Antigen-presenting cells usually display processed antigens to T cells in the LYMPH NODES. These nodes are regions of the body where lymphocytes are activated.
T cells are white blood cells (lymphocytes), which form part of the immune system.
These cells (T cells) develop in the bone marrow.
The lymph nodes are secondary lymphoid organs in which naive T cells that search for specific antigens examine antigen-presenting cells (APCs) for their activation.
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To be determined
Which of the following are parts of the cell theory?
a All cells come from other cells.
b All organisms are composed of cells.
С
Cells are alive and the basic units of organization in
all organisms.
d All of these are parts of the cell theory,
Answer:
D is the answer All of those are parts of the cell theory!
In living organisms the cell
cycle is closely regulated.
What do you think will
happen if cell division is not
controlled?
Answer:
Explanation:
Disruption of normal regulation of the cell cycle can lead to diseases such as cancer. When the cell cycle proceeds without control, cells can divide without order and accumulate genetic errors that can lead to a cancerous tumor
The cell life cycle is controlled meaning that:
The reproduction of the cell is controlled.
The cell has a "programated death" meaning that at some point, all normal cells die.
If there is a problem with these (uncontrolled reproduction or cells that just not die) a tumor will appear.
Where the tumor is just a mass of these cells that reproduce uncontrolled and that don't die naturally.
So the thing that happens if cell division is not controlled, is that a tumor will appear.
erythropoietin is a hormone produced by the _______________ to increase the rate of production and maturation of erythrocyte progenitor and erythroblast cells.
Answer: Kidneys
Explanation:
Both the kidneys and the liver produce erythropoietin. If only one answer is allowed, I would choose kidney because it produces nearly 85 percent of it.
Which molecule supplies chlorophyll with electrons
In light reactions, a molecule of chlorophyll absorbs one photon of light, causing a chlorophyll electron to transfer to a higher energy level. The energized electrons from the chlorophyll molecules flow down a transportation chain to a compound called nicotinamide adenine dinucleotide phosphate or NADP.
▪▪▪Cutest Ghost▪▪▪Water is the molecule that supplies chlorophyll with electrons.
What happens during photosynthesis?Photosynthesis is the process by which plants, algae, and some bacteria convert light energy into chemical energy in the form of glucose (sugar) and other carbohydrates. This process also produces oxygen as a byproduct.
During the process of photosynthesis, chlorophyll absorbs light energy, which is used to split water molecules into oxygen and hydrogen atoms. The hydrogen atoms are then used to generate ATP and NADPH, which are used to power the process of carbon fixation. The oxygen atoms are released as a byproduct of water splitting and become a part of the oxygen in the Earth's atmosphere.
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How did the floating rubber ducks get from the coast of Japan all the way across the Pacific Ocean to Canada and Alaska?
Answer:
id say the tides, but i dont know your answer choices. If you post them i could help more.
Explanation:
name the organelles that perform each of the following functions
Answer:
Please give more context.
Explanation:
Can someone please help me and not just answer for points
Answer:
option c is the answer met-his-stop
The weather forecaster predicts a high temperature today of 86 °F. What will the temperature be in Celsius?
SELECT AN ANSWER
A- 97.2 ˚C
B- 359 ˚C
C- 30 ˚C
D- 65.6 ˚C
Which of the following is not true during crossing over?
What molecule, located in the nucleus, is composed of two strands forming a double helix, and what is its function?
O It is a protein, and it catalyzes cellular reactions.
O It is a carbohydrate, and it is a source of cellular energy.
O It is DNA, and it stores the genetic information of cells.
It is RNA, and it is directly involved in the synthesis of proteins.
on
There are 18 daisies in a 0.25 m² area. How many daisies might there be in a 1.0 m² area?
Answer:
72
Explanation:
0.25 X4 =1.0 so
18x4=72
what are the similarities of plant kingdom and animal kingdom
HELPPPP!!!
Describe an example of how island biogeography principles were used to explain biodiversity changes in areas that were not specifically islands.
