Cytotoxic T cells kill their targets by programming them to undergo apoptosis. When cytotoxic T cells are mixed with target cells and rapidly brought into contact by centrifugation, they can program antigen-specific target cells to die within 5 minutes, although death may take hours to become fully evident.
How do T lymphocytes destroy infected cells?In cellular immunity, a killer T cell identifies and kills a virus-infected cell because of the viral antigen on its surface, thus aborting the infection because a virus will not grow within a dead cell.
Thus, Cytotoxic T cells kill their targets by programming them to undergo apoptosis.
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Which statement best describes cancer cells?
• They grow as a single layer of cells.
• They cease to reproduce after 20-50 mitotic divisions.
• They reproduce only when needed to replace missing cells.
• They are not regulated by contact inhibition.
Answer:
They are not regulated by contact inhibition.
Explanation:
The lack of contact inhibition control in cancer cells is what allows them to continue to reproduce. In non-cancerous cells, contact inhibition triggers cells to stop dividing and to grow when they come in contact with other cells. This control is lost when cells undergo malignant transformation.
How many times larger is the radius of the Sun than that of the Earth?
A. 7
B. 65
C. 150
D. 109
109
Explanation:
The suns radius is 432,690 mi the earth's radius is 3,958.8 mi
Answer:
Option D: 109
plss help!!
In your own words, explain the goals of taxonomy. What scientific evidence is used to group organisms?
Answer:
explain the goals of taxonomy?
The main aim of taxonomy is to identify, characterise, classify and give specific names to all the living organisms according to their characteristics. Plants and animals are classified into different taxa, e.g. kingdom, phylum, class, order, family, genus and species.
What scientific evidence is used to group organisms?
Scientists use pieces of evidence such as the organism's morphological structure and evolutionary descent. The gathered evidence is illustrated using either a cladogram or a dichotomous key in order to classify and to identify the organisms.
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10.
Which of these body systems is involved in coordinating and controlling body movements and responses?
endocrine
nervous
In 2008, Americans generated 250 million tons of non-hazardous municipal solid waste. Of that waste,
54.2 percent was discarded
33.2 percent was recovered
12.6 percent was burned with energy recovery at
590 kWh of electricity per ton
I
Fill in the table to answer the following:
How many tons were discarded, and what is the method by which solid waste is discarded?
How many tons were recovered, and what are the methods of recovery?
How many tons were burned, what was the method for producing electricity, and how much electricity
was generated?
Discuss the positive and negative environmental impacts of eliminating one of the three endpoints.
The endpoint of municipal solid
Tons (millions)
Method
waste
discarded
recovered
burned with energy recovered
Answer:
Explanation:
How many tons were discarded, and what is the method by which solid waste is discarded? 54.2% of 250 million can be calculated by multiplying 250 million by 0.542, which equals 135.5 million tons of waste discarded.
How many tons were recovered, and what are the methods of recovery? 83 million tons recovered (250 million * 0.332)
How many tons were burned, what was the method for producing electricity, 31.5 million tons burned (250 million * 0.126)
and how much electricity was generated? 1.8585 X 10^10 kWh or 18.86 billion kWh of electricity generated (31.5 million tons burned * 590 kWh per ton)
why are scientists unsatisfied with using one type of element to determine the age of a rock?
Answer:
Different elements have different half lives, which means that certain elements are only useful for determining the age of a rock up to a certain age. Carbon-14, for example, is great for dating archeological finds as old as 50,000 years. But that's the limit of its usefulness. I would not be useful for dating dinosaur bones. For that you would need an element with a much longer half life, such as Uranium-238, which has a half life of more than a million years.
What molecule do red blood cells more readily bind with if they are given a choice between it and O2?
Answer:
Hemoglobin is a protein found in red blood cells that is comprised of two alpha and two beta subunits that surround an iron-containing heme group. Oxygen readily binds this heme group.
What term is used to describe how well an organism functions in its
environment?
о
A. Variation
о O B. Selection
O C. Fitness
O D. Evolution
Answer:
C. Fitness
Explanation:
Fitness is the term used to describe how well an organism functions in its environment. The phrase "survival of the fittest" refers to the fitness that an organism has with regard to its environment. The greatrer an organism's fitness, the greater its chances of survival, and the greater its chances of reproducing.
The digestive system relies on the
system to deliver the nutrients to the entire
body of the organism.
Answer:
The digestive system relies on the circulatory system to deliver the nutrients to the entire body of the organism.
Explanation:
» Concepts
The function of the digestive system is to break down food into nutrients for your body to use as energy. However, once the food is broken down, the nutrients pass onto the bloodstream. Then, the circulatory system takes action and transports them throughout your body.
What are Micro-Organisms
Answer:
A microorganism, or microbe,[a] is an organism of microscopic size, which may exist in its single-celled form or as a colony of cells.
Answer:
Those organism which cannot be seen under eyes and require microscope to be seen are called micro organism .
Plants produce hormones to help them regulate important processes, such as growth and response to the environment. Hormones produced in one part of the plant may affect cells in a different part of the plant. What type of tissue carries hormones through the body of a plant?
Vascular tissue
Reproductive tissue
Dermal tissue
Ground tissue
Answer:
vascular tissues
hope it helps :)
Answer:
vascular tissue
Explanation:
In plants, hormones travel large throughout the body via the vascular tissue (xylem and phloem) and cell-to-cell via plasmodesmata.
b. Layers of rock are moved by forces beneath Earth's surface.
c. Most geological processes operate extremely slowly.
d. The processes that changed Earth in the past are different from the processes that
operate in the present.
3. Circle the letter of each sentence that is true about Lyell's work.
a. His book, Principles of Geology, was published after Darwin returped from his voyage.
b. His work explained how awesome geological features could be built up or torn down
over long periods of time.
Answer:hey reasoned that all rocks that were laid down in layers in large part were laid down under or by water or action by a fluid. They later discovered that both water and wind laid down the materials that later became lithified to become rocks.When these rocks were deposited as sediments, this area was most likely (1) under the ocean (2) a desert between high mountains (3) repeatedly covered by lava flows (4) glaciated several times Both organisms that formed the fossils found in rock layers 3 and 4 (1) lived during the same period of geologic time (2) lived in polar regions
List the top four basic needs that you think must be met during a prolonged emergency
when normal activities are severely affected?
The four basic neccessities in emergency period are;
FoodWaterShealterClothingWhat is an emergency?The term emergency refers to any period in which there is scarcity of basic resources such as during war.
In such times there are four basic neccessities that one must think about and they are;
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what depolarizes producing the P wave, which generates a wave of contraction
Answer: The P wave indicates atrial depolarization. The P wave occurs when the sinus node, also known as the sinoatrial node, creates an action potential that depolarizes the atria. The P wave should be upright in lead II if the action potential is originating from the SA node.
Explanation:
How does cytolysis occur via the complement pathway?.
Answer:
The complement proteins C3a and C5a lead to the release of histamines, resulting in inflammation and chemotaxis. How does cytolysis occur via the complement pathway? Disrupting cell wall of pathogens Stimulation of the inflammatory response Triggering the release of histamine Formation of the MAC in invading cells, killing them
Explanation:
what is an animal cell??
The fact that all organisms have DNA as their genetic material is evidence that
-Natural Selection Occurred
-All organisms descended from a common ancestor
-Selective breeding takes place everyday
-Genetic resistance rarely occurs
As opposed to freshwater animals, salt water animals have a risk of this reaction due to the salt concentration in the water.
A) Overflow of oxygen
B) Shrinking
C) Losing carbon dioxide
D) Swelling
As opposed to freshwater animals, salt water animals have a risk of shrinking due to the salt concentration in the water. So, the correct option is (B).
What is Osmosis?Osmosis is defined as the diffusion of water molecules across a selectively permeable membrane from an area of high concentration to an area of low concentration.
When cells of saltwater animals encounter a hypertonic solution, that is, a high concentration of solutes, they dehydrate due to lack of water, so they shrink, and when those cells lose solutes with respect to their insides When exposed to low concentrations, they absorb water, so they swell.
So if a saltwater animal is exposed to a high concentration of solute, its cells will shrink or experience plasmolysis,
Thus, as opposed to freshwater animals, salt water animals have a risk of shrinking due to the salt concentration in the water. So, the correct option is (B).
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An inheritable physical feature is a
Answer:
Physical trait.
Explanation:
Characteristics that are obserevable that a child inherits from there parents.
Ex: Freckles
the question is in the picture
i'll brainliest immediately who can answer it properly
you may take your time. thank you.
Answer:
The importance of plant genetic diversity (PGD) is now being recognized as a specific area since exploding population with urbanization and decreasing cultivable lands are the critical factors contributing to food insecurity in developing world. Agricultural scientists realized that PGD can be captured and stored in the form of plant genetic resources (PGR) such as gene bank, DNA library, and so forth, in the biorepository which preserve genetic material for long period. However, conserved PGR must be utilized for crop improvement in order to meet future global challenges in relation to food and nutritional security. This paper comprehensively reviews four important areas; (i) the significance of plant genetic diversity (PGD) and PGR especially on agriculturally important crops (mostly field crops); (ii) risk associated with narrowing the genetic base of current commercial cultivars and climate change; (iii) analysis of existing PGD analytical methods in pregenomic and genomic era; and (iv) modern tools available for PGD analysis in postgenomic era. This discussion benefits the plant scientist community in order to use the new methods and technology for better and rapid assessment, for utilization of germplasm from gene banks to their applied breeding programs. With the advent of new biotechnological techniques, this process of genetic manipulation is now being accelerated and carried out with more precision (neglecting environmental effects) and fast-track manner than the classical breeding techniques. It is also to note that gene banks look into several issues in order to improve levels of germplasm distribution and its utilization, duplication of plant identity, and access to database, for prebreeding activities. Since plant breeding research and cultivar development are integral components of improving food production, therefore, availability of and access to diverse genetic sources will ensure that the global food production network becomes more sustainable. The pros and cons of the basic and advanced statistical tools available for measuring genetic diversity are briefly discussed and their source links (mostly) were provided to get easy access; thus, it improves the understanding of tools and its practical applicability to the researchers.
which statement best describes a relationship between mitochondria and chloroplasts
List the ways eukaryotic cells can modify the original mrna transcript.
Answer:
The pre-mRNA has to go through some modifications to become a mature mRNA molecule that can leave the nucleus and be translated.
Explanation:
Eukaryotic pre-mRNAs are modified with a 5' methylguanosine cap and a poly-A tail. These structures protect the mature mRNA from degradation and help export it from the nucleus. These include splicing, capping, and addition of a poly-A tail, all of which can potentially be regulated – sped up, slowed down, or altered to result in a different product.
I hope this helps. :).
If water is moving from inside of a red blood cell to outside of the cell into the blood plasma, the solution is
a. hypotonic
b. hypertonic
c. isotonic
d. monotonic
Answer:
hypertonic
Explanation:
If a cell is placed in a hypertonic solution, there will be a net flow of water out of the cell, and the cell will lose volume. A solution will be hypertonic to a cell if its solute concentration is higher than that inside the cell, and the solutes cannot cross the membrane.
______occurs so plants can make _________to use for energy
Answer:
PhotosynthesisGlucoseeasy biology question below first correct answer gets brainliest
Answer:
the answer is sequestered
Geologic carbon sequestration is the process of storing carbon dioxide (CO2) in underground geologic formations. The CO2 is usually pressurized until it becomes a liquid, and then it is injected into porous rock formations in geologic basins
Interpret the range of annual precipitation and the temperature range for a tundra biome.
is salmon and shark have the same gas exchange?
Answer:
yes
Explanation:
because oxygen and carbon dioxide is formed into water by the gills
Protein X activates gene expression only in cells exposed to a specific signaling molecule. In a study,
researchers determined the intracellular location of Protein X in cultured cells both before and after exposing
the cells to the signaling molecule. The results of the study are shown in the diagram.
Based on the results, which of the following best describes what Protein X is?
A. Protein X is an RNA splicing enzyme.
B. Protein X is a cell membrane receptor protein.
C. Protein X is a transcription factor.
D Protein X is a hormone.
Before
Treatment
After
Treatment
Protein X
-z
Based on the results, which of the following best describes what Protein X is a transcription factor.
What are transcription factors?Transcription factors are proteins that contain at least two functional domains: one binding with DNA and the other binding with RNA polymerase. These proteins control when, where and how the genes will be transcribed, being the basis for the control of gene expression.
In this case the protein X is a transcription factor which means proteins that help turn specific genes "on" or "off" by connecting to nearby DNA. Transcription factors that are activators drive the transcription of a gene.
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PLEASE HELP
Which of these is a major cause affecting vertical movement of global deep ocean currants
A flow into the ocean
B Tidal ebb and flow
C The rise and fall of the ocean floor topography
D Movements of major animal populations
Answer: B.
Explanation:
Winds, water density, and tides all drive ocean currents. Coastal and sea floor features influence their location, direction, and speed. Earth's rotation results in the Coriolis effect which also influences ocean currents.
What is one way that tourists damage coral reefs?
They practice dynamite fishing.
They use cyanide in their fishing practices.
They touch the coral or take pieces of it.
They add fertilizer to the water.
