Answer:
natural selection
Explanation:
Where do the high energy electrons carried by NADPH come from?
Answer:
The light absorption in chlorophyll
Explanation:
Answer:
The high energy electrons were produced by light absorption in chlorophyll to chemical reactions elsewhere in the cell.Explanation: basically the plant absolves light around the same are as photosynthes
Explain the term “molecular clock” and describe the types of measurements and comparisons that can be made with this type of clock.
Be sure to answer this question in paragraph form using complete sentences.
Answer:
In biology, a molecular clock can be described as a method to determine the time for the divergence of species which occurred by the process of evolution. The mutation rates of different molecules are used in this method. The mutation rates for DNA sequences and amino acid sequences are usually considered. The molecular clock can be used to compare and estimate the splitting of a lineage. For example, by this method, one can interpret when the chimpanzees and humans diverged from each other.
A molecule that can be used as a molecular clock has a neutral mutation rate of one mutation per 5 million years. How many years ago did two species share a common ancestor if the molecules found in these two species differ by a total of eight mutations?
1.5 million years
10 million years
40 million years
20 million years
Answer:
D) 20 million years
Explanation:
Measure of evolutionary changes over time
# Differences (Mutations) x Rate of mutations
Divide by the number of species
8 x 5 million years
40 million/2
20 million years
Final answer:
Using the molecular clock method, where a mutation occurs every 5 million years, and the two species differ by eight mutations, the two species shared a common ancestor approximately 40 million years ago.
Explanation:
The concept of a molecular clock involves using the rate at which mutations accumulate over time to estimate the evolutionary divergence between species. Assuming a steady mutation rate, we can calculate the time since two species shared a common ancestor. In this instance, the mutation rate is one mutation per 5 million years. If two species differ by eight mutations, we simply multiply the number of mutations by the rate at which they occur to determine the time elapsed.
To calculate, we have:
8 mutations × 5 million years/mutation = 40 million years
Therefore, based on the given mutation rate, the two species are estimated to have shared a common ancestor around 40 million years ago.
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A soccer ball sits unmoving on a field. Which statement best explains why it remains at rest on the ground?
The normal force is less than the gravitational force.
The normal force is equal to the gravitational force.
The normal force is greater than the gravitational force.
The normal force and gravitational force act in the same direction.
Answer:
b
Explanation:
i mean for it to not move it has to be equal i believe
A soccer ball remains unmoving on a field because the normal force is equal to the gravitational force, resulting in a balanced force scenario with a net force of zero.
A soccer ball sits unmoving on a field because the normal force is equal to the gravitational force. The gravitational force, which is essentially the weight of the soccer ball, acts downward towards the center of the Earth. Conversely, the normal force, which is the force from the ground supporting the soccer ball, acts upwards and is perpendicular to the surface of the Earth. Since the soccer ball is at rest, these two forces equalize each other, resulting in a net force of zero. This scenario reflects Newton’s first law of motion, which states that an object at rest will stay at rest unless acted upon by a net external force. In this case, since the normal and gravitational forces are balanced, the soccer ball remains unmoving.
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Pollution can lead to harmful algal blooms in waters off the coasts of southeastern U.S. states. Which problems are associated with harmful algal blooms?
A)increases in the severity and frequency of hurricanes B)poisoning of seafood and collapse of commercial fisheries C)contamination of beaches and sea vessels with pollutants D)decreases in the levels of photosynthesis occurring in ocean waters
Answer:
Poisoning of seafood and collapse of commercial fisheries
Explanation:
Complete the flowchart to show to show the process of photosynthesis
Answer AND Explanation:
Chlorophyll absorbs light energy which is used to split water molecules into oxygen and hydrogen atoms. The hydrogen atoms enter the dark stage while oxygen is released in the atmosphere.
In the dark stage carbon dioxide combines with hydrogen atoms to form simple sugars such as glucose.
Answer:
Chlorophyll absorbs light energy which is used to split water molecules into oxygen and hydrogen atoms. The hydrogen atoms enter the dark stage while oxygen is released in the atmosphere.
In the dark stage carbon dioxide combines with hydrogen atoms to form simple sugars such as glucose.
Explanation:
SUPER EASY QUESTION THAT INCLUDES THE ANSWER!
Does this model represent a compound? Explain your answer.
[tex]Sample-Response[/tex]: The model does not represent a compound because it shows two atoms of the same element combined. To be a compound, the model would need to contain atoms of different elements, represented by different-colored balls.
