No matter what the cell type, prokaryotic or eukaryotic, plant or animal, the ____________ forms a protective barrier between the exterior environment and the interior of the cell.
Answer: The correct answer for the fill in the blank is Cell membrane.
Cell membrane ( also called plasma membrane) is the membrane around cytoplasm of the cell. It is present in the cells of all living organisms. It forms a protective barrier of the cell as it separates interior components from the external environment of the cell.
It is a selectively permeable membrane as it controls the transport of substances in and out of the cell. By doing this, it does not allow the harmful substances to enter the cell.
what are some of the health issues that clones may experience?
Atp is required to cause the power stroke in the myosin head. atp is required to cause the power stroke in the myosin head.
a. True
b. False
The power stroke in muscle contraction occurs when ADP and phosphate dissociate from the myosin head, not when ATP is hydrolyzed. ATP provides the energy for the myosin head's cocking and release processes but not for the power stroke itself. Therefore, the statement is false.
In muscle contraction, the power stroke occurs when ADP and phosphate dissociate from the myosin head. ATP is essential for the cocking of the myosin head and the release of the myosin head from the actin filament, but the actual power stroke, which pulls the actin filament, happens due to the release of ADP and phosphate from the myosin head.
In summary, muscle contraction involves:ATP hydrolysis to ADP and phosphate, cocking the myosin head.Formation of a cross-bridge with actin.Release of ADP and phosphate from myosin, causing the power stroke.Binding of a new ATP molecule to release myosin from actin, enabling the cycle to start anew.The statement 'ATP is required to cause the power stroke in the myosin head' is False.
Alveoli are the terminal air sacs of the lungs, and are the sites of gas exchange between the lungs and blood. How does the surface area-to-volume ratio of the cells of alveolar walls relate to their function? please hurry.
. Which factor does not take a population out of Hardy-Weinberg equilibrium? allele frequency natural selection mutation rate genetic drift
Allele frequency
Explanation;According to Hardy Weinberg Principle, the gene or allele frequencies in a population will remain stable from generation to generation until acted on by an outside force.Allele frequencies in a population will not change from generation to generation, as far as factors of evolution such as natural selection, mutation, and migration are not taking place.Hardy-Weinberg equilibrium can be disturbed by the forces of evolution which includes, mutations, natural selection, gene flow, non-random mating and genetic drift.What are the ways life has improved and worsened in animal farm?
Ways Life Has Improved:
- The animals only have to produce for themselves.
- The animals can vote for change.
- The animals dfon't have to worry about being killed by the farmers.
- The aniumalse more productive and more happy.
- The animals are now hopeful for the future.
- The animal's food tastes a lot better.
- Their harvests are much more successful.
Ways Life Has Worsened
- Some animals are strict and angry.
- The animals do not keep as much of their food because the pigs eat it.
- The pigs take charge, and they are not very faithful.
- The seven commandments are disappearing.
- The life of the farm only improved for the pigs.
- The leaders on the farm are not very good.
- A lot of the animals always feel hungry and cold.
Describe the difference between exocrine glands and endocrine glands. list below an example of each and what hormone they release.
Autonomic tone, the balance between sympathetic and parasympathetic activity, is regulated by the
Jamal is asked to write a science essay about molecular forces. He first turns to his science textbook for information. Which is the BEST second source for Jamal’s research?
Answer:
a scientific journalExplanation:
Gallup reports that 30% of american adults have high blood pressure. a medical office selects at random 2 unrelated medical records from their adult patients. the probability that both patients have high blood pressure is
To find the probability that both selected patients have high blood pressure given a 30% prevalence, multiply the individual probabilities (0.30 x 0.30), resulting in a 9% probability that both have the condition.
Explanation:The question is pertaining to the calculation of the probability that both of two randomly selected patients have high blood pressure, given that 30% of American adults have this condition. This is a problem of statistics that involves the use of the multiplication rule for independent events. To find the probability that both patients have high blood pressure, you would multiply the probability of one having high blood pressure by the probability that the second one does as well, assuming the two events are independent.
Since there is a 30% chance (or 0.30 probability) that one patient has high blood pressure, the calculation would be 0.30 (the probability of the first patient having high blood pressure) times 0.30 (the probability of the second patient having high blood pressure), which results in 0.09, or 9%.
URGENT 16PTS!!!
Explain how mRNA is produced during the process of DNA transcription
just write like 2 sentences. Thanks
mRNA is synthesized from DNA during transcription, where RNA polymerase reads the DNA strand and assembles a complementary mRNA strand using Uracil in place of Thymine.
mRNA generation during DNA transcription occurs when RNA polymerase binds to the DNA strand at the transcription start site and synthesizes a strand of mRNA by reading the DNA from 3' to 5'. Uracil is used in the mRNA sequence instead of Thymine, which differs from the DNA template.
Through the base pairing rules, RNA polymerase ensures the DNA code is successfully transcribed into a complimentary mRNA sequence, which later exits the nucleus to be used in protein synthesis during the process of translation.
Bill expends 2,500 kilocalories per day. what amount of kilocalories will be from basal metabolism
Review the water cycle diagram below. What effect would removing the precipitation stage have on this environment?
A). There would be little snow and ice accumulation on the mountains.
B). There would be more evapotranspiration in the atmosphere.
C). There would be less water in the nearby oceans or bodies of water.
D). There would be increased surface runoff and groundwater discharge.
Answer:
Option C, There would be less water in the nearby oceans or bodies of water.
Explanation:
In the precipitation phase of water cycle, the water from clouds return back to earth in the form of rain, hail snow etc, so that it could reach the nearby water stream/body from where it can evaporate again and complete the water cycle. Now if the stage of precipitation is removed, the water that once evaporated from earth will never come back and hence after some time the water bodies will not enough water for evaporation, due t which the water cycle will be destroyed.
Hence, option C is correct.
Answer:
D
Explanation:
You are dispatched to an industrial plant for a burn. you arrive and find a 60-year-old male who came in contact with a broken steam line and appears to have partial thickness burns on both hands and arms. he is lying on the ground and coworkers are gently spraying him with water from a nearby hose. what should you do? a call for air transport and continue to pour water on the burns until transport arrives. b before doing treatment, call the local burn center for instruction. c care for the burn and do a complete patient assessment, including cervical spine precautions. d because of his age, immediately put him in your ambulance and transport him to a burn center.
Within a eukaryotic cell aerobic cellular respiration occurs within the
Answer:
mitochondria
Explanation:
Next-generation sequencing reveals six new mutations have occurred in the coding regions of genes in an individual diploid fly. if the coding regions of this fly comprise 100 million nucleotides per haploid genome, what is the mutation rate per nucleotide?
The mutation rate per nucleotide in the coding regions of the diploid fly's genome is 3 x 10^-8, derived by dividing the six new mutations by the total nucleotides in the diploid coding genome (200 million).
To calculate the mutation rate per nucleotide in the coding regions of the diploid fly's genome, we first consider the total number of coding bases per diploid genome, which is 2 x 100 million (as each haploid genome contains 100 million and the fly is diploid). If there are six new mutations, we divide the total number of new mutations by the total number of nucleotides in the coding regions of the diploid genome.
The calculation is as follows: 6 mutations / (2 x 100,000,000 nucleotides) = 3 x 10-8 mutations per nucleotide. This means the mutation rate is 3 x 10-8 for this individual fly.
(b) which statements below describe the changes that molecules undergo when heat is applied during a phase change?
What is found in chloroplasts of green algae
The sphere that consists of soil, sand, rocks and all structures comprising the land is the
a. Hydrosphere
b. Atmosphere
c. Lithosphere
d. Biosphere
The sphere that consists of soil, sand, rocks and all structures comprising the land is the lithosphere.
LITHOSPHERE:
Every substance on planet Earth can be categorized into four major groups known as spheres. The four spheres include; biosphere, lithosphere, atmosphere and hydrosphere. Biosphere: This refers to life i.e. every living thing that encompasses the Earth e.g. animals, plants, microbes etc.Lithosphere: This includes the solid non-living part of the Earth e.g land, soil, rocks etc. Atmosphere: This refers to the gaseous entities found on Earth e.g. gases etc. Hydrosphere: This is related to water or liquid part of the Earth. It includes oceans, seas etc. Therefore, the sphere that consists of soil, sand, rocks and all structures comprising the land is the lithosphere.Learn more: https://brainly.com/question/8988364?referrer=searchResults
The three layers of specialized membranes surrounding the brain and spinal cord are the:
What are two ways plant cells are like animal and human cells?
Answer:
Both animal and human cells include the following: reproduction, nucleus, organelles, plasma membranes.
Both plant cells and animal or human cells are multicellular and eukaryotic in nature. And due to this, the level of complexity is actually the same in both types of cells.
What is a Plant cell?A plant cell may be defined as a eukaryotic cell that is present in green plants, as well as photosynthetic eukaryotes of the kingdom Plantae.
Both plant cells and animal or human cells contain membrane-bound cell organelles with a specific nucleus, mitochondria, etc.
They produce offspring through the process of reproduction.
Therefore, it is well described above.
To learn more about Plant cells, refer to the link:
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What structures are present in both gymnosperms and angiosperms but absent in both bryophytes and ferns?
Squirrels and chipmunks compete for the same food source. What is most likely to happen to the degree of competition between these two species if their food became scarce? decrease increase stay the same disappear
help please
Explain why cells don't just continue to grow larger as organisms grow larger. why do cell divide?
how does energy travel?
In the b-galactosidase lab, why was o-nitrophenol-b-d-galactosidase (onpg) used?
ONPG is used in the b-galactosidase lab to detect the presence of active enzymes.
ONPG is used in the b-galactosidase lab to detect active enzymes by yielding a yellow color upon cleavage. It is essential for enzyme activity detection in assays monitoring the cleavage of o-nitrophenyl-b-galactoside. When cleaved by b-galactosidase, ONPG yields a yellow color, indicating enzyme activity. This chemical is utilized in assays to monitor the cleavage of o-nitrophenyl-b-galactoside.
What are three main sources of atp available for human muscle cells?
Human muscle cells generate ATP through creatine phosphate, glycogen breakdown, and cellular respiration, allowing for both short bursts and sustained muscle activity.
Explanation:The three main sources of ATP available for human muscle cells during contraction are:
Creatine phosphate: This compound serves as a temporary reserve of high-energy phosphate that can quickly generate ATP from ADP. It provides energy for approximately the first 15 seconds of muscle contraction.Glycogen: Muscle fibers degrade glycogen via glycogenolysis, which leads to the production of ATP through glycolytic pathways. While not a sustainable long-term source of ATP, it is crucial for short bursts of muscle activity.Cellular respiration: This process occurs in the mitochondria and can produce ATP aerobically (with oxygen) or anaerobically (without oxygen). Aerobic respiration yields a larger amount of ATP and is essential for prolonged muscle activity.Essentially, muscle cells first use ATP that is readily available, followed by the conversion of creatine phosphate to ATP. As muscle activity continues, ATP is generated from glycogen and then through cellular respiration, to meet the energy demands of sustained muscle contractions.
When observing a bird skin cell in g2 under a microscope, you count 160 total chromatids. how many chromosomes does a male chicken have in its sperm cells?
Final answer:
A bird skin cell in G2 with 160 chromatids leads to the conclusion that there are 80 chromosomes in diploid cells; hence, male chicken sperm cells would have 40 chromosomes, which is half the diploid number.
Explanation:
Observing a bird skin cell in G2 that has 160 total chromatids indicates that the diploid number of chromosomes in the bird species is 80, as each chromosome consists of two chromatids during the G2 phase of the cell cycle. Sperm cells are haploid, containing half the number of chromosomes found in somatic cells. Since a male chicken (rooster) is the organism in question, the number of chromosomes in its sperm cells would be half that of the diploid number, which in this case is 40. To provide another example, if a muscle cell of a typical organism has 32 chromosomes, a gamete from that organism would have 16 chromosomes, which is half the diploid number since gametes are produced through meiosis.
The ozone layer helps to sustain terrestrial life by __________. a. absorbing incoming UV radiation b. keeping levels of ozone in the troposphere low c. maintaining the Earth's temperature structure d. all of the above
The right answer is d. all of the above.
The ozone layer is a layer of the Earth's stratosphere that lies between 20 and 50 km above sea level. It is characterized by a concentration of ozone (O3) proportionally greater than in the other layers of the atmosphere, of the order of ten parts per million (ppm).
It has the particularity of absorbing most of the ultraviolet radiation from the Sun that is harmful to life (such as UVB, which can alter the DNA).
The absorption of ultraviolet light by ozone creates a heat source that forms the stratosphere (a region where temperature increases with altitude). It plays a decisive role in the structure of the Earth's atmosphere temperature.
In the troposphere: tropospheric ozone is the one that results from human activities, particularly exhaust gases, which are subject to rigorous monitoring and warning of air quality during periods of intense heat (peak of ozone). This is the "bad" ozone, so it must remain at a low concentration.
Name three of the enzymes involved in dna replication and describe what they do.