The years in which two species share a common ancestor if the molecules found in these two species differ by a total of six mutations is 72 million years.
What is mutation?Mutation is the changing of gene or characters of any species over time, there are many reasons for mutation, like natural selection.
Every 12 million years, the molecular clock will mutate.
If the molecular clock experiences six mutations, 12 million years multiplied by 6 have passed.
12 x 6 = 72
Thus, the years are 72 million years. Option is b.
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Answer:
D) 36 million
Explanation:
The person above forgot the last step: Divide by the number of species
When a red onion cell is placed in a 5% NaCl solution, the central vacuole will occupy
A) even more of the cell than when it was in water
B) less of the cell than when it was in water
C) the same amount of the cell as when it was in water
Answer:
A=even more of the cell than when it was in water
Answer:
When a red onion cell is placed in a 5% NaCl solution, the central vacuole will occupy
B) less of the cell than when it was in water
This is due to plasmolysis
Explanation:
What is plasmolysis?Plasmolysis is the process in which there is a loss of water from cells when these are placed in a hypertonic solution. The protoplast and vacuole shrinks away from the cell wall.
What is a hypertonic solution?Hypertonic solution is that which has higher concentration of solutes (low water concentration) as compared to inside the cell. As water moves from high conc. to low conc., it moves from inside the cell to outside. Thus, the vacuole pulls away from the cell when placed in a hypertonic solution (5% NaCl).
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The majority of the symptoms of tetanus infection are caused by the tetanus toxins, chiefly tetanospasmin. Tetanospasmin is one of the deadliest toxins known; even very small doses (nanograms) can be lethal. It targets the nerves, causing severe muscle spasms. The tetanus vaccine consists of inactivated tetanus toxin; the vaccine is highly effective for preventing tetanus. Inoculation with the tetanus vaccine leads to the production of protective antibodies. How do these antibodies prevent tetanus
Antibodies prevent tetanus as they neutralize the free form of powerful exotoxin produced.
What are antibodies?It should be noted that antibodies are the protective proteins that are produced by the immune system.
In this case, antibodies prevent tetanus as they neutralize the free form of powerful exotoxin produced. This is important to fight the infection.
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Review 2
A Write True or False for each statement.
1. Red blood cells have no nucleus.
2. While blood cells contain hemoglobin.
3. Amoebas are smaller than bacteria.
4. Plants and animals are multicellular.
5. Cells require water to divide..
6. Water moves across cell membranes by osmosis.
7. White blood cells destroy invading bacteria.
8. Cells that work together are called tissues.
What is the original purpose of a
quick stimulus and response in
the body?
A. to protect itself and respond quickly to
dangerous situations
B. to learn about the world
C. to evolve the senses
D. to conserve energy and not move as much
Answer:
A
Explanation:
To protect itself and repond quickly to dangerous situation
What is the percent by mass water in calcium chloride hexahydrate?
Answer:
the answer is 3%
It would be 3%.
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>Rijja<
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What stimulates the secretion of parathyroid hormone from the parathyroid gland?.
Answer:
Low calcium levels in the blood
Explanation:
In primary hyperparathyroidism, one or more of the parathyroid glands is overactive. As a result, the gland makes too much parathyroid hormone (PTH). Too much PTH causes calcium levels in your blood to rise too high, which can lead to health problems such as bone thinning and kidney stones. this will happen if parathyroid hormones got high in human body..
Answer:
Low blood calcium
Explanation:
Natural selection results in ______. Group of answer choices a decrease in the size of a population. an increase in the size of a population. increased genetic variation. offspring adapted to their current environment
Answer:
increase in genetic variation
EASYYYYYY
If global warming continues, what do you think will happen to the glaciers and icecaps of the Earth? What consequences will this have for people and other living things?
Answer:
Glaciers and Icecaps will melt.
The Consequences would be,
- Animals will lose their habitat due to melted Icecaps. Animals like polar bears, arctic foxes, snowy owls, reindeer, etc. They may also get extinct.
- It will create more frequent and intense coastal storms like hurricanes and typhoons.
- Coniferous plants will have problems
Answer:
The glaciers and icecaps will eventually melt
The small intestine has special structures, called villi, which help absorption of digested food. Which of the following is NOT a feature?
B1. Good blood supply
B2. Impermeable walls
B3. Large surface area
B4. Thin layer of cells
B2) Impermeable walls
Villi together with it's microvilli tremendously increase surface area of absorption. And hence supports effective absorption of nutrients into blood. Villi have permeable membranes . Thus, nutrients can easily get their way through them.
If square is dominant over round, what are the phenotypes for the following genotypes?
SS
Ss
ss
Answer:
SS: square Ss: square ss: round
Explanation:
The dominant trait is the capital letter
___ is a term standing for enlargement of the heart.
Cardiomegaly is a term standing for enlargement of the heart.
What is cardiomegaly?Cardiomegaly is a heart condition that occurs due to blockage of heart blood vessels or viral infections leading to the weakening and enlargement of the heart.
Therefore, cardiomegaly is a term standing for enlargement of the heart.
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Cardiomegaly is the term used for the enlargement of the heart. Details about cardiomegaly can be found below.
What is cardiomegaly?Cardiomegaly also called megalocardia is the condition of having an enlarged heart.
The heart enlarges because of damage to the heart muscle. An enlarged heart can still pump blood normally to a certain point but can get worse and lead to heart failure as time goes on.
Therefore, Cardiomegaly is the term used for the enlargement of the heart.
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What is the correct order for respiration?
what does the immune system do to fight off malaria?
Answer:
The body raises the temperature of the body to create an unlivable area for the parasite.
Explanation:
Monomers are single organic
compounds that can link together to
form larger compounds.
What are the lipid monomers?
A. fatty acids and mitochondria
B. fatty acids and ATP
C. fatty acids and glycerol
D. fatty acids and DNA'
Monomers are molecules of simple structure that compose the polymers. Option C. fatty acids and glycerol.
What are monomers?
Monomers are the basic unit of polymers. When many monomers join through chemical bonds they form a polymer.
There are many types of monomeric molecules. To name a few, we can mention
Monomer Polymer
• Monosaccharide ⇒ Carbohydrates
• Fatty acid ⇒ Lipids
• Amino acid ⇒ Proteins
• Nucleotide ⇒ Nucleic acids
Monomers are organic molecules of reduced molecular mass and relatively simple, defined structure.
Monomers are composed of carbon, oxygen, and hydrogen atoms, which establish covalent bonds.
In the case of lipids, fatty acids and glycerol are the composing monomers.
Lipids have a hydrophilic head composed of glycerol and hydrophobic tails composed of fatty acid chains.
The correct option is C. The lipids monomers are fatty acids and glycerol.
In the attached files you will find the image of a phospholipid.
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The arteries a. serve as rapid-transit passageways from the heart to the organs because of their large radii b. act as a blood reservoir because they have the capacity to store large volumes of blood with little change in their internal pressure c. are the major sites of blood flow resistance in the vasculature d. are the site of exchange between the blood and surrounding tissues e. none of these
The arteries act as rapid-transit passageways from the heart to the organs because of their large radii. The correct option is A.
Functions of the arteriesThe arteries are blood vessels that carry blood away from the heart to the cells, tissues, and organs that are in need of oxygen.
They have large radii and as such, serve rapid-transit passageways from the heart to the various cells, tissues, and organs.
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three main factors that affect stroke volume and how each impacts cardiac output if that factor is increased?
The three main factors that affect stroke volume are contractility, preload and afterload.
Increase in contractility and preload increases cardiac output whereas increase in afterload decreases cardiac output.
What is stroke volume?Stroke volume refers to the volume of blood that is pumped by the heart through each stroke.
The three factors that affect stroke volume and how it impacts cardiac output when increased is given below:
contractility - an increase in contractility of the heart increases the cardiac outputPreload - an increase in preload increases cardiac outputafterload - an increase in afterload decreases cardiac outputTherefore, the three main factors that affect stroke volume are contractility, preload and afterload.
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Aristotle is considered to be the founder of biology.
true
false
Answer:
False.Aristotle is chemist he not the founder of biology
The following steps are involved in the process of RNA synthesis: I. Elongation II. Termination III. initiation Rearrange them in the ascending order of the process.
Explanation:
1 initiation
binding of RNA polymerase
2 élongation
synthesis of chain
3 termination
end of synthesis and production of rna
Is the neurone a cell, tissue or an organ?
Answer:
Cell
Explanation:
Glial cells and neurons are the two types of cells that make up the nervous system. Four tasks are carried out by glial cells, which make up the nervous system's supporting framework: Give the neurons structural support. protect the neurons. A neuron is a specialized, impulse-conducting cell that is the functional unit of the nervous system, consisting of the cell body and its processes, the axon and dendrites. Three components make up neurons (nerve cells), which perform the integration and communication processes. Axon terminals, dendrites, and axons. The cell body, also known as the soma, is their fourth component and is responsible for the fundamental functions of neurons. In the illustration to the right, a "typical" neuron is depicted. The neuron, a specialized cell created to send information to other nerve cells, muscle cells, or gland cells, is the basic functional unit of the brain. Neurons are nervous system cells that communicate information to other nerve, muscle, and gland cells. Axons, dendrites, and a cell body make up the majority of neurons.
Answer:
nerve type of cell
Explanation:
I looked it up
what does the somatic nervous system do ?
According to the research, the somatic nervous system is responsible for transmitting sensory information as well as to the muscles.
What is the somatic nervous system?It is a complex group of nervous structures that is divided into two main groups, these are the Central Nervous System and the Peripheral Nervous System.
It is responsible for transmitting sensory information and sending motor control information to the skeletal muscles.
Therefore, we can conclude that according to the research, the somatic nervous system is responsible for transmitting sensory information as well as to the muscles.
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The stage of the cell cycle during which the cytoplasm divides to form two cells is called:.
Which item is a carbon source?
OA. Burning of fossil fuels
OB. Fossil-fuel deposits
O C. Limestone rock formations
OD. Replanting of rain forests
Answer:
A
Explanation:
Burning of fossil fuels
Would you expect the plastid DNA of photosynthetic dinoflagellates, diatoms, and golden algae to be more similar to the nuclear DNA of plants (domain Eukarya) or to the chromosomal DNA of cyanobacteria (domain Bacteria)? Explain.
would cause evolutionary change in animal populations that colonize a new environment as its conditions differ from those found in their home?
Gene flow would cause an evolutionary change in animal populations that colonize a new environment as its conditions differ from those found in their home.
What is Gene flow?In genetics, the expression 'gene flow' refers to the migration of organisms or movement of their reproductive germinal cells to a new place.
Gene flow is well known to alter the genetic structure of the population in the site where it occurs.
In conclusion, gene flow would cause an evolutionary change in animal populations that colonize a new environment as its conditions differ from those found in their home.
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The area around the Sahara desert is slowly changing into a dry region like desert. Which trait is most likely to be selected in the population of plants growing in this region?
Answer:
drought resistant trait
Bees are commonly found near flowering plants.
(a) Describe how bees help plants to reproduce.
Answer:
bees like flowers because they have pollen in their wings, and it makes them happy, and that’s nice. They make beautiful little things that can be used to make honey.
Explanation:
The foundation of the best honey is flowers and pollen. When they’re all in bloom, it’s a wonder for bees to come to them—not because of their beautiful colours but rather for how much sweetness there is in them. The smell alone makes every person nearby fall in love with bees. The only downside? The flowers die within weeks when exposed to too much pollen. They can only take so many blooms before it becomes too toxic for humans to eat, even if they don’t have to go through the hassle of killing a human to obtain them.
But that doesn’t mean bees hate the sight of flowers.
It has been said that flowers are what make people happy. That they can make anyone smile despite the circumstances. And maybe if people saw more flowers they would be happier? But it doesn't always work like that.
The plants around her garden
Answer:
PollinationExplanation:
In its natural state, the flower is inverted with the standard petal at the bottom. when a heavy insect such as BEE visits the flower, it lands on the standard petal.The Insects follow the nectar guide into the flower.The insect forces its way in between the two wing petals and moves in to collect the nectar.The insect's back forces the keel petal upwards to expose the stigma and anthers. The stigma and anthers brush against the hairy back of the insect. when this happens, some pollen grains from the anther stick to the hairy back of the insect. At the same time, pollen grains on the insect's back (from another flower which the insect had visited earlier) are transformed into a sticky stigma.when the insect leaves the flower, the keel springs back to its original position to enclose the stamen and the stigma again.Refer to Attachment
Which organelle is responsible for giving plants colors other than green?
vacuole
chloroplast
mitochondria
lysosome
DNA is organized into structures called
microtubules
chromosomes
thylakoid stacks
nuclei
Answer:
chloroplast
chromosome
Explanation:
same
Answer:
Correct answer is vacuole.
Explanation:
Vacuoles containe anthocyanin pigment which makes vacuoles to appear in different colour such as red, blue and purple.
DNA is organized into structures called chromosomes.
Chromosome is made up of DNA tightly coiled many times around protein histone.
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When under excessive passive tension, what muscle limits scapular upward rotation, posterior tilting, and external rotation?
Pectoralis minor is the muscle which limits scapular upward rotation, posterior tilting, and external rotation when under excessive passive tension.
What is Pectoralis minor?This muscle is found below Pectoralis major and originates from the middle ribs to the scapula.
When under pressure this muscle limits the various types of movements which are mentioned above.
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Which two dog breeds originally come from a canadian province?.
Answer:
Tahltan bear dog, the Canadian Inuit dog,
Explanation:
How are mitosis and meiosis similar?
Answer:
B
both process chromosomes are copied