Answer:
How Biogeography Affects Biodiversity
Alfred Russel Wallace, Father of Biogeography
Figure 1: Alfred Russel Wallace, Father of Biogeography
Some places contain more species than others. For example, Antarctica has fewer species than a temperate deciduous forest, which in turn has fewer species a tropical rainforest. For over 150 years, researchers have sought to make sense of the gross and fine scale spatial patterns in biodiversity, and to elucidate both the proximate and ultimate causes for these patterns.
This article describes some of the major geographic patterns in species richness, and the processes and theories that are thought to account for these patterns. Much of this knowledge has emerged from the tremendous body of work from one scientist, Alfred Russel Wallace (Figure 1), widely regarded as the “Father of Biogeography.” Aside from co-originating the process of Natural Selection with Charles Darwin, Wallace spent extended periods studying the distribution and diversity of plants and animals in Amazonia and Southeast Asia in the mid 1800s. Many of the patterns and processes featured in this article were initially described by Wallace, and careful study of his work indicates that his ideas presaged many of the discoveries made by his numerous successors.
Many of the spatial patterns in biodiversity are overt, others are subtle and yet additional patterns remain undetected. While the existence of these patterns may be obvious — and changes in the environment that are paired with these patterns may also be obvious — the mechanisms that cause the differences in biodiversity along environmental gradients are under still the subject of scientific debate. Because large-scale patterns are the emergent result of complex interactions at many spatial and temporal scales, no single answer is likely to ever emerge, but with continued research our understanding of the processes shaping these patterns increases.
Historical Processes Affecting Biogeography
Darwin's finches of the Galapagos Islands are a classic example of adaptive radiation.
Figure 2: Darwin's finches of the Galapagos Islands are a classic example of adaptive radiation.
All species occurring in at a given place and time either arrived from another place or originated in that location from ancestral species. This fact applies to extinct species that were ancestors of all extant species. Species richness in a given location is the result of three factors — the rate of speciation, the rate of extinction, and the dispersal of species from other locations. In principle, if biogeographers could understand how the current and past environment has shaped these three factors, we would then obtain a comprehensive understanding of what generates all biogeographic patterns of species richness. However, numerous environmental and organismal parameters can drive these historical factors, in both complex and interacting fashions.
help with biology please!
how to read a phylogenetic tree ? ( easy and detailed pls)
Answer:
understanding phylogeny. understanding a phylogeny is a lot like reading a family tree. the root of the tree represents the ancestral lineage and the tips of the branches represent the descendants of that ancestor. as you move from the route to the tips you are moving forward in time
Explanation:
blahblah
A block of wood has a mass of 120 g
and a volume of 200 cm3. What is the density of
the wood?
Answer:
0.6 cm3
Explanation:
D=mass/volume
D=120g/200 cm3
D=0.6 cm3
When methane (CH4) combines with oxygen (O2), carbon
dioxide (CO2) and water vapor (H20) are produced.
Which equation represents this chemical reaction?
O A. CO2 + CH4 + 2H20 + 202
OB. CO2 + 2H20 – 202 + CH4
OC. CH4 + 202 – CO2 + 2H20
OD. CH4 + 2H20 - 202 + CO2
Answer:
C. CH4 + 202 – CO2 + 2H20
Explanation:
CH4+O2-CO2+H20
The above equation represents combustion of methane to produce carbon-dioxide and water.
One carbon atom is present on the reactant side as well as on the product side. Four hydrogen atoms are present on the reactant side and two hydrogen atoms on product side. In order to balance this equation, we would multiply water molecule by two. Now there are four atoms of oxygen in the product side but only two on reactant side, so we will multiply oxygen molecule by two on the reactant side. Now the equation is balanced.
The balanced chemical equation is:
CH4+202-CO2+2H2O
This equation obeys the law of conservation of mass as the mass of the reactants is same as that of the products.
Answer:
C. CH4 + 202 – CO2 + 2H20
Explanation:
I need help
please ASAP
Annuals, Biennials, Perennials
Life Span
Annuals
Biennials
Perennials
Description
Insert Voiceover
of you
ring this
and place it
Answer: Insert Voiceover
Maya Is a carrier for albinism, a recessive tralt that results in the absence of the skin plgment melanin In halr and
eyes. She marries Jack, and they have four children: Zach, Olivia, Sophla, and Veronica. Veronica expresses the
tralt for albinism, but her three siblings are unaffected by the recessive tralt.
Draw a pedigree that Illustrates the famlly's tralts, and upload your pedigree.
Answer:
hereditary
Explanation:
if Maya tralt if albinism is recessive, then definitely the tralt for Jack is dominant
Metamorphic rocks are common when two continental plates collide because There is a lot of stress when enormous slabs of crust push together Sediment buries rocks to increase pressure O Magma bodies are common because there is a lot of melting O All of these
Answer: Metamorphic rock, estimated to be as old as 3.8 billion years, located near Isua at Qorqut Sound, Greenland.In the rock cycle, there are three different types of rocks: sedimentary, igneous, and metamorphic. Sedimentary and igneous rocks began as something other than rock. Sedimentary rocks were originally sediments, which were compacted under high pressure. Igneous rocks formed when liquid magma or lava—magma that has emerged onto the surface of the Earth—cooled and hardened. A metamorphic rock, on the other hand, began as a rock—either a sedimentary, igneous, or even a different sort of metamorphic rock. Then, due to various conditions within the Earth, the existing rock was changed into a new kind of metamorphic rock.
The conditions required to form a metamorphic rock are very specific. The existing rock must be exposed to high heat, high pressure, or to a hot, mineral-rich fluid. Usually, all three of these circumstances are met. These conditions are most often found either deep in Earth’s crust or at plate boundaries where tectonic plates collide. In order to create metamorphic rock, it is vital that the existing rock remain solid and not melt. If there is too much heat or pressure, the rock will melt and become magma. This will result in the formation of an igneous rock, not a metamorphic rock.
Explanation:
What is the difference between "growth and development" and "evolution"
Answer:
What's the difference between growth and development and evolution?
is that growth is an increase in size, number, value, or strength while evolution is (general) gradual directional change especially one leading to a more advanced or complex form; growth; development.
Explanation:
Hope this helps.
what are the two characteristics of the maturity principle?
Answer:
The Maturity Principles: People tend to become more agreeable, emotionally stable, and socially dominant as they grow older. The Plasticity principle: While personality traits tend to be stable, they are not set in stone.
Explanation:
Explain your observations. What did you observe? Submit your data chart here.
In multicellular organisms, cells working together and performing similar functions are called...
Question 9 options:
organ systems.
organisms
tissues
organs
Answer:
tissues
Explanation:
someone help me with this !!!!
Answer:
For structural support: Nucleic acid.
For energy storage: Lipids or Carbohydrates. ( I'm kinda confused with this one since both do the job )
For membrane and barrier formation: Lipids or Carbohydrates. ( I'm kinda confused with this one since both do the job )
For Catalyst and biological formation: Protine
For Genetic information storage: Nucleic acid.
For Chemical signaling: Lipid.
Question 4 of 25
How are photosynthesis and cellular respiration related?
A. Cellular respiration is the process animals use to produce glucose, while photosynthesis is the process plants use to produce glucose
B. The products of photosynthesis are the reactants of cellular respiration
C. Photosynthesis produces water molecules, while cellular respiration splits water molecules apart.
D. Cellular respiration provides the energy for photosynthesis.
Answer:
B. The products of photosynthesis are the reactants of cellular respiration.
Answer: I think its B.
prokaryotic cells are smaller than eukaryotic cells. what is a plausible explanation?
Answer:
prokaryotic cells are smaller than eukaryotic cells because they have fewer organelles.
Explanation:
prokaryotic cells do not contain a nucleus, vacuoles, endoplasmic reticulum, mitochondria, Golgi apparatus, lysosomes, or peroxisomes, thus making them smaller than eukaryotic cells.
In bakery when _______ is added to the dough for preparing bread, the dough rises f
Answer:
it is Yeast, yeast makes it rise
What bird is known in North America that makes domes shaped nests and lives in the western part of it?
Answer: Cowbirds lay eggs in a great variety of nests, including Red-winged Blackbird nests in marshes, dome-shaped Ovenbird nests on the forest floor, cup nests in shrubs and treetops, and even occasionally in nests in tree cavities.