The cell membrane controls the movement of substances in and out of cells and organelles. In this way, it is selectively permeable to ions and organic molecules.
What is the role of DNA polymerase in DNA replication?
A. It ties the chunks of DNA together.
B. It creates the replication fork.
C. It checks the DNA for errors.
D. It breaks apart the bases.
Answer: it checks the DNA for errors
Explanation:
Just took test
Answer:
A. ties chunks of dna together, took the test
Explanation:
Two different groups of scientists studying a rare trait in ground squirrels report very different heritabilities. What factors influencing heritability values make it possible for both conclusions to be correct?
Answer:
It is a trait highly influenced by environmental factors (i.e., it has low heritability)
Explanation:
In population genetics, heritability is a statistical measure to estimate the proportion of the phenotype variation of a given trait which can be explained by hereditable genetic factors. The heritability of a trait is influenced by environmental factors, genetic factors (e.g., allele frequencies, number of genes involved in trait variation, recombination rate, etc), and the interaction between genetic and environmental factors. A low heritability value suggests that most of the variation is not genetic (i.e., due to environmental factors), while a high heritability value suggests that almost all of the variability in a trait is due to genetic factors.
True or false consumption efficiency in Huckleberry patches is high like in a forest ecosystem
Answer:
True
Explanation:
particles is found in the nucleus of an atom
Answer:
protons and neutrons
Explanation:
Protons and neutrons have a positive and neutral charge, respectively. They are in the nucleus, while the negative electrons orbit the nucleus.
Answer:
Protons, neutrons, electrons
Explanation:
If you're asking about subatomic particles.
Which type of rock does B represent?
Group of answer choices
Which of the three traits considered in this film (bipedality, extensive tool use, and large brains) were present in the 3.2-million-year-old Australopithecus fossil (Lucy)?.
Answer:
The bipedality
Explanation:
One of the things the discovered fossil signified was that human bipedality was more ancient than the large brain size because Lucy actually had a small skull which could indirectly be translated to small brain size.
NOTE: Bipedality can be described to mean the ability of an organism to move about with two legs. Hence, it must have been discovered that Lucy had two legs.
what is the last thing that happens when a cell divides to produce two new identical cells
Answer:
The last phase of cell division is cytokinesis. In this phase the cytoplasm of parent cell divides in to two cells called as daughter cells. It occurs during late stages of nuclear division.
The visible change of cytokinesis in an animal cell can be observed as formation of Furrow or Pucker on the cell surface.
Homeostasis: Response to Stimuli
From the examples below, select the examples of cells or organisms responding to stimuli in order to maintain homeostasis.
1.)A plant bending toward a light source
2.)A cell bursting because it takes up too much water
3.)A person shivering when their body temperature is low
4.)A unicellular organism beating microscopic hairs to escape a chemical pollutant in its environment
5.)A cell dying due to a chemical poison
6.)An animal growing larger
7.)Ants moving within their mounds depending upon the time of day
8.)Iguanas laying in the sunlight if their body temperature is low
9.)Birds migrating when seasons change
10.)A person or animal getting sick because of infectious bacteria
part2 fill in the blank
A state of biological balance, or ____________ , is important for the survival of individual cells and ____________ alike.
Physiological factors such as ____________ , water levels, and pH must remain within a certain ____________ for cells and organisms to remain healthy and functional.
Regulation of the ____________ environment of cells and organisms is carried out through ____________ and other control ____________ .
choice of words:
location
external
hormones
mechanism
homeostasis
internal
groups
feedback
oganisms
temperature
range
Answer:
3.)A person shivering when their body temperature is low.
7.)Ants moving within their mounds depending upon the time of day
1-A plant bending toward a light source.
.-Iguanas laying in the sunlight if their body temperature is low.
.-A unicellular organism beating microscopic hairs to escape a chemical pollutant in its environment
.-Birds migrating when seasons change.
The maintenance of relatively constant internal environment of an organism is called Homeostasis.It is an automatic regulations of the body systems and organs controlled by the brain and some receptors, specific for certain body fluctuations.E.g Thermoreceptors Chemoreceptors etc.
The fluctuations in the body internal systems must be controlled within a narrow limits, for existence of living organism.The brain receives inputs from the receptors, and the outputs from the brain ensures the homeostatic control.
The above examples are typical homeostatic responses by the organisms involved, because the inputs from the receptors send signals to the brain ,and the organisms responded to these with the example above.
