Each myofibril is attached at either end of the muscle fiber, when sarcomeres shorten, the muscle fiber Shortens
Mechanism :
Myofibrils are components of the animal skeletal muscles that are made up of sacromeres. They perform the muscular contraction and relaxation via the sliding filament model.
To produce motion, A cross-bridge forms between actin and the myosin heads triggering shortening of the sacromere. This shortening of the sacromere results in the contraction of the muscle fibers, which the net effect can be seen to be a shortening of the fibers.
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The same DNA strand is analyzed in four species of fish. Two species have more identical nucleotides than the others.
What does this mean?
A.They look more similar in appearance.
B.They are more closely related.
C. They do not share a common ancestor.
D. They are less closely related.
Answer:
It means that they are closely related.
Explanation:
which organism causes gastroenteritis and is possibly transmitted through the respiratory route in addition to the fecal-oral route
An organism causes gastroenteritis and is possibly transmitted through the respiratory route in addition to the fecal-oral route Noroviruses.
What is gastroenteritis?The term "gastroenteritis" refers to irritation and inflammation of the digestive tract, including the stomach and intestines.
The most common causes are viral agents, bacteria, parasites and food poisoning, and the most common complaints are diarrhoea, abdominal pain, cramps, nausea and vomiting.
Noroviruses are the leading cause of adult gastroenteritis in North America and are responsible for projectile vomiting in infected individuals.
Thus, Noroviruses is the answer.
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Where is the nucleus located in a neuron ?
The nucleus located in a neuron It is located in the cell body.
Which part of the neuron is its nucleus located?Neurons have as basic parts the cell body, dendrites and axon. Cell body: The cell body is the region where the nucleus of the neuron is located, as well as most of its organelles.
in this case, the cell body, or perikaryon, is the portion of the neuron that contains the nucleus and the cytoplasm that surrounds the nucleus.
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Why was natural selection an important contribution to the theory of evolution?
OIt proved that evolution is true.
OIt explained how evolution works.
OIt summarized the process of evolution.
It highlighted the main points of evolution.
OIt summarized the process of evolution.
Which item is a carbon source?
OA. Burning of fossil fuels
OB. Fossil-fuel deposits
O C. Limestone rock formations
OD. Replanting of rain forests
Answer:
A
Explanation:
Burning of fossil fuels
In the Exploration, the color of the bugs evolves over the course of a few generations. Give another real world example which can support Darwin’s theory.
Dog with the good smell survive in the environment as compared to bad smell.
What is another example that supports Darwin's theory?Another example of Darwinian theory is that if dogs that have a good sense of smell are better able to survive as compared to dogs without a good sense of smell. So those dogs that have this ability increase in number because those with a bad sense of smell die out.
So we can conclude that dog with the good smell survive in the environment as compared to bad smell.
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When do we use a fluorescence microscope?
A fluorescence microscope is used when one wants to image specific features of small specimens such as microbes.
What is a fluorescence microscope?A microscope that uses fluorescence to form an image.
Fluorescence microscopy has wide applications due to its high sensitivity, specificity and simplicity. It can be applied to living cells and organisms.
Fluorescence microscopy is used to view the features of small specimens such as microorganisms.
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5 things unique to photosynthesis
5 things unique to photosynthesis are:
All living things depend on the organic molecules that are synthesized by plants as a result of photosynthesis.Photosynthesis is not unique to plants. Other organisms are also capable of photosynthesis.Photosynthesis is dependent on the presence of the pigment chlorophyll.In photosynthesis, light energy is converted into chemical bond energy.Photosynthesis occurs in the daytime.What is the co-factor during photosynthesis?The co-factor during photosynthesis is Nicotinamide Adenine Dinucleotide Phosphate.(NADP), and not NAD. The latter is a coenzyme in respiration for ferrying H+(as NADH+) together with FADH+ from Kreb's Cycle into the matrix of mitochondria for oxidative phosphorylation, needed for ATPs synthesis,
Thus, this could be the answer.
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17. When transcription occurs in eukaryotic cells, a DNA strand is copied to an mRNA strand that contains introns and exons. Which of the two is needed for the
production of proteins, and why?
Exons because they are coding sequences.
Introns because they are non-coding sequences.
Introns because they are coding sequences.
Exons because they are non-coding sequences
Answer:
Exons because they are coding sequences
Explanation:
The sections of DNA (or RNA) that code for proteins are called exons.
How does water move from the biosphere to the atmosphere in the water cycle
Answer:
The water cycle depicts the ongoing circulation of water inside the Earth and atmosphere. It is a complicated structure with several functions. Water vapor evaporates from liquid water, compresses to create clouds, and falls back to earth as rain and snow.
Explanation:
The water cycle is a cyclical process in which water circulates between the earth's atmosphere, seas, and surface via precipitation, drainage in lakes and rivers, and return to the earth's atmosphere by absorption and evaporation. Throughout respiration, organisms exhale carbon dioxide and water vapor, which evaporates back into the atmosphere.
What is cladistics?
OA. The comparison of species based on common behavioral
characteristics
B. The comparison of species based on their geographic range
C. The comparison of species based on the presence or absence of
ancestral traits
D. The comparison of species based on common physical
characteristics
The comparison of species based on common physical characteristics Thus, the correct option is D.
What is cladistics?Cladistics is a method of biological taxonomy that organizes taxa in a branching hierarchy so that all members of a given taxon share the same ancestors and defines taxa uniquely by shared traits not present in ancestral groupings.
Clades, which are collections of organisms made up of an ancestor species and its offspring, are also identified through cladistics.
A cladogram only displays one probable phylogeny for a collection of organisms. It can shed light on the process of evolution. A cladogram should not be viewed as a representation of genuine evolutionary processes, though. It may or may not depict what actually occurred. It merely illustrates what might have occurred.
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PLEASE HELP MEEE WITH THIS QUESTION
Answer:
2) 6) 3) 4)
Explanation:
The following factors will affect the current oxygen and carbon dioxide levels.
Burning fossil fuels increases the output of CO2 outside of organisms that perform cellular respiration-CO2 is a green house gas and is a cause of global warming. burning fossil fuels will increase CO2 in the atmosphere which cannot be balanced by the natural sinks like forests and oceans.Deforestation reduces the number of photosynthetic organisms able to produce oxygen and consume carbon dioxide. Deforestation causes habitat loss and hence a large amount of tree cover is lost which will reduce the amount of oxygen generated and CO2 absorbed.When land is deforested for agriculture, the photosynthetic productivity of crops is not equivalent to the forests being replaced. This is so because forests have large trees and plants which have a greater photosynthesis capacity however new crops which are small and are removed annually are not able to compensate for the loss of large forest trees.learn more about oxygen and carbon dioxide levels here:
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Which of the following phrases can be used to describe the genotype Ee?
A. Homozygous dominant
B. Heterozygous recessive
C. Heterozygous dominant
D. Homozygous recessive
Answer:
C
Explanation:
one letter big and one small
the first letter is capital
The scientific evidence that scientists use in supporting or critiquing the conclusions of experiments usually consists of
A) raw data
B) outlier data
C) precise data
D) summarized data
Answer:
The answer is A raw data i think I'm not sure
Which are the only two photic zones in the ocean?
a. Epipelagic and Abyssopelagic
b. Mesopelagic and Epipelagic
c. Epipelagic and Bathypelagic
d. Abyssopelagic and Bathypelagic
Part b is the answer- Mesopelagic and Epipelagic
Answer: d. Abyssopelagic and Bathypelagic
A student drew this model to show the gas exchange in the human body.
a diagram of the transport of oxygen and carbon dioxide around the body in the blood, from the lungs to the organs and again to the lungs
What are the strengths of the model the student created?
Answer:
gases
Explanation:
one strength would be that the graph clearly shows the gases and pathway of the gases which are taken in and used in exhalation.
Susan makes a claim that humans do not evolve because we adapt to situations by changing our technology, not ourselves. which piece of evidence contradicts this idea? humans have been using tools for a long time. other primates also use tools. the size of our brains has increased since humans started using tools. our technology is always increasing.
The correct answer is option C.
The size of our brains has increased since we became tools users.
Researchers have proved that using modern technology gadgets not only modifies our brain functioning, but also stimulates our brain to make it more active.
Humans do not evolve because we adapt to situations by changing our technology, not ourselves.
EASYYY IM TIRED, IVE BEEN ON 2 REDBULLS TRNA STAY AWAKE DOING HW. I NEED HELP WITH THIS ONE QUESTION SO I CAN GTS!!!!
What would happen if you decreased the amount of light available to the model biosphere?
Answer:
the Vajpayee is a term that ecompasses all the ecosystem from the Earth it there for increase both non living elements like sunlight and water and leaving organisms
Explanation:
hope it is helpful
Answer:
Explanation:
: There's only one stable, long-lasting biosphere that we know of. It's the Earth. It shouldn't surprise you that human attempts to create sealed systems don't generally fare very well. The International Space Station, despite efforts to recycle everything possible (including converting urine to drinkable water--do you still want to be an astronaut?) to reduce costs, couldn't sustain life for long without a steady supply of provisions from, and garbage hauling back to, Earth. You know they try hard because, if all goes as planned, it costs about $10,000 to put a pound of payload (supplies) into Earth orbit. The BioSphere 2 project in Southern Arizona was an interesting and costly effort, but the original studies weren't very scientific and it proved quite difficult to keep just a handful of humans alive for a relatively short period of time. You can buy tiny sealed marine ecosystems enclosed in glass. They are beautiful curiosities, but the one I bought for my wife lasted less than a year before crashing. Among the crazier justifications for space exploration is that when (note the assumption of inevitability) we ruin the Earth, we will need new places to live (and, presumably, ruin). Unless or until we can do a lot better at building self-contained ecosystems, it would be a far better use of human effort to focus on preserving the only one we've got. Not only that but, if we make the Earth uninhabitable, I'm not sure we deserve to live somewhere else. But the challenge itself is interesting, and the scientific questions you can ask in the process of understanding, building, and trying to maintain such a system are valid. We're going to give it a try. Good luck! There's a Nobel Prize in it.
Summation that results from the cumulative effect of multiple synapses at multiple places on the neuron is designated.
Summation that results from the cumulative effect of multiple synapses at multiple places on the neuron is designated spatial summation.
A strategy for generating an action potential in a neuron using input from several presynaptic cells is called spatial summation. It is the algebraic addition of potentials from various input regions, typically dendrites.This process, known as spatial summation, occurs when inputs from several neurons combine to cause an action potential. These potentials, which are often from dendrites, are combined to produce the spatial summation.The likelihood that a potential will reach the threshold level required to trigger an action potential increases with the amount of excitatory postsynaptic potentials. Similar to this, the likelihood of attaining the threshold potential to trigger an action potential decreases as the number of inhibitory postsynaptic potentials increases.
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What must occur for protein translation to begin?
O Awater molecule must be added to the
protein chain.
A peptide bond must form between subunits of mRNA
The amino acid Cys must be picked up by tRNA.
The codon AUG must be identified.
Answer:
D.
Explanation:
AUG is the start codon
Comparable segments of the mitochondrial DNA sequences of two similar species are shown below. This segment of DNA mutates at a rate of two base pair per 330,000. years. The DNA sequences for Species A is CTGTCCGAAG and Species B is CTGTCCGTCG. How many years ago did these species diverge from a common ancestor? 660,000 years ago
33 years ago
330,000 years ago
6,000 years ago
The homo-logous mitochondrial sequences CTGTCCGAAG and CTGTCCGTCG suggest that species diverge from a common ancestor 660,000 years ago.
What is the mutation rate?The mutation rate indicates the number of nucleotide differences between two homo-logous sequences that emerged in evolution in a given period of time.
In this case, the mutation rate is one nucleotide per 330,000 years and here we have two mutations (CTGTCCGAAG and CTGTCCGTCG), thereby it is expected that the sequences diverged 660,000 years ago.
In conclusion, the homo-logous mitochondrial sequences CTGTCCGAAG and CTGTCCGTCG suggest that species diverge from a common ancestor 660,000 years ago.
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What does it mean to describe a scientist as skeptical.
Answer:
To describe a scientist as skeptical means that they question both existing ideas and new hypotheses.
Explanation:
Skepticism is the act of suspending judgment (the opposite of jumping to conclusions) when evaluating an explanation or claims. It allows scientists to consider all possibilities and systematically question all information in the course of an investigation
Why is acetylcholine broken down?
Acetylcholine broken down is the process by which this neurotransmitter activates a suitable ligand-receptor to trigger a cell signaling pathway.
What is Acetylcholine?Acetylcholine is a chemical messenger (i.e., a neurotransmitter) that is used to transmit signals inside the body.
Acetylcholine broken down is due to its hydrolysis, which ends cell signaling between brain synapses.
In conclusion, Acetylcholine broken down is the process by which this neurotransmitter activates a suitable ligand-receptor to trigger a cell signaling pathway.
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If a wire carrying an electric current is placed in a magnetic field, a force is produced. What name is given to this effect?
Answer:
The Motor Effect
Explanation:
:)
Answer:
The Motor Effect
What term describes a plant's response to external stimuli like light, gravity, and touch?
According to the research, a tropism is a plant's response to external stimuli like light, gravity, and touch.
What is a tropism?It is the response that plants or certain organs of them make to a stimulus that comes from the outside.
There are different classes of tropisms according to the nature of the stimulus, gravitropism, phototropism, heliotropism among others.
Therefore, we can conclude that according to the research, a tropism is a plant's response to external stimuli like light, gravity, and touch.
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which of the following is not an important er-resident enzyme that modifies proteins in the secretory pathway?
The option that is not an important er-resident enzyme that modifies proteins in the secretory pathway is D) Sec61.
What are the ER enzymes?The smooth ERare those enzymes that take part in the synthesis of lipids as well as the phospholipids, and they carry out important role in the formation of new cellular membrane.
Some important er-resident enzyme are:
oligosaccharyl transferase BiPprotein disulfide isomeraseTherefore , option D is correct.
The options for the question are:
A) oligosaccharyl transferase
B) BiP
C) protein disulfide isomerase
D) Sec61
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cells that are thick in the middle and tapered towards the end are called _________ cells
Cells that are thick in the middle and tapered towards the end are called fusiform cells
What are fusiform cells?Fusiform cells are those cells that has a spindle-like structure which means that it is thinner at the extremes and larger at the center.
A typical example of fusiform cell are the cells of the dorsal cochlear nucleus (DCN).
Therefore, cells that are thick in the middle and tapered towards the end are called fusiform cells
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a nucleus can be found in which type of cell?
a. prokaryotic cells
b. eukaryotic cells
c. all cells.
[tex]\quad \huge \quad \quad \boxed{ \tt \:Answer }[/tex]
[tex]\qquad \tt \rightarrow \: b. Eukaryotic \:\: cells[/tex]
____________________________________
[tex] \large \tt Solution \: : [/tex]
Nucleus is only found in developed cells (eukaryotic cells), because they have well differentiated cell organelles and are mich developed.
where as, prokaryotic cells are primitive cells that have no distinguished organelles and many organelles aren't even present. they have genetic materials spread over in cytoplasm.
Hence, we can conclude that Nucleus can only be found in eukaryotic cells.
Answered by : ❝ AǫᴜᴀWɪᴢ ❞
Answer:
b. eukaryotic cells
All cells have ribosomes.
However, some cells have more
ribosomes than others.
the
Which cells have the MOST
ribosomes?
A. Cells that produce proteins.
B. Cells that produce energy.
C. Cells that are involved in reproduction.
Answer:
B
Explanation:
Ribosomes main purpose is to make proteins from the process called translation. This is the second step in the process.
Select the correct text in the passage.
Which phrase indicates a limit to the scientific accuracy of the experiment?
For the study of a particular drug, Marcus proposes an experiment with a particular population. Approximately 200,000 people in the United States take this drug. He started out with a sample size of 300 people. First, he conducts research on the medical history of the people in his study. He collects the information using reliable sources. He decides to repeat the experiment using a larger sample size.
The phrase that indicates a limit to the scientific accuracy of the experiment is to repeat the experiment using a larger sample size.
What is Scientific accuracy?Scientific accuracy may be defined as the correctness of a single measurement that should be accomplished by scientists during their practical experiments.
The complete question is as follows:
the sample size of 300 people.research on the medical historycollects the information using reliable sourcesrepeat the experiment using a larger sample size.The sample size will always play an active role in research. It also has a big impact on the accuracy of a scientific study. A larger sample size gives the most accurate results as compared to small sample size.
Therefore, the correct option is D.
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Answer:
" a sample size of 300 people "
Hope this helps!
Explanation: