Iris is the structure that regulates the amount of light entering the posterior segment of the eye.
The colored disc-shaped membrane found in the eye of humans and various animals is called the iris.
The pupil appears in the center of the iris: an opening that allows light to enter.It is located behind the cornea, constituting a separation between the posterior chamber and the anterior chamber of the eye.It helps to dilate or contract the pupil to allow more or less light to enter the eye.Therefore, we can conclude that iris is the structure that regulates the amount of light entering the posterior segment of the eye.
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which nervous system transmits only excitatory signals to effector cells?
Answer:
Explanation:
Sensory afferent neurons convey information from tissues and organs into the central nervous system. Efferent neurons transmit signals from the central nervous system to the effector cells and are sometimes called motor neurons. Interneurons connect neurons within specific regions of the central nervous system.
Highly morphologically varied groups of closely related species (meaning that they share a recent common ancestor) likely arose as a result of______________________ evolution.
A solution consists of 24 g of table salt
dissolved in 2 L of water. Express the
concentration of salt in the form of a ratio
Answer:
24 g of salt: 2 L of water
or
12 g of salt: 1 L of water
A population of 1,000 birds exists on a small Pacific island. Some of the birds are yellow, a characteristic determined by a recessive allele. The others are green, a characteristic determined by a dominant allele. A hurricane on the island kills most of the birds from this population. By chance, only ten birds remain, and those birds all have yellow feathers.
Below are several statements about this hypothetical situation.
a. Assuming that no new birds come to the island and no mutations occur, future generations of this population will contain both green and yellow birds.
b. Assuming that no new birds come to the island and no mutations occur, future generations of this population will contain only yellow birds.
c. This situation represents diversifying selection.
d. This situation represents directional selection.
Answer:
b. Assuming that no new birds come to the island and no mutations occur, future generations of this population will contain only yellow birds. Explanation:
A charged tRNA with the ____________ that is complementary to the codon in the A site enters and binds to the A site.
Answer: Anticodon
A charged tRNA with the Anticodon that is complementary to the codon in the A site enters and binds to the A site.
help me plz..............................................
Answer:
lose Answer
Please mark as brain list
a strand of dna that will pair with AATTCGTAATTGGCTAG
Answer:
lol what?
Explanation:
A base pair is two chemical bases bonded to one another forming a "rung of the DNA ladder." The DNA molecule consists of two strands that wind around each other like a twisted ladder. Each strand has a backbone made of alternating sugar (deoxyribose) and phosphate groups. Attached to each sugar is one of four bases--adenine (A), cytosine (C), guanine (G), or thymine (T). The two strands are held together by hydrogen bonds between the bases, with adenine forming a base pair with thymine, and cytosine forming a base pair with guanine.
Answer:
TTAAGCATTAACCGATC
Explanation:
Thymine (T) pairs with Adenine (A)
Cytosine (C) pairs with Guanine (G)
a. According to Model 3, which of the following diagrams correctly show an original set of
homologous chromosomes (grey) and their sister chromatids (black)—the replicated portion?
ХХ ХХ ХХ ХХ
XX
The diagrams to answer the question are missing. However, an original set of homologous chromosomes and their sister chromatids should look like a column of one color for the homologous and another column of the same color but join with the original column by the centromere for the sister chromatid.
A chromosome is a molecule of DNA; it stores and transmits genetic information. Chromosomes have different parts and structures.
A homologous chromosome is:
A pair of DNA molecules that have two different genetic information.Each chromosome comes from one progenitor. It has its respective genetic information.A sister chromatid is:
The replication of the homologous chromosome. They carry the same information.
In conclusion, an original set of homologous chromosomes and their sister chromatids will look like the one shown in the image. Two lines of a different color for the homologous chromosome and "X" of the same color for the sister chromatid, since it is a chromosome that it replicated itself and is joined to the original one by the centromere.
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What does Homologous mean?
having the same relative position, value, or structure
The left side of the heart pumps oxygen-rich blood throughout the body in a process called ______ circulation.
Systemic circulation is a process through which oxygenated blood is pumped throughout the body of a living organism by the left-side of a mammalian heart.
Cardiac cycle can be defined as a complete heartbeat of the mammalian heart, which typically comprises sequential alternating contraction and relaxation of both the atria and ventricles, therefore causing oxygen-rich blood to flow unidirectionally (in one direction) throughout the human body.
Systemic circulation is a process that is responsible for the transportation of oxygen-rich blood from the left-side of the mammalian heart throughout the body of a living organism.
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What are some of the economic benefits versus the ecological impact of the agriculture industry in California?
Answer:
Economic impacts associated with agriculture in the United States appear to be positive overall, with estimates ranging from an annual loss of $0.25 billion to a gain of about $5 billion, depending on the climate scenario used, with consumers generally gaining from the increased productivity and producers generally
Explanation:
3. Mitochondria isolated from liver cells can be used to study the rate of electron transport in response to a variety of chemicals. The rate of electron transport is measured as the rate of disappearance of O2 from the solution using an oxygen-sensitive electrode. How can we justify using the disappearance of oxygen from the solution as a measure of electron transport?
We can justify using the disappearance of oxygen from the solution as a measure of electron transport due to the fact that oxygen is consumed during the process and is essential.
The electron transport chain is a complicated series of processes that take place within the mitochondria of a cell. This chain assists in the production of ATP which drives most of the functions of cells. The electron transport chain consists of various redox reactions between electron donors and receivers.
The role of oxygen in the electron transport chain is to act as the final receiver of electrons. Therefore, not only is oxygen consumed during this process, but it is also among the last steps, which allows us not only to measure that the electron transport chain had commenced, but also that it has proceeded correctly. We can do this based on the rate of disappearance of oxygen.
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what phrase is used to describe the structure of dna
Answer:
genome
Explanation:
The term "double helix" is used to describe the shape of DNA. This term is used to characterise the lengthy, double-stranded molecule of DNA's three-dimensional structure.
Two strands of nucleotides that are twisted around one another, resembling a spiral staircase, make up the double helix structure of DNA. The complementary base pairs of the nucleotides form hydrogen bonds that hold the two strands of DNA together.
Adenine (A) and thymine (T) and guanine (G) and cytosine (C) are the base pairs in question. During DNA replication and transcription, the strands may readily split and reunite thanks to the double helix shape of DNA. Additionally, the double helix shape permits the storing of genetic data in a small space.
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The spleena. filters damaged red blood cells from the blood.b. changes undifferentiated lymphocytes into competent lymphocytes.c. is necessary for life. It can't be removed without causing death.d. produces several different hormones with unknown function.e. has additional digestive functions.
Answer:
filters damaged red blood cells from the blood.
Explanation:
Body temperature is mostly regulated by which of the following systems? Select all
answers that apply.
Select 2 correct answer(s)
skeletal system
circulatory system
integumentary system
reproductive system
prior to the work of mendel, inheritance was viewed as resulting from ______
Prior to the work of Mendel, inheritance was viewed as resulting from the BLENDING of phenotypic traits within fixed, unchanging species. Mendel discovered how traits are inherited across generations.
Mendel was a scientist who experimented on pea hybrids and now he is known as the father of modern genetics.
The Mendel principles include:
The Law of Segregation posits that phenotypic inherited traits can be controlled by two 'factors' (i.e., alleles), which separate (i.e., segregate) and pass into germinal gametic cells.The Law of Independent Assortment posits that these factors do not depend upon each other, but instead, alleles are independently sorted into germinal (gametes) cells.Learn more in:
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What is the difference between osmosis and osmotic pressure?
Answer:
Osmosis is the flow of a solvent into a solution through a semipermeable membrane. Osmotic pressure is the pressure that stops the process of osmosis. Osmotic pressure is a colligative property of a substance since it depends on the concentration of the solute and not its chemical nature.
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Which of the following developmental events is correctly matched with its trimester?
First trimester—tissues and organs form; amniotic sac forms; neurulation occurs
Second trimester—ovarian follicles form; amniotic sac forms; neurulation occurs
First trimester—bone replaces cartilage; eyebrows form; ovarian follicles form
Second trimester—eyebrows form; tissues and organs form; bone replaces cartilage
Given what we know about embryological development, we can confirm that the option that is matched correctly with its trimester is the first trimester—tissues and organs form; amniotic sac forms; neurulation occurs.
The first trimester is one of the busiest for a fetus. During this trimester:
Tissues and Organs form or begin to form Amniotic sac formsNeurulation occursand so much more that is not mentioned in the question.
The formation of the amniotic sac is the earliest of the major events listed. This sac serves as the aquatic medium in which the fetus will find itself during the next 9 months.
Neurulation is the name given to a very complex set of processes that lead to the creation of the neural tube and then the brain. Then, finally, the tissues and organs finish forming into their embryonic stages.
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Answer: First trimester—tissues and organs form; amniotic sac forms; neurulation occurs
Explanation: Just got it right on the test. The answer is A for me. and the person above helped me!! :)
In the ___________, antibiotic paper disks are added to a solid medium inoculated with a standard amount of a pure bacterial culture to test whether the organism is sensitive, intermediate, or resistant to the drug.
