Answer: hope the below answers will help
Explanation:
1 and 2 in this paragraph
SKILLS TO DEVELOP
Briefly describe what is meant by the endosymbiotic theory.
Give some evidence supporting the theory that mitochondria and chloroplasts may have arisen from prokaryotic organisms.
It is thought that life arose on earth around four billion years ago. The endosymbiotic theory states that some of the organelles in today's eukaryotic cells were once prokaryotic microbes. In this theory, the first eukaryotic cell was probably an amoeba-like cell that got nutrients by phagocytosis and contained a nucleus that formed when a piece of the cytoplasmic membrane pinched off around the chromosomes. Some of these amoeba-like organisms ingested prokaryotic cells that then survived within the organism and developed a symbiotic relationship. Mitochondria formed when bacteria capable of aerobic respiration were ingested; chloroplasts formed when photosynthetic bacteria were ingested. They eventually lost their cell wall and much of their DNA because they were not of benefit within the host cell. Mitochondria and chloroplasts cannot grow outside their host cell.
Evidence for this is based on the following:
Chloroplasts are the same size as prokaryotic cells, divide by binary fission, and, like bacteria, have Fts proteins at their division plane. The mitochondria are the same size as prokaryotic cells, divide by binary fission, and the mitochondria of some protists have Fts homologs at their division plane.
Mitochondria and chloroplasts have their own DNA that is circular, not linear.
Mitochondria and chloroplasts have their own ribosomes that have 30S and 50S subunits, not 40S and 60S.
Several more primitive eukaryotic microbes, such as Giardia and Trichomonas have a nuclear membrane but no mitochondria.
Although evidence is less convincing, it is also possible that flagella and cilia may have come from spirochetes.
Figure 7.8.1 : One model for the origin of mitochondria and plastids. This model has an amitochondriate eukaryote engulfing an aerobe and then a cyanobacterium. Image used with permission from Kelvinsong
EXAMPLE 7.8.1
Briefly describe what is meant by the endosymbiotic theory.
Give three points of evidence supporting the theory that mitochondria and chloroplasts may have arisen from prokaryotic organisms.
Solutions
The endosymbiotic theory states that some of the organelles in eukaryotic cells were once prokaryotic microbes.
Mitochondria and chloroplasts are the same size as prokaryotic cells and divide by binary fission.
Mitochondria and chloroplasts have their own DNA which is circular, not linear.
Mitochondria and chloroplasts have their own ribosomes which have 30S and 50S subunits, not 40S and 60S.
Summary
The endosymbiotic theory states that mitochondria and chlopoplasts in today's eukaryotic cells were once separate prokaryotic microbes.
Contributors
Dr. Gary Kaiser (COMMUNITY COLLEGE OF BALTIMORE COUNTY, CATONSVILLE CAMPUS)
Provide a summary of biologist Stephen Stearns’ findings in how Natural Selection may be working today in humans.
Answer:
Stephen Stearns states that natural selection doesn't mean the survival of the fittest organisms, but rather this mechanism is illustrated by the selective reproduction of the fittest. Natural selection can be classified into distinct types, including directional, disruptive and stabilizing selection, which are in turn based on sexual selection. These types of selection are driven by different outcomes that have different dynamics.
2. What are the two types of ecological succession?
Answer:
There are two main types of succession, primary and secondary. Primary succession is the series of community changes which occur on an entirely new habitat which has never been colonized before. For example, a newly quarried rock face or sand dunes.
Explanation:
Answer:
Ecological succession is a process of change in ecosystems that takes place over time, and that we can observe both in time and in space. ... There are two types, the primary sequence and the secondary sequence.
"I hope it helps you it was a pleasure to help you".
Explanation:
5 PLZ HELP 12points+
Select the correct answer.
If the population of rabbits in this ecosystem decreased dramatically because of certain environmental changes, which organisms’ food supply would decrease?
A.
owl and snake
B.
jackal and wildcat
C.
green plant and mouse
D.
goat and wildcat
Answer: B, the jackal and wildcat
Which explanation below is the most accurate regarding animal and plant adaptations for survival in a desert biome
Answer:
i think its C sorry if I'm wrong
Explanation:
The most accurate regarding animal and plant adaptations for survival in a desert biome is
Animals in this biome tend to have scaly skin to save water and stay cool; plants have thick roots that capture water.
What is the desert biome?Deserts are extremely dry environments that support a diverse range of plants and animals. Deserts are classified into four types: hot and dry deserts, semi-arid deserts, coastal deserts, and cold deserts.Plants adaptationPlants in the desert are succulent, storing water in fleshy leaves, stems, or roots. Water absorption is well developed in the root system. The stem in these pants also performs photosynthesis. Their stems and leaves have a thick cuticle that protects them from excessive transpiration. To avoid excessive water loss, desert plants use the CAM pathway.Animals adaptationAnimals in the desert exhibit a variety of adaptations. Snakes, for example, come out in the open only at dawn or dusk. To avoid the heat, some small desert animals live in burrows.Camels, for example, store fat in their hump. This allows them to go a long time without food or water.Thus, we can conclude that Animals in this biome tend to have scaly skin to save water and stay cool; plants have thick roots that capture water. which is option C.
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Population Genetics
Describe:
How is a population described in population genetics?
Answer:
If they would look alike
Explanation:
A biologist analyzes DNA sequences in three different primates. She finds primates "A" and "B" have almost exactly the same DNA sequences. DNA sequences in primate "C" are significantly different from those of primate "A" and primate "B". This information allows the biologist to infer that
Answer:
primates A and B are more closely related to each other than they are to primate C
Explanation:
The study and the comparison of DNA sequences of various species is used in decoding genomic information as well as determining closely related or distant related species.
Closely related species are known to have almost the same DNA sequences when studied. For example, chimpanzees are known to be most closely related to humans and this because, studies show that they share about 99% of their DNA with humans. So also, although monkey is a primate, its DNA sequences is significantly different from humans and chimpanzee, making it less closely related to either humans or chimpanzee compared to the relationship between human and chimpanzee.
The pH of a solution determines the charge of certain R groups. The pH of pineapple fruit ranges from 3.5 to 5.2. Predict the effect on the activity of bromelain if it is used in a product with a pH of 11.
Answer:
The activity of Bromine will reduce
Explanation:
Bromine is found in pineapple stem with pH range of 3.5- 5.2 this implies that the environment where bromine is found is acidic hence when taken to a product whose pH is 11 which is basic then its performance will be low because its can only function well in an acidic medium.
pH ranges tell whether a substance is acidic, basic or neural.
Acid range from 3.5-6
7- neutral
8 above is basic
This is about knowing the behaviour of some elements in different PH Values.
The activity of bromelain will decrease in a product with a pH of 11. .
We are told that the PH of pineapple fruit is of the range of 3.5 - 5.2. In reality, this also includes it's stems and the plants as well. This falls into the acidic range because PH less than 7 is acidic.Now, these stems, plants and fruits of pineapple usually contain bromelain. This implies that bromelain does its' work in an acidic environment since pineapple has an acidic PH.If bromelain is used in a product with a PH of 11, it means it is being used in a basic environment because a PH greater than 7 indicates a basic nature. This means bromelain will not function as well as it did in the acidic environment and as such the activity of bromelain here would decrease.We can now conclude that the activity of bromelain will decrease in a product that has a PH of 11.
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why is higher temperatures considered part of climate change?
Answer:
Higher temps. are considered part of climate change because of global warming and the green house effect. The Co2 or Carbon dioxide in the air causes the sun's heat to be trapped within the Earth's atmosphere.The heat being trapped makes the Earth gradually heat up. Hope this helps.
Where is DNA located in your body?
Answer:
DNA is in the nucleus of nearly every cell in your body.
Explanation:
DNA is housed in the nucleus because it is the genetic material and needs to be protected.
Answer:
The DNA is located in the nucleus.
Explanation:
Humans and animals are EUKARYOTES which means we have a nucleus, where the DNA is stored. PROKARYOTES do not have a nucleus to the DNA is stored in the cytoplasm.
~Anna
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When Aaron Burr needed to cross a stream, he used
several board's to build a makeshift bridge.
2 Polnis
What do members of a population have in common? Select all that apply.
A. They live in the same area.
B. They have the same density
D
C. They are the same species.
D. They live at the same time.
E. They are the same size
Answer:
the answers are a, c, and d
Explanation:
a makes sense because if you are a member of a population then the other members live in the same area as you
b doesn't make sense because even though you live in the same population as someone, it doesn't mean you'd have the same density
c makes sense because the definition of population is, "a group of individuals of the same species living and interbreeding within a given area."
d makes sense since in order to be considered a member of a population you have to be living
e doesn't make sense since everyone is a different size
Members of a population have in common -
A. They live in the same area.
C. They are the same species.
D. They live at the same time.
A population is defined as a group of individuals of the same species living and interbreeding within a given area.
Members of a population often rely on the same resourcesare subject to similar environmental constraintsdepending on the availability of other members to persist over time.They are the same speciesThus, Members of a population have in common -
A. They live in the same area.
C. They are the same species.
D. They live at the same time.
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true or false aerobic cellular respiration produces more atp then anaerobic cellular respiration
Answer:
true
Explanation:
which bone layer holds calcium and other minerals
Answer:
In addition to its mechanical functions, the bone is a reservoir for minerals (a "metabolic" function). The bone stores 99% of the body's calcium and 85% of the phosphorus. It is very important to keep the blood level of calcium within a narrow range. If blood calcium gets too high or too low, the muscles and nerves will not function. In times of need, for example, during pregnancy, calcium can be removed from the bones. This process is carefully regulated by hormones and is discussed more completely in the section about hormones.
Explanation:
Answer:
its the um (dont quote me ) phophorus im pretty sure
Explanation:
WHY is this football player wearing an oxygen mask? what is the importance of oxygen here? What is he trying to avoid by wearing the oxygen mask?
Answer:
bc oxygen contributes to muscle performance on and off the field.
If you drive at 100 m/s for 36,000 s how far will you go ?
Answer:
Distance = 3,600,000 m
Explanation:
Distance = Speed × Time
Distance = 100 × 36,000
Distance = 3,600,000 m
What do you think the word biodiversity means? Why is biodiversity important for the stability of ecosystems?
Answer:
Biodiversity refers to the variety of species in an ecosystem. Generally, ecosystems with high biodiversity are more likely to survive environmental changes. Therefore, biodiversity is important to ecosystem stability.
Energy from the sun is transferred from plants to animals when___________________
animals lay in the sun during the day
A. when plants make food using the energy of the sun then animals eat those plants
B. animals drink water
C. animals store energy by sleeping
D. animals lay in the sun during the day
Answer:
A. when plants make food using the energy of the sun then animals eat those plants
Explanation:
Animals are heterotrophs and therefore unable to produce their on food chemically, so they consume or absorb it from plants or other animals that have eaten the plants.
the following facts are true about resource A
. it grows in nature and takes about five years to reach a mature size.
.it can be replanted after it is cut down
resource A is most likely an.
A. inexhaustible resource
B. nonrenewable resource
C. recycled material
D. renewable resource
Answer:
Option D, renewable resource
Explanation:
A renewable resource is the resource which can be replenished after every use. Or in general the time taken by it to replenish must be small. For instance, fossil fuels too are renewable but the time taken by them to renew is too high and hence they are also considered as non-renewable.
Also renewable resources can be used again and again.
Hence, option D is correct
Astronauts have been exploring outer space in manned spacecraft since 1961. Which of the following would have made it very dangerous for people to explore outer space?
A.
if the Earth's orbit passed through dense meteoroid fields
B.
if there were fewer cosmic rays passing through the solar system
C.
if the asteroid belt was farther from the Sun
D.
if the Earth's orbit was more circular than Venus' orbit
Answer:
B because it makes more sense
Explanation:
it makes more sense
What is required for both the light-dependent and light-independent reactions to proceed?
energy
CO2
water
ATP and NADPH
Answer:
A.Energy
Explanation:
I Got it right :_
Answer:
A.)energy
Explanation:
i took the test : )
Over time, what happens to a trait that is an advantage to an organism?
Matter at rest will:
A. gain Mass
B. Stay at rest
C. Move on its own
D. Gain kinetic energy
Answer:
D. Gain kinetic energy
Do you think exposure to Earth’s Magnetic field could cause people to have paranormal sensations?
Answer:
Yes I do think it would cause paranormal activity.
Explanation:
Because of the atmosphere and the layers of the atmosphere we are protected from the powerful rays of the Magnetic field. So if we were exposed to the Magnetic field we would act weird or paranormal.
Which resource is a renewable resource?
A. Coal
B. Gemstones
C. Metal
D. Trees
Answer:
d. trees
Explanation:
cuz i took the quiz on edge
Suzy knows that an individual’s sex is determined by sex chromosomes. She knows that females have two X chromosomes and males have one X and one Y chromosome. She creates the Punnett square cross below to show sex inheritance. She wants to know which parent determines the sex of a baby---is it the mother, father, or both? Complete this cross. What would you tell Suzy? Why? Suzy knows that an individual’s sex is determined by sex chromosomes. She knows that females have two X chromosomes and males have one X and one Y chromosome. She creates the Punnett square cross below to show sex inheritance. She wants to know which parent determines the sex of a baby---is it the mother, father, or both? Complete this cross. What would you tell Suzy? Why?
She creates the Punnett square cross below to show sex inheritance. She come to know that both parent determines the sex of a baby and it is when you put xx and xy on a punnet square there are equal amounts male and female.
How Human sex gets decided?Human sex gets decided by the function of SRY gene which possessed by with or without of Y chromosome. The hormone of anti-mullerian and testosterone produced from cells when activating the SRY gene. It generally confirms the development of single-male reproductive systems.
The scenario in humans, the sex ration gets affected by the male parent's hormone level. Also, in XY sex evaluation system, the sperm of male takes part in X or Y chromosome whereas the ovum from female contributes to X chromosome. This greatly results in offspring - either male (XX) or female (XY).
Therefore, She creates the Punnett square cross below to show sex inheritance. She come to know that both parent determines the sex of a baby and it is when you put xx and xy on a punnet square there are equal amounts male and female.
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Choose an organism to use as an example.
Answer:
Bacteria
Explanation:
humans, plants, fungi and bacteria are a type of organism
what systems do you use when you have a scrape knee
Answer:
cleaning alcohol. polisporin. and bandades
Explanation:
Answer:
You use the immune system
Explanation:
it play a crucial role in the process of wound healing
Help.. 14 _____ are substances that can cause cancer.
15
Scientists join cancer cells with antibody-producing white blood
cells to produce _____.
Answer:
14. Carcinogenic
15. Not sure. I believe it is monoclonal antibodies.
What type of relationship where both organisms benefit
Answer: mutualism!
hope this helps! recently learned about this. :D
why is it important for your body to return to its balanced and steady state
Answer:
to maintain a constant body temperature
Explanation:
