Answer:
Mitosis.
Explanation:
In mitosis parent cell is divided into two identical daughter cell. In meiosis parent cel is divided into four daughter cells.
What is the difference between a
virus and a bacterium (bacteria) in
terms of their structure and
functions?
Answer:
There are many answers...
Explanation:
Bacteria are single-celled, living organisms. They have a cell wall and all the components necessary to survive and reproduce, although some may derive energy from other sources. Viruses are not considered to be “living” because they require a host cell to survive long-term, for energy
Micro: Step 1: Respond to the following:
Discuss the major differences between the innate and adaptive host defenses. Describe in detail
humoral and cell-mediated immunity, with an emphasis on the cell types involved, and effectiveness of
the overall immune response. How do the humoral and cell-mediated immune responses differ? How
do they compliment each other to produce an effective immune response and build immunity?
Answer:
The adaptive immunological response differs from the innate in that the innate defense is with the defense mechanisms with which we are born, such as mucous secretion, fur, physical protection barriers such as skin and mucosa, while the adaptive defense is that which We adopt throughout our lives, such as through breast milk (antibodies), exposure to pathogens, vaccines, etc.
The humoral immunity is the immunological part that is in charge of transmitting signals, that is to say that the cellular immunity will work according to the chemoxtasis or chemical signals that the humoral immunity gives it, specifically we refer to chemoceptors, proinflammatory or anti-inflammatory cytokines such as interleukins , and the chemical compounds released by the cells presenting antigens and mediating inflammation.
The humoral immunity, then, in simple words, are the chemical signals that together with the defense cells make up a signaling network to be able to defend ourselves effectively against pathogenic microorganisms and thus be able to have antibodies against them for a second infection encounter, favoring thus immune or acquired memory.
These humoral responses differ from whether they are proinflammatory pictures, where inflammation is promoted or anti-inflammatory, where the function is to repair tissue damaged by oxygen radicals or other agents harmful to tissue during defense mechanisms.
All these immunities complement each other to give the best immunological response, but it would be necessary to add to the surveillance immune response that is responsible for preventing cell malformations or mutations so as not to develop malignant neoplasms, these methods are based on the induction of self-destruction of those cells mutated due to the induction of the defense that perceives these mutations.
In addition, there is the defense that is in charge of being the first line of defense, where the nuclear polymorphs are the first cells to reach the area of injury or infection, and continue with the line of antigen presenting cells, which These will present the pathogenic microorganisms to those cells that can form antibodies against this pathogen, that is, trigger the defense mechanism of memory.
Explanation:
I hope it has served you, in simple words, all the immune responses we have, both innate and acquired, operate together simultaneously to avoid pathologies, both have the same importance in the role of defense, and within the acquired we have to the defense of the first line, which are the cells that first connect to the affected area, the antigen presenters and those of the second line, which are the ones that form the antibodies.
And finally these redacted ones would fulfill the cellular immunological response part, where these cells are guided by chemical signals that would be the humoral immunological response.
The graphs below show the changes in crab color at one beach.
Which statement best explains the change in the number of light tan and dark tan crabs from 1950 to 1990?
a
Both light tan and dark tan body color provided an advantage to the crabs, regardless of their environment or habitat.
b
Either light tan or dark tan body color, but not both colors, provided an advantage to the crabs, regardless of their environment or habitat.
c
Both light tan and dark tan body color provided an advantage to the crabs on this beach, but not necessarily in other crab habitats.
d
Light tan body color provided an advantage over dark tan body color on this beach, but not necessarily in other crab habitats.
Answer:
C. Both light tan and dark tan body color provided an advantage to the crabs on this beach, but not necessarily in other crab habitats.
Explanation:
The changes in the number of light tan and dark tan body color of crabs that occured can be described as a diversifying or disruptive selection.
This disruptive selection occurs when individuals with extreme traits on both ends of the spectrum become selected against individuals of ntermediate or medium traits.
In the case of the crab, their environment favors the selection of both extreme values as against those intermediate individuals, as both light tan and dark tan body color of the crabs gives them advantage over others in this particular environment. This may only be obtainable in this environment or similar beach environment with the same settings and conditions.
What processes found at a convergent boundary will help form the following rock? Sedimentary Rocks:
Answer:
At many convergent boundaries a subduction zone is formed which drives crust down toward the mantle where the rock is melted and turned to igneous rock.
Explanation:
Where an oceanic crust meets a continental crust at a convergent boundary the oceanic crust is subducted under the continental crust. As the oceanic crust is driven down the friction, pressure and heat of the mantle melts the oceanic crust. The melted crust become igneous rock and often comes to surface in volcanos found near the convergent boundary.
The melted crust that doesn't reach the surface becomes igneous granite while the melted crust that does reach the surface becomes lava.
The question unanswered is how thick layers of oceanic crust ends up on the continents when what is observed today is the destruction of oceanic crust at subduction zones, due to convergent boundaries.
Everyone's skin contains about the same number of melanocytes even though people come in many different colors. How is this possible?
Question 2: How and why did changes in the environmental conditions affect carrying capacity in this
scenario? Recall the scenarios: 0-15 years, Harsh winter, 15-30 years, Harsh winter and Cold spring; 30
45 years, Harsh winter, Cold spring, and Hot summer.
Answer:
Changes occurs in the environmental conditions directly affect carrying capacity of the ecosystem.
Explanation:
Carrying capacity of the ecosystem refers to the capacity of the environment which adjust plants and animals in a specific atmospheric condition. Suppose in harsh winter, the temperature of the ecosystem is very low which is unbearable for most of the plant and animal species, so very low number of plants and animals are able to live in that environment. In the ecosystem where the winter is harsh and the spring is cold, the population of living organism are more decreasing. If the ecosystem has Harsh winter, Cold spring, and Hot summer, this type of environment hold very low number of living species due to high variation in the environment.
Answer:
During the first 0-15 years there was hardly no environmental factors that affected the population growth. Since the population growth, and the food growth was still alive, the carrying capacity still remained strong at around 300 rabbits by the 15th year. Then during the 15-30 years with the harsh winters and cold springs, the rabbit population started to decrease as the rabbits weren’t surviving as well as they used to, lowering the capacity. The food source was also limited, causing even more of a lower carrying capacity at around 200 rabbits around the 30th year. Finally during the 30-45 year mark with the cold winters and springs, and during the hot summers, the rabbit population went down even more. The capacity went down because the food was so limited that there was not enough food for the population, eventually leading the rabbit population down at 100 rabbits during the final 45th year.
Explanation:
Which of the following is a likely geographic barrier for speciation of finches?
a open field of grass
b mountain range or a canyon
c islands surrounded by ocean water
d forrest of trees
the Geographic barrier for speciation of finches are---
b. mountain range or a canyon
1) Examine the diagrams below.
2) Describe and explain the changes in the groups of species 2 through 6 in the “Over Time in Six Stages” graph (the top one). Use scientific reasoning to support your explanation.
Answer/Explanation:
The diagram below shows the various stages of ecological succession that occurs over time and how an ecosystem forms from bare surfaces like an area of land covered by lava as a result of volcanic eruption.
The changes in the group of species that occur overtime is depicted in the "six stages" graph which can be described as follows:
1. The first line in the graph shows bare rock which initially supports no life forms.
2. The second stage is dominated initially by pioneer species such as mosses, lichen, which usually produce many small spores and seeds that are dispersed over large area of land. They colonize the bare rocks and their activities help in the breaking down of the rocks to form soil. They also help in the formation of organic matter, and with time, enable the growth of herbaceous plants such as grasses and ferns.
3. At stage 3, herbeceous plants like grasses and herbs that are usually annual plants, gradually replace the mosses and lichen, followed by perrenial herbaceous plants. Further build up of organic manure occurs, thereby encouraging more species of organism to dominate the land
4. At stage 4, woody pioneers that are more later than grasses begin to form and dominate the area with time as more group of species are added.
5. At stage 5, Fast growing trees that are shade intolerant begin to emerge and populate the area, in the presence of herbs and other vascular plant species.
6. At stage 6, a climax community is formed as shade tolerant trees emerge.
What percentage of alleles are
homozygous recessive?
50%
25%
How are genotypes for recessive traits written? (Capital letters or lowercase letters). Select the
correct answer.
Answer:
genotype = the genes of an organism; for one specific trait we use two letters to represent the genotype. A capital letter represents the dominant form of a gene (allele), and a lowercase letter is the abbreviation for the recessive form of the gene (allele).
Explanation:
L Pretest: Unit 5
Gas exchange takes place across the membranes of the alveoli and the
capillaries. How do the structures of these membranes improve the efficiency
of this process?
AIK
Bronchiole,
Alveo
Small blood
vessels (capillaris)
A. Pores in the membranes allow oxygen to move out of the alveoli's
cells and carbon dioxide to move into the cells.
O B. The shapes of the membranes slow blood flow, allowing more
time for gas exchange
O C. The shapes of the alveoli and the capillaries increase the surface
area of the membranes.
O D. The membranes have proteins that transport carbon dioxide and
oxygen against the concentration gradients.
Answer: O C. The shapes of the alveoli and the capillaries increase the surface area of the membranes.
Explanation:
Alveoli are tiny air sacs in the lungs, which takes the oxygen inside them. The membranes of the alveoli and the capillaries expand to take up the oxygen whereas the contract or becomes narrower when they expel out the carbon dioxide gas. Thus the shapes of the membranes of the alveoli and capillaries play an important role during exchange of gases.
PLEASE HELP I WILL MARK AS BRAINLIST !!!!!!!
FW.02]Which of these best matches surface features with the processes that are responsible for their formation?
O sinkholes, caves, and hills heating of ground water due to geothermal energy
Ogeysers, hills, sinkholes groundwater erosion leading to deposition of minerals
O sinkholes, caves, and hot springs chemical and physical actions of groundwater
geysers, sinkholes, and hot springs dripping of groundwater from the ceiling of an underground cave
Answer:
O sinkholes, caves, and hills heating of ground water due to geothermal energy
Explanation: