Answer:
D.) repressor DNA-binding site mutation
Explanation:
lacl prevents the repressor polypeptide is a mutant that prevent operon from binding lactose, and thus will bind to the operator and be non-inducible.. This mutant will represses the lac operon whether lactose is present or not and the lac operon will not be expressed. It is also called“super-supperesor".
The lacI locus – One type of mutant allele of lacI (callled I-) prevents the production of a repressor polypeptide or produces a polypeptide that will not allow to bind to the operator sequence.
This is also a constitutive expresser of the lac operon because absence of repressor binding permits transcription.
How are coral reefs similar to tropical rainforests?
Ó Both are home to just a few types of rare animals.
Both can easily be restored if they are destroyed.
Both support a huge quantity and variety of organisms.
O Both are found in all types of climates around the world.
Answer:
Both support a huge quantity and variety of organisms.
Explanation:
PLS HELP ME!!!!!!!!!!!!!
Answer:Water moving across the earth in streams and rivers pushes along soil and breaks down pieces of rock in a process called erosion. The moving water carries away rock and soil from some areas and deposits them in other areas, creating new landforms or changing the course of a stream or river
Explanation: my brain is bigger than jimmy neutron
Describe the role of a nebula in the life cycle of a star. Please use your own words
Answer:Stars are formed in clouds of gas and dust, known as nebulae. Nuclear reactions at the centre (or core) of stars provides enough energy to make them shine brightly for many years. The exact lifetime of a star depends very much on its size.
A star can be defined as a giant celestial (astronomical) object that is made up of a luminous sphere of plasma bounded together by its own gravitational force.
Generally, a star consists of two (2) main interstellar hot gas and these are:
I. Hydrogen (H).
II. Helium (He).
Some of the examples of a star are;
Sun (the closest to planet Earth). Antares. Canopus. Vega. Betelgeus.
A nebula simply refers to a low-density cloud of interstellar hot gas (hydrogen and helium) and dust.
Basically, a nebula is needed for the creation or formation of a star.
Hence, the role of a nebula in the life cycle of a star include the following:
Stage 1: The temperature increases in the center of a nebula, thereby, causing the small nuclei of atoms to fuse.
Stage 2: The nebula gets hotter and brighter as the nuclear fusion sets off a chain reaction while providing enough energy to turn the nebula into a star.
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How many hydrogen atoms are present in each water molecule?
A.
1
B.
3
C.
2
D.
4
Answer:
C. 2
Explanation:
Which equations are used to calculate the velocity of a wave?
Answer:
The Wave Equation
Multiplying the wave's frequency by its wavelength, which is its physical length, yields the velocity of the wave.
Explanation:
Answer:
Just v = f × λ
v is the wavespeed in m/s, f is the frequency (Hz) and λ is the wavelength (m)
how animals in the taiga have adapted to survive the extreme cold of winter.
I
Answer:
Some animals have adapted to life in the taiga by hibernating when temperatures drop. Other animals have adapted to the extreme cold temperatures by producing a layer of insulating feathers or fur to protect them from the cold. In some instances, the adaptation of a seasonal change in color of feathers or fur protects the animal from its predators.
Answer:
Some animals have adapted to life in the taiga by hibernating when temperatures drop. Other animals have adapted to the extreme cold temperatures by producing a layer of insulating feathers or fur to protect them from the cold. In some instances, the adaptation of a seasonal change in color of feathers or fur protects the animal from its predators.
Explanation:
SOMEONE HELP ME PLZ!!!!!!!!!!!!
When does the Mitosis-promoting factor (MPF) Cyclin concentration decline during a typical cell cycle in clam eggs?
A. when the cells grow larger
B. when DNA is synthesized
C. when haploid gametes are produced
D. when the cell nucleus divides
Answer:
D
Explanation:
Answer:
D
When the cell nucleus divides
Explanation:
What is the effect of the presence of double bonds in plant lipids?
A) the double bonds do not affect the properties of plant lipids
B)the double bonds cause plant lipids to freeze more quickly
C)the tails of plant lipids cannot pack as tightly together as animal ones
Answer: Option C.
C)the tails of plant lipids cannot pack as tightly together as animal ones
Explanation:
The tails of plant lipids cannot pack as tightly together as animal ones because the double bond in plant lipids make the hydrocarbon chains to bend making them no to pack tightly together which cause a reduction in van der Waals interaction between the fatty acids. The length of the double bond also affect the melting point of fatty acids . If the hydrocarbon chain is long, melting point will be high .
Put the boxes in the correct order
Answer:
This was the question you asked earlier and you deleted it after i wrote a whole essay so here. I hope its still of some use.
Explanation:
I believe the most useful ap to use for people of age is Faceb00k. Faceb00k is a safe and friendly app where people can share what there doing or pictures.
So many parents and grandparents use this today to share photos of younger family members, and others can like and comment on there posts. Although their are some who receive hate, most of the people are quite rather friendly.
People like to share there appreciation for l0ved ones by letting the whole world see them through Faceb00k. Most elderly people do this so there younger ones can look back at all the memories they had together. Yes, its true they can just not post it and still look back at memories, but they post it because if it gets deleted and you posted the photos online there will always be a way to recover them.
In conclusion, this is why I believe Faceb00k is the best ap for the more elderly people. Firstly, they can show there memories to the world by showing appreciation. And lastly, whenever you post something online it can always be recovered, so those valuable moments will not be forever lost.
Which cellular structure in plant cells is most responsible for having less flexible animal cells
Answer:
The cellulose cell wall in plants
Explanation:
All eukaryotic cells, both plant and animals cells have a cell membrane which is an outer covering of the contents of the cell. Also plants and animals cells have many structures and cell organelles in common such as the mitochondria, the endoplasmic reticulum, ribosomes, golgi bodies, etc. However, plant cells have a more rigid structure than animals cells because of the presence of an extra structure known as the cell wall, covering their cell membranes.
The cell wall is a rigid layer that is found outside the cell membrane and surrounds the cell, providing structural support and protection. The cell wall is composed mainly of cellulose, but contains proteins as well as other polysaccharides too.
Another structure present in plants that serves to maintain the rigidity of the plant cell is the large central vacuole. The main role of the vacuole is to maintain turgor pressure by pushing the plasma membrane against the cell wall due to the pressure of fluids contained within it.
To produce the highest possible oxygen concentration in the blood, gas exchange occurs in
only one direction at the respiratory membrane-from the lung to the blood.
O True
O False
Answer:
True
Explanation:
Answer:
false
Explanation:
The oxygen in inhaled air passes across the thin lining of the air sacs and into the blood vessels. This is known as diffusion. The oxygen in the blood is then carried around the body in the bloodstream, reaching every cell. When oxygen passes into the bloodstream, carbon dioxide leaves it.
which type of transport requires energy to move a cell
what is accuracy, precision, and reproducibility ? and why are they so necessary in conducting/designing experiments
Answer:
- Accuracy is the degree by which the measures obtained in an experiment and/or observational procedure are associated with true values.
- Precision is the level of reproducibility that these measurements exhibit in the same (constant) conditions.
- Reproducibility indicates the level of agreement of the results when they are obtained by different researchers by applying the same experimental and/or observational procedures.
Explanation:
In a scientific investigation, it is imperative to achieve higher levels of accuracy and precision when realizing measurements because it ensures that the information is correct (without mistakes). Thus, researchers always try to use better equipment and instrument to make their measurements. Reproducibility is important because it is the only condition that scientists can guarantee to other researchers when they arrive at a result.
Write the equation of a line that is parallel to y = 0.62 + 3 and that passes through the point (-3,-5).
Answer is y=0.6x-3.2
Answer:
y = 0.6.x - 3.2
Explanation:
The slope-intercept form:
y = mx + b
m - slope
b - y-intercept
We have
y + 0.6x + 3
Parallel lines have the same slope. Therefore we have the equation:
y + 0.6x + b
The line passes through the point (-3, -5). Put the coordinates of the point to the equation and solve it for b:
-5 = 0.6(-3) + b
-5 = - 1.8 + b
-3.2 = b
add 1.8 to both sides
Finally we have:
y = 0.6.x - 3.2
{Not mine :(}
Explain how weathering and erosion can make a cave. Is it physical or chemical weathering?
Answer: Weathering and Erosion could make a cave if the force is high enough, and it would be in the physical element because chemical is not entirely correct.
please help me with this question:)
Answer:
i believe mitochondria
Explanation:
I can't see it very well because it's blurry but if it has back and forth squiggles in the middle then it is the mitochondria plus the others are labeled with other stuff
Why do you think prokaryotic cells do not have all the organelles that eukaryotic cells do? What does this tell you about prokaryotic cells?
Answer:
Explanation:
A prokaryotic cell is a type of cell that does not have a true nucleus or membrane-bound organelles. Organisms within the domains Bacteria and Archaea are based on the prokaryotic cell, while all other forms of life are eukaryotic
A prokaryotic is a primitive cell that lacks organelles, unlike the eukaryotic cells, and are simple organisms.
What are prokaryotes?Prokaryotes are organisms that are simple and evolved before the complex eukaryote. They include bacteria and archaea that are simple and lack organelles that are found in eukaryotes.
They do not have a nucleus and rather have their genetic material disposed of as nucleoids in the center of the cell that undergoes the simple process of the central dogma.
The simple cellular processes and reproductive methods are the reason they lack many organelles. This tells that prokaryotes are simple and primitive types of cells.
Therefore, prokaryotes lack a distinct nucleus.
Learn more about prokaryotes here:
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Which of the following would a lipid most likely do in the body?
А. provide quick energy for exercise
B. store genetic information
С. build muscle tissue
D. store energy for later use
Answer:
D
Explanation:
Lipids have a carboxyl group at one end, a methane group at the other, and a long hydrocarbon chain in between. This structure makes it suitable for long-term energy storage. Quick energy is usually provided by carbohydrates. Nucleic acids store genetic information, and muscle tissue is made up of muscle cells.
The most likely function of a lipid in the body is the storage of energy for later use. Choice D.
Although, lipids are a good source of energy with about 9kcal of energy supplied per gram.
Lipid metabolism to provide quick energy is quite a slow process as opposed to carbohydrates which provide quick energy for exercise and other tasks.
Nucleic acids are responsible for storing genetic information.
Muscle tissues are built by muscle cells.
As lipids are a high energy yielding source, lipids are responsible for storing energy for later use.
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The two kinds of cells are Prokaryotes and Eukaryotes. How are they
different? *
O Prokaryotes have a nucleus.
OEukaryotes have a nucleus.
O Prokaryotes are plant cells
оThere is no difference.
Which term refers to the fact that naturally occurs omg he universe
Answer:
Scientific law.
Explanation:
A scientific law is a statement that the scientific community elaborates on after observing a natural phenomenon and performing several experiments concerning certain phenomena. Scientific laws aim to explain the reasons why something happens and what may cause it to predict it in the future.
SOMEONE PLZ HELP ME !!!!!!!!!!!!!!!!!!
Answer:
plant :)
Explanation:
Identify the parts of the DNA molecule below
Explanation:
where is question or diagram
What is true about sex chromosomes?
A. They carry genes for traits including those not related to sexual
characteristics.
B. In humans, both types of sex chromosomes are the same size.
C. A daughter receives both copies of her sex chromosomes from
her mother
D. They do not sort independently during meiosis.
How does the structure of bone allow it to function with the immune system? (PLEASE HELP QUICK THEYRE COMING)
Answer:
In addition to providing a structural support for the body and a reservoir for calcium, bone encases the bone marrow, a primary site for hematopoiesis and immune system development.
Explanation:
HELP ME ASAP!!!!
Select the correct answer.
Gina is scuba diving when she notices a large fish glide over her. It has a flattened body and she notices gills on its underside. Which taxonomic
group does the fish belong to?
A.
Selachii
B.
Batoidea
C.
Sarcopterygii
D.
Actinopterygii
Answer:
Your answer is B) Batoidea. Batoidea is a superorder of cartilaginous fishes commonly known as rays.
Answer:
b because the guy above me said so
Compare the normal allele for hemoglobin with the sickle cell allele. How does this difference affect the person’s red blood cells?
Answer:
Sickle cell anemia is an inherited condition in which there aren't enough healthy red blood cells to carry oxygen through an individual's body. The red blood cells of a healthy individual are flexible and round, and they move through blood vessels with no problem, transporting oxygen successfully. However, a person with sickle cell anemia has rigid, sticky red blood shaped like sickles or crescent moons. These cells often get stuck in small blood vessels, which can slow or block blood flow and oxygen delivery to different parts of the body.
The sickle cell anemia trait is found on a recessive allele of the hemoglobin gene, while the regular red blood cell trait is found on the dominant allele. This means that a person must have two copies of the recessive allele (one from their mother and the other from their father) to be born with this condition. People who have one dominant and one recessive allele or both dominant alleles will have healthy red blood cells.
What makes you throw up? Explain why and how you know.
school pizza makes me throw up it just tastes so fake yk
Answer:
Explanation:
causes of vomiting in adults include: Viruses (gastroenteritis, aka “stomach flu”) and bacteria (food poisoning). Overindulgence (drinking too much alcohol or smoking too much marijuana). Medical conditions (pregnancy, motion sickness, migraines, vertigo).
Given that almost all organisms obtain energy from food by the process of cellular respiration, which is the most likely explanation for what prevents Earth from running out of oxygen? A. The net effects of the reactions of photosynthesis and cellular respiration are the opposite of one another, therefore the products of one are the reactants of the other, creating a cycle. B. The energy flow—and thus oxygen flow—for cellular respiration and photosynthesis take place in the same direction, and therefore build upon one another. C. Cellular respiration is a process that releases energy and oxygen, while photosynthesis withdraws energy and uses oxygen, therefore keeping each process in balance. D. Oxygen readily accepts electrons, so cellular respiration uses a negligible amount of oxygen.
Answer:
a
Explanation:
ther are many explanation
One of the key elements in creating a green economy is the construction of ________________.
a.
green buildings
c.
solar panels
b.
a new tax system
d.
a new workforce
Answer:
A One of the key elements in creating a green economy is the construction of green buildings.
Explanation:
Any economy relies on businesses and buildings, so a green economy is going to need green buildings to support a green economy as well.