Answer:
No it does not represent compound
Compounds are made of 2 or more Different types of Elements
Elements should be different
Here,As Atoms are of same size and color
that indicates Same atoms
So, Atoms should be of different color or size to form a compound
Answer:
The model does not represent a compound because it shows two atoms of the same element combined. To be a compound, the model would need to contain atoms of different elements, represented by different-colored balls.
Explanation:
Its the answer you gave. Glad I could help!
Which statement is true?
The combustion of biomass can replace fossil fuels in conventional power plants
Hydroelectric energy uses the energy from the sun which is a renewable resource
Oil is a non-renewable resource that is hardly ever used, so there is not a concern of depleting the Earth's supply
Solar energy is a non-renewable resource that is used by many countries all over the world
The combustion of biomass can replace fossil fuels in conventional power plants
In conventional power plants a source of heat is used heat liquid water to high-pressure steam and the steam is used to turn turbines with a dynamo effect that produces electricity. This source of energy can be anything that produces energy when decomposed.
Explanation:
Usually, this source of energy is fossil fuels because it is cheaper and has high calorific value. Biomass - carbon based organic matter such as dead tree logs- when burned, can produce heat energy required to turn water to steam, too. Biomass is a renewable source of energy in comparison to fossil fuels.
Hydroelectric energy emanates from the potential and kinetic energy of water, usually naturally flowing water, to turn turbines that produce electricity.
The sun is a renewable resources, unlike fossil fuels, because it is impossible to exhaust the sun's potential in all of the humanity’s existence on earth.
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Answer:
The combustion of biomass can replace fossil fuels in conventional power plants.
Explanation:
Hydroelectric energy emanates from the potential and kinetic energy of water, usually naturally flowing water, to turn turbines that produce electricity.
The sun is a renewable resources, unlike fossil fuels, because it is impossible to exhaust the sun's potential in all of the humanity’s existence on earth.
Which of the fallowing is an example of adaptive radiation?
Answer:
An example of adaptive radiation is the development of mammals after all the dinosaurs became extinct.
The Japan Trench formed at a _______________ boundary.
A) convergent
B) transform
C) divergent
The Japan Trench formed at a convergent boundary.
Explanation:
Japan trench is the oceanic trench division present in the pacific ring off fire located at the northeast of Japan. The trench subducts under the continental plate i.e. Okhotsk plate which is also a part of north America. One of the main cause behind repeated tsunamis and earthquake is the japan trench as it is associated with subduction zone were continuous movement takes place. Convergence of pacific plate and Okhotsk plate give rise to the japan trench.
Five ways that the membrane can deal with material
Explanation:
Membranes function in a variety of ways. They maintain the osmotic balance (solute concentrations) within cells, keep foreign substances and other cells out, and expel waste...
This is further broken down as:
passive diffusion - some small ions may cross the membrane at will, anytime without restrictionsactive transport - moves molecules across the membrane against their concentration gradientfacilitated diffusion - only allows specific substances to cross the membrane via transport proteins after they are recognisedexocytosis- expulsion of waste material from the cellhighly charged, and otherwise large molecules are prevented from crossing the membrane- these require specialized mechanisms like endocytosis
Active transport is a mediated process that requires an energy input and the use of specialized membrane proteins to move against the concentration gradient. These proteins require energy in the form of adenosine triphosphate or ATP in order to facilitate necessary conformational changes to the large protein molecules to alter the spatial location of the molecule. For instance, with Na+, K+ pumps in cell membranes.
However, via passive transport or diffusion, small molecules can move from regions of high concentration to regions of low concentration until an equilibrium is reached. This occurs along the concentration gradient, and usually involves small non polar molecules in cells such as oxygen and carbon dioxide.
Facilitated diffusion is used for the transport of large molecules unable to cross the plasma membrane at will. However, passive diffusion, describes the movement of substances (small molecules and ions) across the membrane, along their concentration gradient.
During endocytosis large molecules cells and cell fragments moved across the plasma membrane through a process of invagination; piece of the external cell membrane falls into itself and forms a small pocket that surrounds the target molecule, this breaks off from the membrane to form an intracellular vesicle.
In exocytosis, large particles (proteins, neurotransmitters, waste material etc.) are surrounded by a phospholipid membrane in a vesicle. However, this membrane is formed in the cytoplasm, and attaches to the plasma membrane’s interior in a process opposite to endocytosis; material is removed from the cell and exported into the cell’s exterior called the extracellular space.
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What makes a plant transgenic?
What is a benefit of using nonrenewable resources? (3 points)
Answer:
They are abundant and affordable
They include fossil fuels such as oil, natural gas, coal, and uranium used for nuclear energy. Despite this, they have a couple of advantages: The main advantages of non-renewable energies is that they are abundant and affordable. For example, oil and diesel are still good choices for powering vehicles.
How is str data used in a dna paternity test?
Answer:
str alleles comes from a persons father , one from their mother. DNA paternity test , the analysis seeks matches of allele number values between the alleged father and child
1. Label letters A-G in the picture of photosynthesis below.
2. What is the name of the stage of photosynthesis that occurs on the left side of the line drawn above?
3.What is the name of the stage of photosynthesis that occurs on the right side of the line drawn above.
5. In what part of the chloroplast does this stage occur?
Answer:
A:grana
B:water
C: oxygen
D: ATP
E:NADPH
F: phosphate
G: glucose
2: light stage
3:Dark stage
4:stroma(dark) and grana(light)
Many corn farmers rotate their crops with soybeans in a season when corn is not being grown. The most likely impact this practice has on soil quality is
It helps in reducing soil erosion and increases soil fertility and crop yield.
Answer:the answer is D
Explanation:
Which diagram correctly displays the order of events during egg formation?
primary oocyte ® secondary oocyte meiosis I ® meiosis II ® ovum
O ovum ® meiosis IⓇ primary oocyte meiosis II ® secondary oocyte
O primary oocyte meiosis l ® secondary oocyte meiosis II ® ovum
O primary oocyte meiosis I ® ovum ® meiosis II Ⓡ secondary oocyte
Answer:
The order of events during egg formation:
Primary oocyte - meiosis l - secondary oocyte - meiosis II - ovum
Explanation:
The process of egg formation is called oogenesis. During oogenesis the primary oocyte is formed when oogonia arrest at prophase-I of meiosis I. Further division of primary oocyte is arrested.
At puberty the primary oocyte, a diploid cell divides to form one haploid secondary oocyte and one polar body. Thus, at the end of meiosis I one secondary oocyte is formed, after meiosis II secondary oocyte forms ovum.
The energy that is released by cellular respiration is in the form of
dark energy.
solar energy.
nuclear energy.
chemical energy.
Answer:
The correct option is D. chemical energy
Explanation:
Cellular respiration can be described as a chemical reaction by which ATP is synthesized.
Sugar in the form of glucose and oxygen combine by this process to release water and carbon dioxide. ATP is generated by this chemical reaction which is an energy fuel. The ATP formed as a result of cellular respiration is used by the cells to carry out their normal functions. Hence, option D is the correct answer.
Answer: D)chemical energy
Explanation:
What structures in plants allows for water and nutrients to be transported
Which process makes it possible for the major organs of the body to be formed by week 10 of human development
The process that makes it possible for major organs of the body to be formed by 10th week of human development is differentiation.
Explanation:
Human development is started off by the process of fertilization in which the sperm and ovum fuse to form zygote. In human beings fertilization takes place in the oviduct of the female. The zygote that is formed undergoes mitosis to form the embryo.
The embryo then gets embedded in the uterine walls. It continues dividing and differentiating into several organs. Almost all of the organs are formed by tenth week of pregnancy even though they aren’t fully developed.
The embryo has three layers namely ectoderm, mesoderm and endoderm. Ectoderm develops into outermost skin layer, central and peripheral nervous system, eyes and inner ears. Baby’s heart and circulatory system is formed from the mesoderm and the baby’s lungs and intestine develop from the innermost layer called endoderm.
(t or f) small, hydrophilic molecules cannot just flow into the cell, they need help to pass through the plasma membrane
When was Charles Darwin born and where is he from?
Answer:
Born February 12, 1809, Shrewsbury, Shropshire, England
Explanation:
Final answer:
Charles Darwin was born on February 12, 1809, in Shrewsbury, England. He became a renowned naturalist and theorized evolution through natural selection, especially after his journey on the HMS Beagle. Darwin's work has significantly influenced the scientific understanding of biological diversity and evolution.
Explanation:
Charles Darwin's Birth and Origin:
Charles Darwin was born on February 12, 1809, in Shrewsbury, England. Hailing from the United Kingdom, he became one of the most renowned naturalists of his time, credited with developing the theory of evolution through natural selection. Darwin's observations and studies, most notably on his voyage aboard the HMS Beagle, led to profound insights into the diversity and adaptability of species.
Darwin's formative journey took place from 1831 to 1836, during which he visited various places such as South America, Australia, and the Galápagos Islands. His observations of the distinct species, notably the finches of the Galápagos, and their variations across different islands, fueled his understanding of how species could evolve over time. Darwin notably discussed these ideas in his seminal work, On the Origin of Species by Means of Natural Selection, published in 1859.
Darwin's Impact on Science:
Darwin's theories laid the groundwork for the modern understanding of the living world and biological evolution. His work influenced not only biologists but also artists and intellectuals, reshaping the way we perceive humanity's place in the natural order. Charles Darwin's legacy is one of a pioneering scholar who transformed our view of life on Earth through his revolutionary ideas on natural selection and the adaptability of species.
A type of Algae grows on a sloth. What must be true for the algae and the sloth to have a commensal relationship?
Final answer:
For a commensal relationship between the algae and the sloth, the algae must benefit while the sloth is unaffected.
Explanation:
In order for the algae and the sloth to have a commensal relationship, the algae must benefit while the sloth neither benefits nor is harmed. In this relationship, the algae grows on the sloth, using it as a substrate for growth, while the sloth is unaffected by the presence of the algae.
Algae are a diverse group of photosynthetic organisms that can range from single-celled microscopic organisms to multicellular structures, such as seaweeds. They can be found in various habitats, including freshwater, marine environments, soil, and even in symbiotic relationships with other organisms like fungi in lichens.
Identify which molecule or element is described below. Part of all organic compounds
Final answer:
Carbon is the element that is part of all organic compounds due to its ability to form four covalent bonds, making it essential for the structure of biomolecules such as carbohydrates, lipids, proteins, and nucleic acids.
Explanation:
The element described as being part of all organic compounds is carbon. This is because organic compounds are primarily composed of carbon atoms (C) covalently bonded to hydrogen atoms (H), and often include other elements such as oxygen, nitrogen, sulfur, and phosphorus. Carbon's ability to form four single covalent bonds makes it incredibly versatile and the backbone of organic chemistry. The simplest organic compound is methane, where four hydrogen atoms are bonded to a single carbon atom. Organic molecules are vital to life and include biomolecules such as carbohydrates, lipids, proteins, and nucleic acids.
Which beat summarises the flow of energy in a producer
Answer:
sun>Chloroplasts> mitochondria
Explanation:
Which of the following is a natural cause of carbon increases and decreases?
Question 2 options:
clearing of land for new development
collecting and burning natural gas
plant growth related to weather
water usage related to fires
Answer:
collecting and burning natural gases
Explanation:
I I hope this answer helps you x x
The diagram below shows some key steps of a biotechnological procedure. What development does the letter X most likely represent?
A) human cells able to resist antibiotics
B) human cells unable to synthesize antibodies
C) bacterial cells able to synthesize human insulin
D) bacterial cells unable to synthesize human insulin
The diagram below shows some key steps of a biotechnological procedure. The development does the letter X most likely represent - C) bacterial cells able to synthesize human insulin.
Recombinant DNA is a technology scientists developed to produce human genes such as human insulin in commercial use.
it is a biotechnological procedure.in this scientists insert a human gene into the genetic material of a common bacterium.This “recombinant” bacteria could now produce the protein encoded by the human gene.Thus, the development does the letter X most likely represent - C) bacterial cells able to synthesize human insulin.
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below shows an example,
5.
Genetic variation can arise in a number of different ways. The picture below shows an en
When might the process take place that allows this genetic variation to occur?
XX-XX-X
A. during fertilization
B. during meiosis
C. during DNA replication
D. during binary fission
How many rings does chlorophyll a and b have
Explanation:
Each has one chlorin ring- chlorin is a form of porphyrin.
Chlorophylls are comprised of a ringed molecule, chlorin, a hydrogenated form of porphyrin which contains a magnesium ion at the center, bonded to four atoms of nitrogen. Varying types of Chlorophyll have side chains, which affect the absorption spectrum of the molecule for instance A has a methyl group bonded to the C7 position, while B has an aldehyle (CHO) group at this location.
Embedded within the thykaloid membrane of chloroplasts, chlorophyll a and B mainly absorb orange-red and violet-blue wavelengths and convert light energy into chemical energy for the process of photosynthesis. This occurs in the light-dependent reactions of photosynthesis, within chloroplasts of plants. The range of wavelengths absorbed by a pigment is its absorption spectrum while it reflects those outside of this range. Plants appear green as this region of light is reflected by the pigments.
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Humans have 23 pairs of chromosomes (46 total). How many chromo-
somes would a human cell have? Draw one chromosome for each case
a. at the end of mitosis?
b. at the end of meiosis I?
c. at the end of meiosis II?
Answer:
23
Explanation: