Answer:
LD-50: lethal dose 50%, dosage that causes death to 50% of the exposed population
ED-50: effective dose 50%, dosage that causes an effect in 50% of the observed subjects
TD-50: toxic dose 50%, dosage that is toxic to 50% of the observed subjects
These curves do not apply to individuals because it is hard to predict the dosage that will cause a response in an individual, and more practical to predict what percentage of a population will be affected by a certain dosage of a chemical.
Explanation:
Explain how the sugars, phosphates, and nitrogenous bases in one strand of DNA connect to a complementary strand during replication
Answer: One strand of DNA binds to another via base complementarity.
Explanation:
The two strands of the DNA double helix are connected through nucleotides. There are hydrogen bonds between the nitrogenous bases. Each nucleotide has a sugar, nitrogenous base and phosphate group. The phosphate group and sugar forms the backbone of the DNA double helix. The nitrogenous base form pairing with each other via base complementarity. Purines are adenine and guanine and pyrimidine are cytosine and thymine these are nitrogenous bases. The adenine bonded with thymine via two hydrogen bonds and cytosine with guanine with three hydrogen bonds. These nitrogenous bases help in replication process.
The two strands of DNA are actually connected by hydrogen bonds (H-bonds) between the nitrogenous bases.
There are 2 hydrogen bonds between adenine and thymine, and 3 hydrogen bonds between cytosine and guanine.
Why are sugar-phosphate and nitrogenous bases important to DNA molecules?The sugar-phosphate backbone is a significant component of DNA's double helix structure.
The structure of DNA is tied to its function. The pairing of the nitrogenous bases that are connected to the sugar-phosphate backbone play a key role in the ability of DNA to store and transfer genetic information.
Thus, base complementary is the reason.
To learn more about nitrogenous bases click here:
https://brainly.com/question/817276
QOD: have you downloaded Ecosia yet? why not? do it. n o w.
Answer:
What's Ecosia?
Explanation:
An _______ is a beach that prodject like a finger out into the water
During __ tides, the moon is at a right angle to the sun
1.spring
2.Neap
Why coocked food spoil fast but uncocked food spoil slowly
1. An unstable nucleus releases radiation in the form of a helium particle. What process is occurring!
a) Fusion
b) Fission
c) Alpha Decay
d) Beta Decay
An unstable nucleus with too many protons emits energy and an alpha particle during alpha decay. An alpha particle is actually a helium nucleus because it has two protons and two neutrons. A nuclear equation can be used to represent alpha decay. Thus, option C is correct.
What is the alpha decay releases of radiation from helium?When an unstable nucleus changes to another element, a nuclear process called “alpha decay” produces a particle consisting of two protons and two neutrons. The helium nucleus that is being ejected is known as an alpha particle.
An alpha particle is released when a nucleus becomes unstable due to having an excessive number of protons. An alpha particle is a helium nucleus, since it has two protons and two neutrons. This is the alpha decay.
Therefore, Each of the two protons and two neutrons that make up an alpha particle is a helium nucleus that has lost its planetary electrons.
Learn more about Alpha Decay here:
https://brainly.com/question/27870937
#SPJ2
plssss help i will mark brainliest
Answer: 1, 3, 5, and 6
Explanation:
Answer:
DNA and Cytoplasm all cells have both in common
What is the region that is located between Mars and Jupiter and is labeled A
in the illustration?
Solar System
А
O A. The Kuiper belt
OB. The asteroid belt
O C. The terrestrial belt
OD. The comet belt
Answer:
asteroid belt
Explanation:
region between Mars and Jupiter became the asteroid belt. Occasionally people wonder whether the belt was made up of the remains of a destroyed planet, or a world that didn't quite get started. However, according to NASA, the total mass of the belt is less than the moon, far too small to weigh in as a planet.
What is one reason that pumpkins are more closely related to corn plants than to edible mushrooms?
Answer:
they both make their own food (pumpkin and corn)
Explanation:
WILL GIVE BRAINLIEST
Classify each of the following as an example of predation, parasitism, competition, mutualism, or commensalism
1. Kudzu brought into North America is rapidly spreading through the southeastern U.S.
2. It is estimated that stray cats are responsible for the deaths of over 40 million birds in Wisconsin alone each year.
Answer:
1=predation 2=mutualism
Explanation:
What color light is being reflected by green plants?
Explanation:
As such, plants look green because they absorb red light most efficiently and the green light is reflected.
Soil with the lowest porosity is composed of particles that are all
A large and angular
B different sizes and
C shapes
D large and rounded
E small and rounded
Answer:
B. Different sizes and shapes
Explanation:
I majored in Biology
Scientist have inferred the structure of Earth's interior mainly by analyzing
A. The Moon's Interior
B. The Moon's Composition
C. Earth's Surface Features
D. Earth's Seismic Data
Answer:
Earth's seismic data
Explanation:
what is the transfer of pollen from the anther to the stigma of a flower.
Answer:
Pollination is the act of transferring pollen grains from the male anther of a flower to the female stigma. The goal of every living organism, including plants, is to create offspring for the next generation. One of the ways that plants can produce offspring is by making seeds.
:)
Answer:
Pollination
Explanation:
The transfer of pollen from the anther (male part) to stigma (female part) of a flower is called pollination.
Hope it helps and is correct:)
Which of the following best describes DNA in a prokaryotic cell?
A sunflower is placed facing away from a window. The following day, the sunflower is facing the window. This is due to
Answer:
because plants faces and gets sunlight to grow
Explanation:
horizon.
At night, in its absence, the sunflowers face east again, anticipating the sun’s return.
They do this until they get old, when they stop moving. Then, always facing east, the old flowers await visits from insects that will spread their pollen and make new sunflowers. Those flowers too, will follow the sun.
How is the proportion of hydrogen to helium in the Sun's core changing over time?
Answer: The percentage of the helium will increase with the decrease in the percentage of the hydrogen.
Explanation:
The conversion of the hydrogen into helium occurs by the nuclear fusion of the hydrogen atoms. This process reduces the hydrogen density and reduces the energy production inside the core region. Typically, in the core region of the hydrogen is converted into the helium by nuclear fusion. Four hydrogen atoms are collectively fuse to form one atom of helium. This process involves the production of heat energy.
Which type or types of energy does a blimp circling above a sporting event have?
A) kinetic energy and gravitational potential energy
B) kinetic energy and elastic potential energy
C) potential energy only
D) kinetic energy only
Answer:
A
Explanation:
Answer:
A is correct
Explanation:
Transcription is the process in which
DNA is used to make protein
DNA is used to make single stranded mRNA
DNA is used to make double strand mRNA
DNA is used to make more DNA
Answer:
d
Explanation:
Which health effects are concerns for people who get exposed to the low
levels of radiation that might remain in the environment in the years after an
accident at a nuclear reactor?
A. First-degree burns from thermal pollution
B. Exposure to parasites that can attack the digestive system
C. Respiratory diseases resulting from air pollutants
D. Thyroid cancer and other cancers
a
Answer:
D. Thyroid cancer and other cancers
Explanation:
Ap€x
Which of these best describes the tiny leg bones that some whales have, which do not aid in their movement or serve any other function?
O structures that grow and improve in function as they are used
O structures that function at certain times of the year or under certain conditions
O structures that will become adaptations when the environment changes
O structures that have lost all or most of their function over evolutionary time
Answer:
D. structures that have lost all or most of their function over evolutionary time
Explanation:
the question states that the leg bones are almost entirely unused because of evolution
The study of change over a period of time is called evolution.
The correct answer of the following is D.
The change in the species over the period of time is called evolution. It is necessary to adapt itself in order to survive in nature.
According to the lamark, it is said that the organs which are no longer used in the body will become vestigial and will be removed from the body over a period of time.
According to the question, the small bones in the whale is might have functioned in the ancestor period but not in the current time due to the course of the evolution.
Hence, the correct answer is D that structures that have lost all or most of their function over evolutionary time.
For more information, refer to the link:-
https://brainly.com/question/14698383
Lionfish are native to the tropical waters of the Indo-Pacific. What conclusions can be made about the impact of climate change on the range of lionfish and, therefore, on biodiversity?
Answer:
The correct answer is - Climate change has restricted the habitat of lionfish. It has become an endangered species, reducing biodiversity.
Explanation:
As we know it is native to the tropical waters of the Indo-Pacific region. The change in the climate will increase the temperature of the water and this will lead to the restriction of habitat which lead to the reduction in the population of the fishes. As they live in the tropical climate they are habitual of warmer water and can not survive the climate change.
1. Ultimately, is Hydraulic Fracturing socially responsible? Does Marginal Social Benefit (MSB) =
Marginal Social Cost (MSC)? Explain your answer with details from your reading.
Answer: Yes as the damage is minimal, I don't have your reading but the research is out there.
Explanation:
Which process has evolved to yield the GREATEST variation of offspring?
A.Meiosis
B.Mitosis
C.Replication
Meiosis has evolved to produce the greatest variation of offspring.
What is meiosis?Meiosis is a type of cell division that occurs in eukaryotic cells, such as those in animals and plants, to produce reproductive cells (gametes) that have half the number of chromosomes as the parent cell.
During meiosis, chromosomes pair up and genetic material through a process called crossing over, creating genetic diversity among the gametes. This diversity increases the chances that at least one offspring will be better suited to its environment and increase the survival chances of the species.
Learn more about meiosis, here:
https://brainly.com/question/29383386
#SPJ6
In What phase of meiosis does Chromosomal reduction occur?
3 interesting facts about strokes
Answer:
Stroke Facts
In 2018, 1 in every 6 deaths from cardiovascular disease was due to stroke.
Someone in the United States has a stroke every 40 seconds. ...
Every year, more than 795,000 people in the United States have a stroke. ...
About 185,000 strokes—nearly 1 of 4—are in people who have had a previous stroke.
I gave you more than three just in case you don't think of one
How have humans affected the Chesapeake Bay ecosystem food web?
Answer:
Algal blooms caused by pollution and the lack of oysters in the Bay has led to the decline of ocean floor algae, plants, and like sea grass and an overgrowth of bacteria. Jellyfish that were once rare are now common.
Explanation:
Hope thats helpful.
please help me there is 8 question please
Answer:
1. B mass/distance
2. B Gravitational attraction between the sun and Venus
3. A All objects would fly off into space
4. B Axis
5. A Rotation
6. A Increases
7. B Decreases
8. When there is no force acting on an object, it won’t change it’s path and will keep going straight until another force acts upon it.
Pollination is an example of which of the following ecological relationships?
A) Predation
B) Mutualism
C) Commensalism
D) Parasitism
Answer:
B.) mutualism
thanks me later
What is a food web?
1. How several food chains are related
a food chain with two levels
2. A group of animals
3. A producer and consumer relationship
Answer:
Q no. 1
Explanation:
1) How several food chains are related a food chain with two levels
Answer:
1 How several food chains are related a food chain with two levels
