Answer:
D:D. It is a property that does not change regardless of the amount of a substance you have.
Explanation:
Melting and boiling points are two chemical properties of a substance. These are used to identify whether a substance is solid, liquid, or gas.
The melting point is the temperature at which solid-state changes into liquid state. The boiling point is defined as the temperature at which liquid changes to gas.
The melting and boiling point are intensive properties that are independent of the amount of substance to be identified.
Hence, the correct answer is "D. It is a property that does not change regardless of the amount of a substance you have."
The most efficient control of eukaryotic gene expression is achieved at the level of.
Answer:
Maybe epigenetic level
Your science class has taken swabs throughout the school. The image shows the
petri dish containing a bacterial culture that developed from a swab of one computer keyboard in the classroom. You would like to make a detailed observation of the internal structures of the bacteria in your culture. You know
that In order to see just their shape, it is necessary to use a magnification of
about 400x to 1000x. Based on this, develop a logical argument for using a transmission electron microscope.
A. The TEM magnifies 1,500,000X and produces a 3D image.
B. The TEM produces a 2D image of whatever specimen you are viewing.
C. The TEM magnifies up to 200,000X and you can see great detail, including the internal structure of cells.
D. In order to keep the students safe, the bacteria must be dead before viewing with any microscope.
Answer:
The TEM magnifies up to 200,000X and you can see great detail, including the internal structure of cells.
Explanation:
took the quiz and got all correct. good luck!
Answer:
The TEM magnifies up to 200,000X and you can see great detail, including the internal structure of cells.
Explanation:
A complex series of events involving increased blood flow, recruitment of immune cells and clotting chemicals to enhance the body's immune system is called a(n)
Answer:
An immune response is a complex series of events involving increased blood flow, recruitment of immune cells and clotting chemicals to enhance the body's immune system.
Explanation:
An immune response is the body's response mechanism to protect itself from invasion by pathogens such as parasites, bacteria, viruses and fungi.
The immune response is composed of two systems or branches: (i) the innate immune response and (ii) the adaptive immune response.
Innate immune response: the innate immune response is an inborn or natural response mechanism which provides the body with its first line of defense against infection. It is composed of two parts (i) the physical and chemical barriers such as the skin and mucous membranes, and (ii) no-specific innate response which involves cytokines, complement proteins as well as phagocytic cells such as neutrophils, basophils and mast cells.
Adaptive or acquired immune response: This is a specific immune response to previously encountered pathogens. It include cells such as dendritic cells, T cell, and B cells as well as antibodies.
B cells are responsible for immune response involving antibodies, whereas T cells are involved in immune responses by the immune cells.
1. For the following decide if they are density dependent (size matters) or density independent (size doesn’t matter will happen anyway) (Population Growth slideshow 16/17)
a. Weather (snow, rain, drought)
b. Predation
c. Competition
d. Natural disasters (hurricane/tornado/earthquake/floods/drought)
2. Define Carrying capacity (Population Growth slideshow 10-14)
3. HIghlight the factors that would be affected if a population would be near carrying capacity: unlimited
food, limited space/shelter (habitat), unlimited water, disease, predation, competition (Population
Growth slideshow 12/13, 16/17)
4. When given a table of the following numbers of a species, determine the carrying capacity: 100, 97,
100, 101, 99, 100, 98. (Population Growth slideshow 12)
5. Briefly describe a predatory/prey boom bust graph. (Population Growth slideshow 18)
6. For the following decide if they are abiotic (non living) or biotic (living): (ecology slide show slide 3)
e. Food f. Disease
g. Human activities (deforestation, dams)
NOTE: Human activities are anything involving humans and can include use of pesticides, herbicides, our
contribution to climate change, habitat loss and destruction, poaching/hunting, etc.
a. Bacteria
b. pH level
c. fungus
d. plants
e. oxygen availability
f. Sunlight
g. water
h. animals/parasites/predators i. pollution
7. Be able to apply the 10% rule when given a pyramid or a food chain/web (ecology slideshow 20-23) Remember just move the decimal point 1 time for each step. The other 90% of energy is lost as heat energy.
In the following food chain what amount of energy does the snake have if the seed starts with 29345 kcal of energy?
Seed→mouse→snake→ hawk.
Remember the further away from the plant (autotroph) the less energy you have. Bacteria feed on anything that dies.
8. What type of energy is lost during food chains/webs? (HInt 10% rule, plants give energy to animals then they give energy to bacteria when they die (bodies decomposed))
1) DI: a,d,g. DD:b,c,e,f. 2) K is a constant equal to the population size at the equilibrium. 3) 2,4,5,6. 4) 100. 5) Prey population size is followed by predator population size. 6) B: a,c,d,h. A: b,e,f,g,i. 7) 293.45 kcal. 8) caloric energy.
1) What are density dependent or independent factors?
These are limiting factors that affect the carrying capacity.
Density-dependent, DD, factors are a result of the population size
Density-independent, DI, factors do not depend on population size. These are human impact, weather, or natural disasters
a. Weather (snow, rain, drought) → Density-independent
b. Predation → Density-dependent, DD
c. Competition → Density-dependent, DD
d. Natural disasters → Density-independent, DI
e. Food availability → Density-dependent, DD
f. Disease → Density-dependent, DD
g. Human activities (deforestation, dams) → Density-independent, DI
2) What is carrying capacity?Carrying capacity (K) is the maximum point at which the environment can support a growing population. It is a constant equal to the size of the population (N) at the equilibrium point when the natality rate and the mortality rate get equal to each other.
3)
unlimited food → No, because it is unlimitedlimited space/shelter (habitat), → Yes, because it is limitedunlimited water → No, because it is unlimiteddisease → Yes, because it is dense-dependentpredation → Yes, because it is dense-dependentcompetition → Yes, because it is dense-dependent4) 100 is the number of individuals in a species that equals the carrying capacity.
When the population reaches 100 individuals, K = N = 100, it reaches an equilibrium. If it keeps growing N = 101, it must decrease dropping to N = 99.When N < 100 it can still grow. 5) What is the predator-prey model?When a prey lives in the ideal environment with no predators, it shows an exponential growth rate.
Prey can grow, develop, and reproduce, increasing its population size.
But when predators appear, the more available items, the more predator there will be.
The predator population increase in size, decreasing the prey populations size. So there are fewer available items to prey on.
The prey population also affects the predator population. The predator depends on the prey density. The more predators there are, the fewer prey there will be left.
The predator population decreases exponentially due to the item's lack. The predation rate depends on density as well as natality and mortality rates.
Predatory/prey graph,
The graph shows the variation in population size of predators are preys with time. For a better understanding look at the attached files.
1. prey population increases in size → red line
2. predator population increases in size → green line
3. prey population decreases in size → red line
4. predator population decreases in size → green line
6) What are biotic and abiotic factors?The ecosystem is composed of living and non-living things that interact and depend on each other.
Abiotic factors are physical and chemical things of the ecosystem that do not include any living elements. Biotic factors are all the living components in the ecosystem.a. Bacteria → Biotic, B
b. pH level → Abiotic, A
c. fungus → Biotic, B
d. plants → Biotic, B
e. oxygen availability → Abiotic, A
f. Sunlight → Abiotic, A
g. water → Abiotic, A
h. animals/parasites/predators → Biotic, B
i. pollution → Abiotic, A
7) What is the 10% rule?From the energy that reaches the earth's surface, only 0.1 or 1% is taken by autotroph organisms. This small percentage of energy flows through all organisms in the ecosystem until it dissipates in the environment.
The 10% rule states that only about 10% of the energy stored as biomass at one trophic level, ends up as biomass at the next trophic level.
The progressive reduction of energy determines the number of trophic levels (4 or 5).
Seed → 29345 kcal of energy
⇒ 10% of 29345 kcal is 2934.5
The mouse gets 2934.5 kcal of energy
⇒ 10% of 2934.5 kcal is 293.45
The snake gets 293.45 kcal of energy
⇒ 10% of 293.45 kcal is 29.345
The hawk get 29.345 kcal of energy.
According to these calculations, the snake have 293.45 kcal of energy.
8) What type of energy is lost during food chains/webs?Producers receive luminous energy from the sun, and they store 1% of it.
Consumers along the trophic web receive 10% of chemical energy from the direct anterior link. The remaining energy is lost as caloric energy.
The correct answer is caloric energy.
You can learn more about
density dependent/independent factors at https://brainly.com/question/6675324
carrying capacity at https://brainly.com/question/2375972
predator-prey model at https://brainly.com/question/22122240
biotic/abitoc factors at https://brainly.com/question/1542938
10% rule at brainly.com/question/11665402
Hello people ~
If natality is balanced by mortality in a population at a given time, there will be a/an
(a) decrease in the population size
(b) increase in the population size
(c) zero population growth
(d) population explosion
(c) zero population growth
natality - birth rate
mortality - death rate
when birth rate and death rate are equal. the population remains constant and does not change. nor increase nor decrease.For example, the birth rate in a country is 500 and death rate is 500. both balanced. 500 - 500 = 0, zero growth in population.
Which statement correctly describes the difference between meiosis I and
meiosis II?
A.
Meiosis I brings together sister chromatids, and meiosis II separates them.
B.
Meiosis I separates tetrads, and meiosis II separates sister chromatids.
C.
Meiosis I separates sister chromatids, and meiosis II separates tetrads.
Answer:
C
Explanation:
Because
The soybean aphid was introduced to the United States in 2000. The aphid killed many soybean plants. In 2004, scientists
discovered that some soybean plants were resistant to the aphid. This resistance was genetically based. The scientists
wanted to determine whether the resistant trait in these soybean plants has a dominant inheritance pattern. Which of the
following would provide the best evidence that the trait is dominant?
Answer:
The soybean aphid was introduced to the United States in 2000. The aphid killed many soybean plants. In 2004, scientists discovered that some soybean plants were resistant to the aphid. This resistance was genetically based. The scientists wanted to determine whether the resistant trait in these soybean plants has a dominant inheritance pattern. Which of the following would provide the best evidence that the trait is dominantFor all cells where protein synthesis occurs, which base pair is found only in mRNA?
Answer:
Adenine (A) pairs with Uracil (U) in MRNA
Explanation:
Uracil replaces Thymine (T) when MRNA occurs. This is because Uracil is energetically less expensive to produce than Thymine.
Types of organisms that are photosynthetic primary producers are plants and what else ?
All cells are surrounded by a cell membrane. Which statement is NOT an accurate description of a cell membrane? a Regulates what enters and leaves the cell. b Responsible for the formation of ATP c Provides protection and support for the cell. d Flexible and made up of smaller molecules such as lipids and proteins
Answer:
The correct answer is - b. Responsible for the formation of ATP
Explanation:
The cell membrane is the outer membrane of all types of the cell including eukaryotic, and prokaryotic cell. The cell membrane surrounds the cytoplasm and cell organelles.
The cell membrane is made up of phospholipids that have a hydrophilic and hydrophobic region in the lipid bilayer. The main function of the cell membrane is to protect the cell, provide support, and regulation what enters and leaves the cell. ATP formation is not produced by the cell membrane.
Mendel bred an unknown plant displaying a dominant phenotype with an individual showing the recessive phenotype; then, he analyzed the offspring to determine the unknown genotype. This experiment is called a(n)
What Mendel did according to the illustration would be called test-crossing.
Test-crossingIn genetics, test crossing is a procedure through which the zygosity of an individual can be determined - whether it is homzygous or heterozygous.
Test crossing requires that an organism who displays a dominant trait but whose zygosity is unknown is crossed with another organism of the same species but who displays the recessive version of the same trait.
By so doing and using the knowledge of probability, the resulting offspring from the cross will be used to determine the zygosity level of the parent.
More on test crossing can be found here: https://brainly.com/question/16805498
What is the major ion in seawater?
sodium
sulfate
chloride
magnesium
Answer:
Chloride is the first major ion in seawater
Explanation:
That is the first one out of those in the list of seawater ions, so I'm assuming that its correct.
Prior to cells growing and dividing the chromosones, which are made of DNA, are copied. This process is known as...
A) Transcription
B )Translation
C) Replication
D) Duplication
The parietal cells of the stomach secrete ______________, while the chief cells secrete ______________.
Explanation:
The two main types of exocrine secretory cells of the stomach are parietal cells and chief cells. Parietal cells secrete hydrochloric acid and chief cells secrete digestive enzymes such as pepsin
Filling the gaps of the excerpt in the question
The parietal cells of the stomach secrete ___Hydrochloric acid___________, while the chief cells secrete ___Digestive enzymes _
What are parietal cells ?Parietal cells are epithelical cells found in the gastric glands in the human stomach which secerete hydrochloric acids while the chief cells are basophilic cells that are located in the bottom of the gland they produce digestive enzymes such as pepsin.
Hence we can conclude that the answers to the question are as listed above.
Learn more about Parietal cells : https://brainly.com/question/7277347
21. Place the events in the correct order:
1.DNA polymerase adds nucleotides in the 5' to 3' direction
2. Replication fork is formed
3.DNA polymerase attaches to the primer
4.Okazaki fragments are bound together by ligase
5. DNA helicase unwinds DNA
Answer:
DNA helicase unwinds DNA
Replication fork is formed
DNA polymerase attaches to the primer
DNA polymerase adds nucleotides in the 5' to 3' direction
Okazaki fragments are bound together by ligase
Explanation:
There was a change in the environment between generations 10 and 30.the change likely?
Answer:
the changes were genetic mutations
Explanation:
Answer:
Favored Trait A
Explanation:
Please answer the question which I attached to this file
50% & 50%
Explanation:
PLEASE HELP!
Match the amount of carbon to each description.
1. The amount of carbon dioxide human activities put into the atmosphere annually in the present day
2. The amount of carbon in the atmosphere
3. The amount of carbon stored in fossil fuels
answers
1.
10 gigatons
2.
840 gigatons
3.
10,000 gigatons
Based on current data;
The amount of carbon dioxide put into the atmosphere annually dueto human activities is 840 gigatonsThe amount of carbon in the atmosphere is 10 gigatons The amount of carbon stored in fossil fuels is 10,000 gigatonsWhat is the carbon cycle?The carbon cycle a cycle showing how carbon is recycled between the atmosphere and earth.
The carbon cycle ensures that their is a balance of carbon in the atmosphere as well as on earth.
Human activities have increased the amount of carbon in the atmosphere.
The amount of carbon dioxide human activities put into the atmosphere annually in the present day is 840 gigatons.
The amount of carbon in the atmosphere is 10 gigatons
The amount of carbon stored in fossil fuels is 10,000 gigatons
Therefore, it can be concluded that human activities disrupt the carbon cycle.
Learn more about carbon cycle at: https://brainly.com/question/24293689
________ cannot be created or destroyed. It can only be transformed (from one type of energy to another, such as chemical energy to electrical energy when a toy uses a battery) or transferred (from one place to another, such as a hot coffee mug to your hand).
Answer: Energy
Explanation: Energy can neither be created nor destroyed; energy can only be transferred or changed from one form to another.
Answer:
Energy
Explanation:
Based on your knowledge of the water cycle, from what bodyof water does the most water evaporate? Why?
Answer: oceans
Explanation: oceans have a greater surface area. over 70% of the Earth’s surface is covered by water.
When gaseous water transitions into a liquid during the water cycle, this is known as condensation. Which of the following is an example of condensation?
A.
the formation of clouds
B.
the melting of mountain snow
C.
the falling of freezing rain
D.
the evaporation of ocean water
(a) Waves P and Q have the same __________, but wave P has twice the __________ of wave Q.
Answer:
(a) Waves P and Q have the same wavelength but wave P has twice the amplitude of wave Q.
(b) Waves Q and R have the same amplitude but wave R has twice the wavelength of wave Q.
(c) Wave T shows a steady frequency but changing amplitude.
(d) Wave S shows steady amplitude but a changing frequency.
e) Waves Q and R have a low amplitude and a steady frequency.
Explanation:
the pupil, which is the hole located in the center of the iris of the eye, controls the amount of light that gets into
Answer:
Then it hits the lens and then the retina
Explanation: The light that is let in decides the size of the pupil
Why do large herds of animals in the savanna migrate each year?.
Many animals of the savanna migrate throughout the year, searching for food and water.
Answer: To follow the growth of grass and move to the new grassy regions
Explanation:
What glands produce an oil that keeps the skin and hair soft and also acts as a barrier against bacteria?.
Answer:
sebaceous glands
Explanation:
The sebaceous glands secrete sebum into hair follicles. Sebum is an oil that keeps the skin moist and soft and acts as a barrier against foreign substances.
Hope that helps:)
What are the reactants and products of the light reactions?
Answer:
ummm
Explanation:
Answer:
glucose and oxygen
Explanation:
One of the principles of cell theory states that all cells come from.
Answer:
other cells
Explanation:
Which of the following is a disadvantage of rain forest agroforestry compared to slash-and-burn farming methods?(1 point)
faster rates of deforestation
prevention of soil erosion
increased start-up costs
decreased shade for crops
Answer: increased start up costs
Explanation:
Increased start-up costs are a disadvantage of rain forest agroforestry compared to slash-and-burn farming methods.
What is agroforestry?Agroforestry refers to the human practice where trees and shrubs are combined to generate a sustainable system.
This combination is made to generate a sustainable crop and animal farming system.This type of combination exhibits ecological advantages, but it may be cost expensive.In conclusion, increased start-up costs are a disadvantage of rain forest agroforestry compared to slash-and-burn farming methods.
Learn more in:
https://brainly.in/question/13222236
Water is the biggest component of matter in an organism.
True
False
Answer:
True
Explanation:
Which of the following organisms is the most harmful to the tree it grows on? a. strangler fig b. orchid c. spanish moss d. none of the above please select the best answer from the choices provided a b c d
Answer:
Option A
Explanation:
Strangler figs are known for their growth upon host trees robbing them of their light,water and nutrients and this often leads to the death of the host tree
Answer:
A. Strangler fig