Explanation:
Help me guys!! (Giving brainliest)
Answer: C
Explanation:
C because the cell membrane is semi permeable which means only certain substances can enter and exit.
How are the enzymes that nerve cells produce different from the enzymes that blood cells produce? A. The molecules that nerve cells digest are more complex than those digested by blood cells. B. The genes that are activated in nerve cells are different from those activated in blood cells. C. Nerve cells contain more ribosomes than blood cells. D. Nerve cells contain more mitochondria than blood cells.
Red blood cells carry a specific type of protein, called hemoglobin, which is able to bind oxygen and release it in other tissues. A nerve cell doesn't have this protein because it doesn't need to bind oxygen. Instead, the nerve cell uses other proteins that help it transmit signals to other cells.
Why do lunar and solar eclipses not happen every month?
Eclipses only occur during full and new moons.
Earth rotates around its axis faster than the moon.
The moon and Earth only travel through the penumbras.
The moon’s axis does not always align with Earth’s shadow.
Answer:
Eclipses only occur during full and new moons. Earth rotates around its axis faster than the moon. ... The moon's axis does not always align with Earth's shadow.
Explanation:
Answer:
The moon's axis does not always align with Earth's shadow.
Explanation:
The Earth goes around the Sun, while the moon goes around the Earth, so all of them lining up exactly doesn't happen that much. I also jus got it right.
help me please !!!!!!
we find ATP
like glucose and other organic compounds
Do the same mechanisms that govern gene expression operate in bacterial cells and eukaryotic cells? Explain your answer.
Answer:
in prokaryotic cells, the control of gene expression is mostly at the transcriptional level. ... Eukaryotic gene expression is regulated during transcription and RNA processing, which take place in the nucleus, and during protein translation, which takes place in the cytoplasm.
Plz help I’ll mark brainliest
Answer:
C. The study of the interaction between living and nonliving factors in an environment
Explanation:
Ecology is the study of both living and nonliving things in an environment, the only answer that relates to this in significance is C.
a. What is the major evolutionary advantage to producing an amnion?
b. What does that mean for embryonic development for the animal phylum as compared to the animal phyla?
WHAT IS THE MAJOR EVOLUTIONARY ADVANTAGE TO PRODUCING AN AMNION?
The main evolutionary advantage of producing an amnion is that the embryos of the amniotic membrane,the amniotes are made available with their own aquatic environment,this in-turn resulted to a lesser dependence on water for it's maturation and development therefore allowing or giving room for the amniotes to branch towards environments that are drier.
WHAT FOES THAT MEAN GOR EMBRYONIC DEVELOPMENT OF THE ANIMAL PHYLUM AS COMPARED TO THE ANIMAL PHYLA?
The embryonic development of animal phylum is also known as embryogenesis.
It is the development of the embryo from the point of fertilization of an egg,(the ovum) by a sperm cell ,this makes the fertilized egg a diploid cell otherwise known as a zygote.
This zygote undergoes mitosis,a mitotic division known as cleavage and a differentiation resulting in a multicellular embryo.
This embryonic development of animal phylum comprises of 36 animal phyla.
How far do scientists estimate the plates move in a year
Answer:
10 cm
Explanation:
They can move at rates of up to four inches (10 centimeters) per year, but most move much slower than that. Different parts of a plate move at different speeds. The plates move in different directions, colliding, moving away from, and sliding past one another. Most plates are made of both oceanic and continental crust.
3. A plant cell (0.9% NaCl) is placed into a solution of 20% NaCl, the membrane is permeabl
water. What happens to the plant cell?
4. A plant cell (0.9% NaCl) is placed into a solution of 100% DI water, the membrane is
permeable to water. What happens to the plant cell?
o
w
Answer:
3. the water inside the plant cell will diffuse out from the cell following the concentration gradient. cells will be plasmolysed.
4. distilled water will diffuse into the cell following the concentration gradient. cells will be turgid
Determine the identity of an atom
Answer:
The number of protons in one atom of an element determines the atoms identity.
Examples of limiting factors
. How are mineral deposits formed around vents?
Answer:
When hot, metal-laden water spews from vents and mixes with the cold ocean, the metals precipitate. Large piles of sulfide accumulate on the seafloor and are eventually buried by sediments, modified by heat and pressure in the crust, and uplifted. Some are exposed on land when erosion removes the overlying rocks.
Forests dominated by gymnosperms tend to have mechanisms to allow it to regenerate after a fire. As a consequence this type of forest ______________.
a. dominate areas where the U.S Forest Service does not put out fires.
b. only lives 20-30 years
c. is dominated by trees of a single age
d. has no overstory species
Answer:
Forests dominated by gymnosperms tend to have mechanisms to allow it to regenerate after a fire. As a consequence this type of forest is dominated by trees of single age .
Explanation:
It is possible to conclude the question given above in many ways. After a forest fire in a specific forest patch occurs, the impacts are determined by the severity of the fire and the type of forest in which the occurrence occurs. Usually, the dramatic effect on the trees and plants that can be seen in that region can be seen after such an occurrence has occurred. In certain situations, the situation can also worsen, leading to the destruction of the entire cover, if the circumstances favor the propagation of fires. In such cases, the removal of the prevailing structure can lead to the formation of a new forest structure through a mechanism called 'succession,' in which there is a sequence of progression in a biologically acceptable manner through the growth of different plant species. Simply put, the new plants will attempt to adapt or acclimatize to the conditions introduced after forest fire in such a way that this will later provide the route for the growth of plants and trees that can not easily accommodate in the harsh conditions. Therefore, instead of the forest surviving for a short period of time following a forest fire occurrence, there would be changes in the nature of the forest. This suggests that option 'B' is not the response that is most suitable.Choice 'A' appears to be logically inaccurate, taking into account that if they are of high intensity, fires may be uncontrollable. In addition, there is no clear mention of the fire's region of origin and which trees are most affected. Typically, gymnosperms illustrate a simple process in which they can not limit their destruction from the flames, while they can provide a way for their progeny to initiate next generation development in the form of seed. This occurs in the case of Gymnosperms in which, under ordinary conditions, the seeds of the plants are enclosed within a cone that is restricted from germinating. Although the fires pave the way for the seeds to germinate under certain fire conditions, which in turn leads to the emergence of the next generation of gymnosperms, and several studies indicate that these newly introduced seeds would have the same age as choice 'C' indicated. But, as this is not under the jurisdiction of the US Forest Service, legally, option 'A' tends to be wrong. At the same time, it can be seen that forest fires are not consistent in their coverage in certain cases, and thus the chances of dispersal and germination tend to be not even and thus choice 'C' can be reported to be either correct or incorrect in all possible ways.But, first, it is important to know what an overstory is for the option 'D'. A forest consists of trees of all sizes, from the smallest to the tallest pine trees. The uppermost element that is directly in contact with the light from the sun is the overstory. The manner in which the degree of overstory damage occurs depends on the moisture content of the trees and the other associated conditions around the trees. Taking this into account, a forest fire may either lead to the loss of an entire overstory or can have impacts that are confined to plants and trees at the ground level. So, even the 'D' option can be right or inappropriate. But, therefore, choice 'C' should be the most suitable response, taking into account that most studies indicate growth of single-age trees due to germination mediated in the presence of fire. This seems to be scientifically right for a small patch where there was also fire-mediated damage. Accordingly, the most suitable response should be option 'C'.Hence , the correct option is C.
1. Does a scientific theory ever become a law? Explain
the difference between scientific theory and law.
Answer:
a theory cannot become a law
Explanation:
the difference between a scientific theory and a scientific law because a theory is an in depth explanation of an observed phenomenon. a law is a statement about an observed phenomenon or an unifying concept (i.e.: newtons law or gravity - no explanation on how it works or what it is just that it exists.)
Think critically A restaurant owner wants to serve fresh-cut fruit. What factors might be considered in choosing a recipe and preparation method
Answer:
Explanation:
1.Oxidation- some fruit after cutting on exposure to air begin to oxidate this leads to a change of color, this color change could range from light brown to dark brown in some fruits such as apple this could make it unappealing to to the consumer.
2. Shelf life- How long can the fruits start after exposure to air before it begins to loose its taste assuming they are not consumed immediately. This have to considered in selecting fruits
3. Time- How long will it take to prepare and make the fruits ready, some fruits requires some thorough cleaning, professional cutting skill
if all will be available and will meet up the time required for the fruits to be served.
All this are some of the factors needed to be considered
what does carbon footprint mean???
Answer:
A carbon footprint is the total greenhouse gas emissions caused by an individual, event, organization, service, or product, expressed as carbon dioxide equivalent.
Explanation:
Answer:
The amount of carbon dioxide a person produces
Explanation:
A plant that was grown in the dark continuously would: ________.
a. not be able to take in CO2 without sunlight.
b. remain healthy because plants have stored materials in their roots that can provide what the Calvin cycle needs.
c. not be able to split water to provide NADH.
d. continue to photosynthesize because to in carbon dioxide, the only outside input to the Calvin cycle, does not require sunlight.
Answer:
c. not be able to split water to provide NADH.
Explanation:
Photosynthesis, which is the process by which plant species obtain their energy, occurs in two stages viz: light dependent phase and light independent phase. The light dependent phase of photosynthesis requires the energy from sunlight, which is captured by the chlorophyll pigments in the leaves of the plant.
The light energy captured by the chlorophyll is used to split water molecule in a process called PHOTOLYSIS OF WATER. Overall, ATP and NADH (electron donor) are products of the light dependent stage, which enters the next stage to complete the photosynthetic process.
Therefore, a plant that was grown in the dark i.e. no access to light, continuously would not be able to capture light energy and hence not be able to split water to provide NADH.
A plant that was grown in the dark spontaneously would not possess the tendency to split water to provide NADH.
What is photolysis of water?The process by which the species of plant attain their energy, that is, photosynthesis, takes place in two stages:
Light independent phaseLight dependent phaseIn the light dependent phase, energy is needed from sunlight, and is captivated by the chlorophyll pigments present in the leaves of the plant. This energy from the light is used to split the molecule of water by a process known as photolysis of water.
The products of the light dependent stage is ATP and NADH that enters the next phase to complete the process of photosynthesis. Therefore, a plant, which was grown in the dark, that is, having no accessibility to light, would not possess the tendency to captivate the energy from the sunlight and thus would fail to split the molecule of water to provide NADH.
Thus, the correct answer is option c.
Find out more information about the photolysis of water here:
https://brainly.com/question/13984369
according to the diagram the temperature where clouds form is?
Answer:
higher than the temperature near mountains
Explanation:
Answer: C. lower than the temperature on the ground
Explanation: Because on the chart it shows the temp on the ground is 92° but then the temp where clouds form is 60°. This means that the temp at the ground is higher than the temp at 6000ft.
If the scientific name of the tiger is Panthera tigris then: to what genus do tigers belong?
Which of the following statements regarding the human
population are TRUE? Select TWO.(Remember, there is no
partial credit)
SELECT ALL THAT APPLY
The world's population of humans is
increasing.
In every country, the human population is
increasing.
In some countries, the human population is
decreasing or staying the same.
The world's population of humans is
staying constant
Answer:
The world's population of humans is
increasing.
and
In every country, the human population is
increasing.
Let's suppose you were interested in developing drugs to prevent epigenetic changes that may contribute to cancer. What cellular proteins would be the target of your drugs?
Answer:
Potential targets:
1- DNA methyltransferases
2- Chromatin modifiers such as histone acetyltransferases, histone deacetylases, histone methyltransferases, etc.
3- Components of the RNA interference (RNAi) machinery such as Dicer, Argonaute, etc.
Explanation:
Epigenetics can be defined as the study of any heritable change in the phenotype that does not involve modifications in the DNA sequence. Epigenetic mechanisms can be classified into three major types: 1-DNA methylation, 2-histone modifications (e.g., acetylation, methylation, phosphorylation, etc), and 3-regulatory non-coding RNAs (e.g., miRNAs, lncRNAs, siRNAs, etc) that modulate target gene expression via the RNA interference pathway. There are different types of proteins that are involved in these complex epigenetic mechanisms, and those cited above represent only some examples that can be used as therapeutic targets.
Given what you learned about how influenza changes over time, how could you explain the emergence of drug resistance in bacterial pathogens?
Answer:
Beneficial mutations events can generate resistance to drugs
Explanation:
Bacteria can develop antibiotic resistance through mutations, as well as horizontal transference events, that allow them to reduce/eliminate the effectiveness of drugs used to treat infections. For example, penicillin-resistant strains have been identified in Staphylococcus aureus and Streptococcus pneumoniae. In general, mutations have a negative impact on the fitness of the organism; however, there are cases where mutations increase the fitness of the individual. In consequence, antibiotic resistance may occur by natural selection, where antibiotic-resistant bacteria that exhibit beneficial mutations are selected to survive and perpetuate their genetic material.