Answer:
Kirby-Bauer Test
Explanation:
Explain how plants obtain, transport, and release gases, and water
Answer:
Plants take up the water that they need from the soil through their roots. Carbon dioxide is a gas found in the air; plants can take in this gas through tiny holes in their leaves. Once they have water and carbon dioxide, they can use energy from sunlight to make their food.
Explanation:
Higher organisms use nitrogen to make _____________________. e. Animal wastes decay by the action of bacteria which create __________________and_________________ products rich in nitrogen, and useful for plants to use again.
Answer:
Ammonia and nitrate
Explanation:
what happens if you eat a bunch of vitamin d gummies
Answer:
.... Bro go to hospital. Like right now and make sure you won't overdose.
Explanation:
Don't die.
what gas is released by plants during photosynthesis
Answer:
oxygen po
Explanation:
pa brainliest pls
Examine the layers of rock. Identify and explain which layer contains the oldest fossils
Answer: Layer D has the oldest fossils..
Explanation: The oldest layers are on the bottom, and the youngest layers are on the top. This makes sense because it takes a long time for fossils to form and over time more and more layers would continue to pile up.
Hope this helps :)
Answer:
The answer is layer d
Explanation:
The newest layers would be less sunk in, and the older layers would be sunken
_ _ _ _ _ _ _ser is a consumer that breaks down the remains
of plants and animals
In 3–5 sentences, identify and describe the fossil evidence Wegener used to support the theories of continental drift and plate tectonics. (4 points)
Supporting evidence came from paleontology: the fossils of some dinosaur and other reptile species, such as the freshwater swimming reptile the Mesosaurus, are found on both sides of the southern Atlantic Ocean, but nowhere else in the world. Also if you want there is evidence that climate change was also a part of the continental drift since Antarctica was connected with the rest of the continentes, since Antarctica has ice they melted and slowly moved apart. Behind all of this is plate tectonics since they are underneath all of this which helped move the continents. By convection currents how Heat rising and falling inside the mantle creates convection currents generated by radioactive decay in the core. The convection currents move the plates. Where convection currents diverge near the Earth’s crust, plates move apart. Where convection currents converge, plates move towards each other. But this is mostly with boundaries.
In 3–5 sentences the fossil evidence Wegener used to support the theories of continental drift and plate tectonics is described below
The continental drift hypothesis of whener was based on a number of observations and fossil records is one of them. Wegener found that fossils of a reptile named Mesosaurus can be found in Africa, South America despite vast distance between them by grand ocean of Atlantic.
Similarly fossils of a tree leaves called Glossopteris were found in India, Antarctica, Southern America and Africa. So the evidence suggested that in geological history all these land massed were connected and joined as one landmass.
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During an action potential, voltage-gated potassium channels open after voltage-gated sodium channels. The effect this has on the membrane potential is ______.
The effect that the opening of voltage-gated potassium channels on the membrane potential is it becomes less positive and more negative. These channels allow the entry of potassium (K+) ions into the cell.
At the resting potential, the cell is more negatively charged than the outside the cell.
This negative charge is caused by the accumulation of more sodium (Na+) ions outside the cell than potassium (K+) inside the cell.
When potassium (K+) channels open, the cell becomes more negative because more positive ions leave the cell (hyperpolarized).
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5. As blood glucose levels increase, hormones are
released to return glucose levels to normal. This
is an example of
(1) a nervous system disorder
(2) the synthesis of antibodies
(3) a stimulus and a response
(4) an antigen and antibody reaction
Answer: i think it an antigen and antibody reaction or a stimulus and a response
As blood glucose levels increase, hormones are released to return glucose levels to normal. This is an example of an antigen and antibody reaction.
What is the hormone that causes the blood sugar level to return to normal?When blood sugar levels drop, glucagon instructs the liver to convert the glycogen back to glucose, causing blood sugar levels to return to normal. Insulin also supports healing after an injury by delivering amino acids to the muscles.
What happens when glucose levels return to normal?After people eat, blood sugar concentrations increase. The pancreas releases insulin automatically to move glucose from the blood to the cells. As more and more cells receive glucose, blood sugar levels return to normal. The liver and muscles store excess glucose as glycogen.
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How can scientists determine when these ancient animals lived?
1. normally, sodium and potassium leakage channels differ because ___________________.
Answer:
sodium ions diffuse through leakage channels into the cell, but potassium ions diffuse through leakage channels out of the cell
Explanation:
