The endoplasmic reticulum (ER) is an organelle that plays crucial roles in a number of cellular activities, including as protein secretion, lipid production, and intracellular calcium homeostasis which are necessary for cell survival and regular physiological operations. The cell cannot exist without the endoplasmic reticulum.
Endoplasmic reticulum is the network of tubes and sac-like structures in a cell's cytoplasm, which resembles gel. The endoplasmic reticulum transports chemicals and proteins. The endoplasmic reticulum's outside surface can be either smooth or rough. The rough endoplasmic reticulum produces the necessary proteins for the cell and has several ribosomes on its surface. Other compounds that the cell requires, such as lipids (fats) and carbohydrates, are produced by the smooth endoplasmic reticulum (sugars). A cell organelle is the endoplasmic reticulum.
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What is ecological succession? Choose the BEST answer.
A. how animals evolve
B. how environments evolve
C. how plants evolve
Answer:
B. how environments evolve
Explanation:
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Which of the following is a consequence of populations with little genetic diversity?
Ability to withstand environmental pressures
Risk of decline or extinction
Protection against spread of disease
Increased reproductive success
Answer: 1 people would be more vulnerable to disease
2 human or anything wouldnt live as long.
or if this a b c d choice it would risk of decline or extinction
Explanation:
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Answer:
i thick is a garlic and ramps
Explanation:
Ramps are the name of the American wild garlic (Allium tricoccum) and can be used in the same way as our native wild garlic
Answer:
a. garlic and ramps
Explanation:
they have the genus name:allium
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Which star could die in a supernova?
Sirius B
Deneb
Procyon
Answer:
Deneb
Explanation:
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Which level(s) of organization would NOT have biodiversity? Choose all that apply.
organism
population
community
ecosystem
Answer:
organism and population
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What situation most likely explains the occasional high frequency of certain inherited disorders among human populations established by a small population?
Bottleneck effect, increasing the gene pool of the population
Mutations resulting in neutral changes to genotype
Gene flow and migration of populations of diverse individuals
Founder effect, due to a limited number of individuals from a parent population
Answer: Founder effect, due to a limited number of individuals from a parent population brainliest?
Explanation:
Answer:
The founder effect is genetic drift attributable to colonization by a limited number of individuals from a parent population.
Which of the following is the best summary for the function of the kidney?
A.
The kidney processes blood, sending nutrients to the bladder to be removed.
B.
The kidney filters the blood, keeping nutrients and getting rid of wastes.
C.
The kidney stores the blood so that it can use the nutrients.
D.
The kidney receives the used blood of the body and sends it all to the bladder.
Answer:
B.
Explanation:
In a cow that is heterozygous for long hair (LI), what is the probability that its egg cell will contain the dominant allele L?
0%
75%
50%
100%
ОО
25%
Answer:
50 50 you have a large letter an a lil one that means one's dominant an the other isn't
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A) In what type of ecosystem do turtles lay their eggs?
B) some actions of the human being, such as the excessive construction of houses, shops and streets close to the beaches, harm the laying of turtle eggs. Establish a relationship between these actions and the location of the ecosystem where they lay eggs.
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Which of the following is correct about mutations and genetic variation?
It must be present in a population before natural selection can act upon the population.
It arises in response to changes in the environment.
It tends to be reduced when diploid organisms produce gametes and reproduce.
It is created by the direct action of natural selection.
Answer:
a. It must be present in a population before natural selection can act upon the population.
Explanation:
Genetic variation is the difference in the DNA sequences in individuals, which makes a member of a species different from another member of the same species. It can also be said to be the differences in the genetic make up of individuals of a species population.
Genetic variation must be present in a species population before evolutionary mechanisms, such as evolution, can occur. Genetic variation must be present in a population of a species before natural selection can act upon the population, as natural selection can only increase or reduce the frequency of alleles present in the species population already.
Genetic variation in a population of species is important for natural selection to occur.
The true statement is that; "genetic mutation must exist before natural selection can act on it."
What is natural selection?The term natural selection refers to the fact that traits that are more favorable to enable an organism to survive and reproduce tend to persist in the population.
These traits usually occur due to genetic mutations. In a population, genetic mutation must exist before natural selection can act on it.
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Answer:
D
Explanation:
70 plus 30 = 100%
How do you call the center point on the surface of an earthquake?
Answer:
Hypocenter or epicenter
(two different things)
Explanation:
The hypocenter is the point within the earth where an earthquake rupture starts.
The epicenter is the point directly above the hypocenter and is on the surface of the Earth.
why are there black holes on the moon
What types of technology are now available that would help reduce the negative impacts of sandstorms
Answer: Sandstorm is a storm which occurs when the wind currents are fast and they take away the sand from desert and other arid areas which impact the neighboring residential area.
Explanation:
The following are the technological measures that can be taken to reduce the effects of sandstorms:
1. Meteorological department must take initiative to aware people before sandstorm.
2. All buildings must have sandstorm alert alarms which are sensitive to sand so that people get aware about sandstorms.
3. Window pane must be regulated automatically to detect high speed wind currents to protect the lives inside the house.
Which greenhouse gas is produced by commercial refrigeration and air conditioning systems?
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carbon dioxide
fluorinated gas
nitrous oxide
methane
Answer:
fluorinated gas
Explanation:
Which greenhouse gas is produced by commercial refrigeration and air conditioning systems? carbon dioxide fluorinated gas nitrous oxide methane
✓ fluorinated gas
Which of these processes is most important for a person to replace worn-out body cells?
1. Adhesion
2. Cohesion
3. Mitosis
4. Photosynthesis
Answer:
Mitosis
Explanation:
Mitosis produces new cells, and replaces cells that are old, lost or damaged for a person's body cells.
How is it that the order of colors of the rainbow is always the same
(ROYGBIV)
Answer:
The color of order
The pattern of light is always the same in a primary rainbow because each color is reflected at its own particular wavelength. In a primary rainbow, the colors will be in the order of red, orange, yellow, green, blue, indigo and violet.
Explanation:
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Answer:
Red, Orange, Yellow, Green, Blue, Indigo and Violet
Realiza un texto informativo, siguiendo su estructura y sus características. Con su respectiva ilustración Ilustra y describe un cuento inventado, siguiendo su estructura y sus elementos. De color rojo subraya el título del cuento. De color verde subraya los personajes principales. De color amarillo subraya los personajes secundario De color azul los personaje terciaros (si es que tiene) De color morado subraye el tiempo y el espacio.
what is a transgenic organism?
a. an organism that is an exact clone
b. an organism that has a mixture of DNA
c. an organism that has no DNA
d. an organism with DNA from another organism
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Explanation:
Species
Genus
Family
Order
Class
Phylum
Kingdom
Domain
What ways can you get immune to viruses?
Answer:
n a nutshell, eating healthily, unprocessed foods, staying active and getting enough sleep are the simplest way to ensure your immune system is healthy enough to fight off germs.
Explanation:
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Which of the following is correct?
A. The main difference between plants and animals is their method of nutrition and movement.
B. An animal which hibernating is not alive because it doesn’t eat of move.
C. All organisms are multicellular
D. All living things carry out six life processes.
Answer: A
Explanation:
Because its the main difference between the 2
Answer:
its A because the main difference bettween plants and animals is the cells its not B because animals dont die when they hibernate
its not C because viruses are are single sellular organisms
so that levaes D
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Explanation:
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Answer:
B. Single replacement reaction
Explanation:
A single displacement reaction is a chemical reaction in which one element is replaced by another in a compound.
what is the difference between an organism and a population in an ecosystem?
Answer:
Explanation:
An organism refers to a single individual living in an ecosystem and population refers to a group of organisms living together in the same area.
Answer: A population in an ecosystem is the amount of species living in that ecosystem, while an organism is a single living entity.
When it is summer in the U.S, why is it winter in South America?
Answer:
the suns on the other side of the earth at the time
Explanation:
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Answer:
The Earth is tilted at an angle of about 23 degrees, which means that depending on where Earth is on its orbit, one pole will be getting more hours of light (summer) and one will be dark (winter).
Explanation:
Also, the earth is tilted on it's axis so more direct rays of sunlight hit the southern hemisphere making it summer in that hemisphere while it is winter in the northern hemisphere. Six months later, this reverses, and more direct rays hit the northern hemisphere. That's why it's summer here while it's winter there.
The earth's distance from the sun has nothing to do with it. It's all about the axial tilt.
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Organisms are classified into kingdoms primarily on the basis of
A)behavior
B)structure
C)size
D)habitat
Answer:
B Structure :)
Explanation:
Why does the grass look green under sunlight and black under the moonlight?
Answer: The original colour of grass is green because of photosynthesis. But in terms of reflection, it looks green because the sunlight reflects the green colour off the grass, so we see it as green.
Explanation: Sun appears white, but it is made up of the colors: red, orange, yellow, green, blue, indigo, and violet. When white light hits an object, it absorbs some colors and reflect the others. Grass appears green because it absorbs all the wavelengths except green. Green is reflected off the grass, so we see grass as green. The moon doesn’t have light of its own, the moon lights up because of the sun. So at night, as the light of the sun doesn't reach the grass directly because of the moon, it doesnt reflect any color off the grass, and so our eyes detect grass as black.
Compare the characteristics of mammals & flowering plants'
Answer:
they are both the same
Explanation:
science
how does the thyroid gland help maintain and regulate calcium?
Answer:
When the calcium level is high in the bloodstream, the thyroid gland releases calcitonin. Calcitonin slows down the activity of the osteoclasts found in bone. This decreases blood calcium levels. When calcium levels decrease, this stimulates the parathyroid gland to release parathyroid hormone.
What stage ensures that each cell receives an identical set of DNA during mitosis?