Review the chart, which shows the population sizes of three African animals in 1990 and in 2000.
1990 → 2000
Lions . 100,000 .→ 47,000
Cheetahs 50,000 → 7,500
Zebras 15,000 → 2,500
Which explanation is best supported by the numbers in the chart?
A)Lion and cheetah populations compete for the food source of zebras, and lions outcompete cheetahs.
B)The dwindling zebra population has led to the decline of the predator lion and cheetah populations.
C)Overhunting of lion and cheetah populations has led to a decline in the food source population.
D)Lion and cheetah populations compete for the food source of zebras, and cheetahs outcompete lions.
When your body sweats, which process is at work to cool your body off?
Answer:
evaporation
Explanation:
it was right on my quiz
Which of the four types of organic compounds serve as an energy source for cells?
With an overabundance of elk, the next population in the yellowstone ecosystem to be directly affected was/were ________.
Mound-shaped structures composed of alternating layers of bacteria and sediment are called
Why did la follette think that an elected official selected by convention will be more loyal to party bosses than to voters?
Robert 'Fighting Bob' La Follette believed that officials elected via the party convention process were likely to be more loyal to party bosses who facilitated their selection rather than to the voters. He witnessed this in the period between 1872 and 1896 when presidents were more swayed by the interests of their party and key contributors than those of the public. Hence, La Follette advocated for reforms like the direct election of senators to ensure the accountability of elected officials to voters.
Explanation:Robert La Follette, or 'Fighting Bob', was a leading figure in the Progressive era of U.S. politics, introducing numerous progressive reforms during his tenure as governor of Wisconsin, such as the Wisconsin Idea, and subsequently arising as a prominent U.S. senator. His belief that an elected official selected by convention would be more loyal to party bosses than to voters was rooted in his understanding of the political landscape of the time. During this period, strong political parties had overtaken the nominating power of state legislatures and controlled the selection of candidates via the convention process. This granted them significant influence over the elected officials.
La Follette believed that if an official was elected through a party-convention process, there was a greater likelihood that their loyalty would lie more with party bosses who influenced or facilitated their selection rather than with the voters. Elected officials could owe favors to party bosses and key financial contributors, which might sway their loyalties. This was exemplified in the period between 1872 and 1896, where presidents, lacking clear popular mandates, were often more susceptible to the interests of their party and key financial contributors rather than those of the people they served.
La Folllete’s concern also pursued from the view that, historically, conventions controlled the selection process tightly, which gradually changed as primaries took on more significance in the early twentieth century. Yet, the party leadership still exercised considerable control over the nomination process. This is why La Follette advocated for Progressive ideas such as the direct election of senators, to make elected officials more accountable to voters rather than party bigwigs.
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La Follette believed that officials selected by convention would be more loyal to party bosses because those conventions were dominated by party elites, limited voter influence, and promoted political patronage, which fostered loyalty to the party rather than to the electorate.
Robert La Follette believed that elected officials chosen through conventions would be more loyal to party bosses than to voters for several reasons:
Control by Party Elite: Conventions were typically dominated by party bosses and elites who had more influence over selecting candidates, leading to officials being more beholden to those who secured their nominations.Lack of Direct Voter Influence: Unlike primary elections where the general electorate has a say, conventions limited voter participation, making it easier for party bosses to push their preferred candidates.Political Patronage: Party bosses often provided crucial support and resources for a candidate's election campaign, creating a sense of obligation and loyalty towards them.Agenda Setting: Party bosses had the power to advance or hinder an official's political career, thereby influencing their decisions and loyalty.La Follette’s stance was grounded in his broader Progressive effort to increase democracy and reduce corruption within the political system.
If stranded on a deserted island with no freshwater, it is not advisable to drink sea water. Why not?
A) The salty snacks cause an ionic imbalance that triggers a nervous response.
B)The salt in the body creates a hypertonic solution around cells, which causes water to diffuse out of cells and make them crenate.
C) The salt in the body creates a hypotonic solution around cells, which causes water to diffuse into cells and make them cytolyse.
D)The salt in the body creates an isotonic solution around cells, which causes water to diffuse into and out of cells which makes them unstable.
A diet high in dietary fiber can help reduce the risk of developing:
a. diverticular disease.
b. anemia.
c. type 1 diabetes.
d. lactose intolerance.
Which of these are parts of the appendicular skeleton?
a. skull and mandible
b. vertebrae and ribs
c. humerus and phalanges
d. ribs and sternum?
help!!
Electromagnetic waves that are very harmful to living things include
radio waves
light waves
infrared rays
gamma rays
Final answer:
Gamma rays are the most harmful type of electromagnetic waves to living beings, having high energy that can damage cells and DNA; while radio waves, light waves, and infrared rays are less dangerous.
Explanation:
Among the options provided, gamma rays are considered the most harmful type of electromagnetic waves to living things. They have the shortest wavelengths and the highest frequencies in the electromagnetic spectrum, allowing them to carry a significant amount of energy that can penetrate living tissues and cause serious damage at the cellular and DNA level. This is why exposure to gamma rays is strictly controlled, and they are used with extreme caution in medical treatments and industrial applications. Conversely, radio waves, light waves, and infrared rays have much longer wavelengths, lower frequencies, and therefore carry less energy, making them generally less harmful to living organisms.
Water is
crucial to all life
essential to all life
not that important
found on most planets
Answer: Crucial to all life forms
Explanation:
Water is the most important component for the life forms existing on earth. The earth is covered 70 per cent with water.
All the living components would die without water as it is unevitable part of life. It is used for drinking purpose , washing purpose, industries and factories and has many more domestic and commercial purposes.
Water is also known as universal solvent and dissolves many compounds in it.
If 23 percent of the bases in a sample of double stranded dna is adenine, what percentage of the bases are uracil? 73 27 23 50
If 23% of the bases in a sample of double-standard DNA are adenine, then 23% of uracil bases are found in mRNA. No uracil will be found in DNA.
What is DNA?DNA is deoxyribonucleic acid. The two DNA strands are connected to each other with the help of hydrogen bases. The DNA has four nitrogenous bases. Out of four, two are purines and two are pyrimidines.
Adenine (A) and guanine (G) are purines. They are double ringed structures. Cytosine (C) and thymine (T) are pyrimidines. They have single rings. Adenine is complementary to thymine and forms two hydrogen bonds. Guanine is complementary to cytosine and forms three hydrogen bonds.
In RNA, instead of the thymine base, uracil is present. Uracil makes complementary bonds with Adenine of DNA during the transcription. The amount of adenine in the DNA will be equal to the amount of uracil in the mRNA.
Hence, 23% of the adenine in the DNA will form 23% of the uracil in the mRNA. Option c is the answer.
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What do a mouse, a dandelion, and a shark all have in common?
a.they have the same environmental requirements.
b.they get their energy from other organisms.
c.they use carbon dioxide to make their food.
d.they need to take in water?
Which process can be primarily affected by gallbladder disease? carbohydrate digestion fat digestion protein digestion vitamin digestion
yoAnswer:
Explanation:
Cells produce ATP both aerobically and anaerobically. One process is an integral part of aerobic respiration that produces the majority of ATP molecules is
Answer: The correct answer is Electron transport chain.
Electron transport chain is a series of protein and organic molecules present in the inner membrane of mitochondria that help in the transfer of electrons from higher energy to lower energy state. Reduced electron carriers that is FADH₂ and NADH transfer electrons via the these organic complexes through redox reactions and finally electrons are accepted by oxygen. The redox reactions capture energy in the form of proton gradient.
The proton gradient helps in the generation of large amount of ATP molecules through chemiosmosis.
Therefore, electron transport chain is an integral part of aerobic respiration.
In 1899 orville and wilbur wright developed a bi-wing construction they called the
The minimal circumstances under which medical attention should be sought for a burn victim is when the surface area of a second degree burn is great than
Which came first, the chicken or the egg?
a.the egg, because the amniotic egg evolved well before the first bird.
b.the egg, because the chicken is not a real species.
c.the chicken, because during speciation the adult stage always precedes the juvenile stage.
d.the chicken, because the amniotic egg did not evolve until after the first chicken appeared.
e.the egg, because the chicken had to cross the road to sit on it?
Answer:
A
Explanation:
the Venn diagram compares aerobic and anaerobic respiration.
which statement could be categorized in the overlapping section of the Venn diagram?
A. uses pyruvic acid
B. has commercial uses
C. regenerates NADH
D. produces 36 ATP
The right answer is A. uses pyruvic acid
Pyruvate, the final product of glycolysis, follows different catabolic pathways according to the nature of the organism and the metabolic conditions.
- Lactic fermentation: anaerobic glycolysis in the muscle in contraction or in certain tissue types (brain, retina, erythrocytes).
- Alcoholic fermentation: anaerobic glycolysis in yeast and certain microorganisms.
- The oxidative decarboxylation followed by the Krebs cycle: oxidation of pyruvate to CO2 and H2O in animals, plants and many prokaryotic aerobic cells.
Ans.
Aerobic respiration involves complete breakdown of a glucose molecule in the presence of oxygen to generate energy, in the form of ATP molecules (36 molecules of ATP).
On the other hand, anaerobic respiration involves partial breakdown of a glucose molecule in the absence of oxygen to generate energy as ATP molecules (2 molecules of ATP).
The common feature, shared by both aerobic and anaerobic respiration is use of pyruvate (pyruvic acid). The pyruvic acid is formed by the process of glycolysis, which is common for both the processes.
In aerobic respiration, pyruvic acid is used to form acetyl coenzyme A that enters the Kreb's cycle, while during the anaerobic respiration, pyruvic acid is used to make alcohol or lactic acid to regenerate NAD+.
Thus, the correct answer is option A). 'uses pyruvic acid.'
A patient's cotranslational and post-translational processes have reversed roles. based on this knowledge, identify what type of sorting occurs with proteins destined for each organelle
Protein sorting involves the delivery of proteins to their correct cellular destinations using sorting signals. A reversal of cotranslational and post-translational processes would change how proteins are directed to organelles, potentially disrupting cellular function.
Explanation:Understanding Protein Sorting in Cells
Protein sorting is the intricate process by which proteins are correctly identified and delivered to their designated cellular destinations after being synthesized. Proteins possess sorting signals or 'address labels', guiding them to areas such as the nucleus, endoplasmic reticulum (ER), and mitochondria. During the cotranslational process, proteins are typically directed to their target sites while they are being synthesized. This includes proteins entering the ER. Conversely, post-translational sorting involves the transportation of proteins to their respective locations following their synthesis, such as in the case of mitochondrial and nuclear proteins.
Upon considering the scenario where the roles of cotranslational and post-translational processes have been reversed, proteins usually directed to the ER during synthesis would now be sorted after synthesis. Similarly, proteins that are ordinarily sorted to their destinations like the mitochondria or nucleus after synthesis would now need to have their sorting signals recognized co-translationally. This would imply a fundamental alteration in the cell's protein trafficking machinery and could potentially affect the efficiency and accuracy of protein sorting.
In photosynthesis where is the electron transport chain enzymes located
Hematopoiesis refers to the formation of blood cells within the red marrow cavities of certain bones. hematopoiesis refers to the formation of blood cells within the red marrow cavities of certain bones.
a. True
b. False
True, hematopoiesis is the process by which blood cells are formed within the red marrow cavities of certain bones, producing red and white blood cells and platelets.
True, hematopoiesis refers to the formation of blood cells within the red marrow cavities of certain bones. This vital process takes place in the red marrow found inside bones such as the pelvis, ribs, vertebrae, sternum, and the proximal ends of the femur and humerus. The red marrow is responsible for the synthesis of the three primary types of blood cells: red blood cells (erythrocytes), white blood cells (leukocytes), and platelets (thrombocytes). Billions of these blood cells are produced daily to replace the old cells that have a short lifespan. Hematopoietic stem cells, or hemocytoblasts, are the source of all formed blood elements. These stem cells proliferate and differentiate into various blood cells, ensuring a continuous replenishment of the blood supply.
A student is conducting an experiment to determine how far a ball will roll down a ramp based on the angle of incline. What are the independent and dependent variables for this experiment?
How does the integumentary system work with the nervous system?
Answer:
The integumentary reduces water loss, contains receptors that respond to touch, regulates body temperature, and protects the inside of the body from damage. Receptors in skin send sensory information to the brain. The autonomic nervous system regulates peripheral blood flow and sweat glands.Explanation:
When blood calcium levels drop, glands embedded in the posterior thyroid secrete ____________ hormone, which stimulates osteoclastic activity?
The individual whose name is associated with a natural experiment during an outbreak of cholera in london was
Lymphatic vessel ____________ cells are different from blood vessel cells.
how do phospholipid molecules lead to the compartmentalization of a cell?
Phospholipid molecules lead to the compartmentalization of a cell through the formation of cell membranes. These membranes create compartments within the cell and help control the movement of substances.
Explanation:Phospholipid molecules lead to the compartmentalization of a cell through the formation of cell membranes. Cell membranes are made up of phospholipid bilayers, with the hydrophobic tails facing inward and the hydrophilic heads facing outward. This structure forms a barrier that separates the cell from its external environment and creates different compartments within the cell.
The phospholipid molecules arrange themselves in a bilayer due to their amphipathic nature, meaning they have both hydrophilic and hydrophobic regions. This arrangement allows the cell to control the movement of substances in and out of the cell, which is crucial for maintaining cellular homeostasis.
Additionally, organelles within a cell, such as the nucleus, mitochondria, and endoplasmic reticulum, are also enclosed by phospholipid membranes. These membranes create compartments within the cell that allow for specialized functions to occur.
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Cholesterol transported from the cells to the liver by hdl can then be used to synthesize bile. cholesterol transported from the cells to the liver by hdl can then be used to synthesize bile.
a. True
b. False
Which combination of foods would provide all the essential amino acids? rice and beans, corn and lima beans, pea soup and bread?