arrows are used to describe the feeding relation between the various organism and thus, the flow of energy.An example of a food web is attached along with the answer.All the other options that are given such as inheritance, infiltration and circulatory system do not show a conceptual model as they do not show a relationship between organisms in the ecosystem.So, the food web is the conceptual model that represents flow of energy in an ecosystem.
Which part of the cell surrounds the cell and allows molecules in and out this cell part also has holes in it and is said to be semi permeable?
Think about how diet and weight-loss companies advertise. How do they use bias to sell their products? How would you use skepticism to evaluate the data that these companies use in their advertisements?
Diet and weight-loss products use heavy bias in their advertisements. They generally claim that they are the fastest or the only way for effective weight loss. They also often use before-and-after photos as evidence to show how people change by using their products. Most of the time, they show only the body of the person, so it’s questionable whether the before-and-after photos are even of the same person. If they show the results of a research study, we can check who funded the study. If the diet or weight-loss company founded the study, then we can check whether an unbiased group replicated the study before accepting it as a fact. If not, we can see how well the study was designed and whether the company controlled other factors such as the diet or exercise of the participants.
The population of the earth is roughly six billion people. if all free electrons contained in this extension cord are evenly split among the humans, how many free electrons ( ne) would each person
Each person would receive [tex]\(4.17 \times 10^{12}\)[/tex] free electrons.
To solve this problem, we need to know the number of free electrons in the extension cord.
Let's assume that the extension cord contains [tex]\(2.5 \times 10^{22}\)[/tex] free electrons.
Now, we'll divide the total number of free electrons in the extension cord by the population of the Earth:
[tex]\[\frac{2.5 \times 10^{22}}{6 \times 10^9} = \frac{2.5 \times 10^{22}}{6,000,000,000} \approx 4.17 \times 10^{12}\][/tex]
Each person would receive approximately [tex]\(4.17 \times 10^{12}\)[/tex] free electrons.
Magine you performed a metagenomic study in which you obtained a sample of water from the huron river, isolated dna from the water sample and sequenced it using next generation sequencing on a new pacbio system, which allows to sequence fragments up to 5 kb
In anova analyses, when the null hypothesis is rejected, we can test for differences between treatment means by _____________.doing a t testdoing an additional anovaconstructing confidence intervalsadding another treatment
The correlation between a cereal's fiber and potassium contents is requals= what fraction of the variability in potassium is accounted for by the amount of fiber that servings contain?
Are polar bodies visible in your prepared slide of a cat ovary?
What is the sequence of the mrna made from the gene aaacaggtccca?
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A plant that stores water in its tissues is called a _____.
succulent
shrub
grass
weed
Which term names a change in the environment that causes an organism to take action? A. growth B. Response C. Genetics D. Stimulus
Aggressive forms of breast cancer are resistant to taxol chemotherapy. in these cancers, the gene encoding a protein called stathmin is overexpressed. to investigate the mechanism of action of stathmin, investigators measured tumor volume over time in mice with aggressive cancers under three conditions: no treatment (control), taxol treatment, and taxol treatment with stathmin gene expression turned off (taxol + δstathmin). their results are shown below. use these results to hypothesize how the stathmin protein affects microtubule stability.
Further explanation
Microtubules or microtubules are tubes composed of microtubulins which are about 37 nm in diameter and have a length. more robust than actin, microtubules regulate the position of organelles in cells. Microtubules are divided into two, namely singlet microtubules and doublet microtubules. Microtubules have two ends, the negative end connected to the microtubule regulating center, and the positive end near the plasma membrane. Organelles can glide along microtubules to reach different positions in the cell, especially during cell division.
Microtubules are formed from globular proteins called tubulin, each tubulin molecule is a heterodimer consisting of two globular subunits that are tightly bound. Both have nearly the same size, one of each type joining non-covalently
to form a dimer. Dimers are the building blocks for erecting microtubules. One by one the dimers form a cylindrical wall in the shape of a helix. The microtubules lengthen by adding molecular ulcules at the edges.
In addition to being a tubulin homodimer association, microtubules also associate with other proteins, namely MAP protein (microtubule associated protein or protein associated with microtubules! during cell division (microtubular interphase).
MAP (a group of proteins that bind and stabilize microtubules). Similar to two classes of chemicals that change microtubules, MAPS can stabilize microtubules. Therefore, the expression of this variable protein among various types of dangerous human diseases and between individual patients with the same type of cancer has implications for results in chemotherapy using targeting microtubule agents.
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Class: College
Subject: Biology
Keywords : Microtubules,Dimer, Tubulin, Protein
The porphyrin ring of chlorophyll contains the element ___ and the role of the ring is to
The porphyrin ring of chlorophyll contains magnesium and is essential for absorbing light and facilitating electron transfer in the process of photosynthesis.
The porphyrin ring of chlorophyll contains the element magnesium and the role of the ring is to absorb visible light and facilitate electron transfer during photosynthesis. Porphyrins are a group of organic compounds that are crucial to aerobic life, with a structure that supports a highly conjugated system allowing for light absorption.
In particular, the chlorophyll molecule, which gives plants their green color, is composed of a porphyrin ring and a long phytol tail. This molecule is at the heart of the photosynthetic process, capturing light energy and transferring it through a series of redox reactions to ultimately drive the synthesis of carbohydrates from carbon dioxide and water.
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Triangle CDE is translated down and to the right, forming triangle C'D'
e. Which congruency statement is correct?
a. ΔDCE ≅ ΔD'E'C'
b. ΔDCE ≅ ΔD'C'E'
c. ΔEDC ≅ ΔC'D'E'
d. ΔEDC ≅ ΔC'E'D'
Option B is correct.
b. ΔDCE ≅ ΔD'C'E'
Explanation:Triangle is a shape has three angles so when we translated it down It will become as,
CD ≅ C'D'CE ≅ C'E'DE ≅ D'E'SO, It will make three different kinds of triangles, That is why It is named as triangle and Option B is correct.
By the mid-miocene, monkeys became more common than apes because __________.
Monkeys became more common than apes in the mid-Miocene as a result of environmental changes such as forest reduction and climate cooling and drying, which favored their adaptability, diverse foraging behaviors, and faster reproduction rates.
By the mid-Miocene, monkeys became more common than apes due to a variety of environmental and evolutionary factors. The Miocene Epoch experienced significant climatic change that led to the reduction and fragmentation of forests in Africa. These changes created more open and diverse habitats which favored the generalist foraging behaviors and environmental adaptability of monkeys. As conditions became drier and cooler due to factors like the uplift of the Himalayan mountain chain, the previously extensive forests diminished and grasslands expanded, limiting the habitat suitable for apes. Monkeys thrived due to their greater adaptability and diversity in exploiting both arboreal and terrestrial niches.
Monkeys, especially the cercopithecine or cheek pouch monkeys such as macaques and baboons, could also reproduce faster than apes, giving birth every two years compared to the four or five years for gorillas and chimps, respectively. Their ability to exploit varied resources and survive in these changing conditions allowed monkeys to survive and thrive in Africa and Asia despite environmental changes that drove many ape species to extinction.
What is the name for networks of health care providers that directly provide all or most of a person's health care for a yearly fee?
1. If you approach a railroad track where the gate has come down or lights are flashing, you should stop __________
A scientist is trying to determine the relationship between clams , snails , and squids. When she generated a molecular clock he is suprised to see that clams and squid are more closely related than clams and snails which did the molecular clock data show
According to chargaff's rule, if the dna of a species contains 20% adenine, what percent of guanine will it
In an ecosystem, a deer consumes grass. What percentage of energy will the deer acquire from the grass?
Answer:
10% of total energy available in grass.
Explanation:
The energy transfer in an ecosystem occurs through the food chain and follows the 10% law and the second law of thermodynamics. Accordingly, during the transfer of energy from one trophic level to other, only 10% of energy is transferred and the rest 90% is lost as metabolic heat.
Hence, the grass will use 90% of its total energy content in respiration and this energy will be lost as heat to the surroundings. Only 10% of the energy of grass will be available for deer.
An organism's _______is the way its phenotype is expressed
What other type of cell has a cell wall?
What does exercise create in muscle fibers.... hormones, lactic acid, enzymes, red blood cells, tears?
Exercise creates muscle fibers and lactic acid, if the workout is done vigorously, that is the second option, as normal exercise can improve the enzyme activity of the muscles and improve their health.
What is exercise ?Lactic acid is produced in the muscles during intense exercise when the body's demand for energy exceeds its oxygen supply, so lactic acid can build up in the muscles and cause fatigue and discomfort, and it improves enzyme function and plays an important role in breaking down carbohydrates and fats to produce energy for the muscles, but it can cause microscopic damage to muscle fibers, resulting in muscle soreness and tears, which are usually the result of traumatic injury or overuse.
Hence, exercise creates muscle fibers and lactic acid, if the workout is done vigorously, that is the second option.
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Osteons are the basic organizational units of
Besides cardiac muscle, what other tissue type possesses pacemaker cells?
Smooth muscle is another type of tissue that possesses pacemaker cells beside the cardiac mucle. It has a pacemaker activity that can remove the vibration of waves without the present of some external stimuli. In addition, smooth muscle can also start a spontaneous contraction.
which characteristic could be observed in an organism classified in kingdom protista
A 73-year-old client has been brought to the emergency department by the client's adult children due to abrupt and uncharacteristic changes in behavior, including impairments of memory and judgment. the subsequent history and diagnostic testing have resulted in a diagnosis of delirium. which teaching point about the client's diagnosis should the nurse provide to the family?
What can you conclude about the relationship between toxin secretion and culture density in s. aureus? select the three statements that are true. what can you conclude about the relationship between toxin secretion and culture density in s. aureus? select the three statements that are true. cultures grown at high density secrete significant amounts of toxin. the transition from culture densities that do not secrete toxin to those that do secrete toxin occurs quickly after a threshold is reached. cultures grown at low density do not secrete significant amounts of toxin. there is no relationship between culture density and the amount of secreted toxin for s. aureus. the relationship between culture density and toxin secretion is linear over the range of culture densities sampled?
In S. aureus, cultures grown at high density secrete significant amounts of toxin, the transition to toxin secretion occurs quickly after reaching a threshold, and cultures grown at low density do not secrete significant amounts of toxin.
Explanation:Based on the information provided, we can conclude the following about the relationship between toxin secretion and culture density in S. aureus:
Cultures grown at high density secrete significant amounts of toxin: This statement is true, as mentioned in the information provided.The transition from culture densities that do not secrete toxin to those that do secrete toxin occurs quickly after a threshold is reached: This statement is true, indicating that there is a distinct threshold for toxin secretion.Cultures grown at low density do not secrete significant amounts of toxin: This statement is also true, indicating that toxin secretion is dependent on culture density.Explain why your results of the optimal ph of the lactase enzyme make sense for the human enzyme? explain the results in terms of the structure and function of proteins.
Final answer:
The optimal pH of the lactase enzyme is 6.5, which reflects its evolved functionality in the human small intestine. Protein structure is affected by pH, with ionic bonds forming optimally at this pH, allowing the enzyme to effectively hydrolyze lactose. Lactase persistence in some human populations is an evolutionary adaptation, enabling continued lactose digestion past weaning.
Explanation:
Optimal pH of Lactase and Protein Structure
The optimal pH for the human lactase enzyme is around 6.5. This pH level makes sense for the human enzyme because it has evolved to operate efficiently under the conditions found in the human small intestine, where lactase typically functions. The structure of proteins, including enzymes, is highly sensitive to changes in pH. At extremes of pH, the ionic bonds that maintain the protein's structure can be disrupted, leading to a change in the shape of the enzyme, also known as denaturation, and a loss of function.
The side chains of amino acids in the protein can gain or lose protons depending on the pH level, altering their charge. Ionic bonds between charged side chains can form or be disrupted by changes in pH. When the pH is optimal, these ionic bonds contribute to the stability of the enzyme's structure and enable it to bind to lactose efficiently, facilitating its proper function of hydrolyzing lactose into glucose and galactose.
Lactose intolerance occurs when an individual can no longer effectively produce lactase after weaning, leading to an inability to digest lactose and resulting in gastrointestinal discomfort when lactose-containing products are consumed. Interestingly, some populations have developed lactase persistence, likely as an adaptation to dairy farming, allowing them to continue digesting lactose into adulthood.