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Let's list the given options alphabetically to choose the appropriate answer.

One reason cancer cells are easier to culture than normal cells extracted from an organism is that ________. Group of answer choices

A. cancer cells grow in a more regulated fashion.

B. cancer cells do not need to adhere to a substratum to grow.

C. nutrient requirements for cancer cells are precisely defined.

D. cancer cells are better models for demonstrating what happens in an intact organism

Answer:

B.

Explanation:

Cancer cells are easier to culture in comparison to normal cells because cancer cells do not need to adhere to a substratum to grow.

As cancer cells are uncontrolled growth of cells and they do not require any substratum to grow and can easily grow to a culture while a normal cell require optimal conditions to grow in a culture.

Hence, the correct option is "B".

Answer:

10%

Explanation:

there is a the rule that only 10% of the energy is transferred from one trophic level to the other.

this means that only 10% of the food an organism eats  is passed onto the next organism. eg only 10% of the energy in a plant is transferred to a rabbit that eats the plant. After that if  a wolf eats the rabbit only 10% of the energy of food will pass on to the wolf.

Answer:

preexisting cells present in the air can grow in sterilized nutrient broth

Explanation:

Spontaneous generation, which is the theory that life can arise from nonliving matter, has long been believed to be the way living organisms develop. However, in 1858, a French scientist called Louis Pasteur disproved the theory of spontaneous generation.

Louis Pasteur conducted an experiment to show that it is the existing microorganisms in air that causes life to grow and not the air itself. Pasteur made use of a swan-necked flask, which contained a sterilized (by boiling) broth. The swan-necked flask was designed in such a way that it would allow air to enter but trap any airborne microorganism, preventing them from reaching the broth.

Hence, if it were truly air and not existing life organisms that caused life growth, organisms should begin to grow from the broth. He conducted another experiment where be broke the neck of the flask to allow the entry of microorganisms into the sterilized broth and found out that growth of microorganisms occured on the broth.

Therefore, Pasteur, via his experiment was able to prove that preexisting cells present in the air can grow in sterilized nutrient broth if allowed entry but when there is no entry, there would be no life growth. This experiment disproved the theory of spontaneous generation.

Answer:

the scientist is studying an ecosystem

Answer:

D

Explanation:

Answer:

The best explanation for this difference is that the humus contained micronutrients needed by the plants for the synthesis of chlorophyll, such as Manganese (Mn), Iron (Fe) and Copper (Cu).

Explanation:

Chlorosis is the yellowing of plant leaves, and this is due to the deficiency in the amount of chlorophyll contained in the plant leaves. Iron (Fe) is an essential micronutrient for the synthesis of chlorophyll, which is an enzyme-catalyzed reaction. Copper (Cu) is a component of most enzymes, while Manganese (Mn) is a cofactor, required for the activation of the enzymes that catalyze chlorophyll synthesis, hence deficiency of these nutrients will result in the development of chlorosis.

Answer:

primary waves

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Answer:

Answer:

The type of erosion described in the question is called Water Erosion.

Explanation:

Note that the erosion is caused by winter and spring rains.

Water Erosion can happen when raindrops disintegrate the aggregates of the topsoil. The fragments collect into the soil pores and create a coagulating action which makes it difficult for the water to penetrate the soil. The rainwater having increasingly accumulated on the surface flows off along with the topsoil.

This type of erosion can be further aggravated if:

Cheers!

Answer:

this is because they appear dead outside and alive inside beings

Answer:

the cell membrane is an extremely pliable structure composed primarily of back -to- back phospholipids (a "bilayer")

Answer:

Food and plants!

Answer:

(In explanation)

Explanation:

 The heat from the earth's core causes convection currents in the air under the earth's crust, causing the tectonic plates to shift/ move.

Eye color is an example of Gene expression

Answer:

C. The population moves onto a large, raised, flat area called a plateau for protection from predator.

Explanation:

The plateau phase of population growth indicates that the population has stopped growing as the environment has reached its carrying capacity.

The population after going through different phases eventually reaches the plateau phase where the growth of the population stops or become constant. This is the outcome of the natality rate becoming equivalent to the mortality rate.

This occurs as the resources in the environment become less or scarce as well as there is an elevation in predators and parasites. These are considered as limiting factors to the growth of population. This makes the population number relatively stable. With the limitation in the resources it can be said that the environment has attained its carrying capacity.

Thus, the correct statement is option D.

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Answer:

To activate the process of germination.

Explanation:

Answer: photosynthesis breaks down glucose. Hope you understand

Explanation:

Photosynthesis is related to Cellular (aerobic) Respiration in that they are equal but opposite reactions and the correct option is option B.

Photosynthesis and cellular respiration are complementary processes that are crucial for the energy flow in ecosystems. In photosynthesis, plants and some bacteria use sunlight to convert carbon dioxide and water into glucose and oxygen. This process stores energy in the form of glucose.

In cellular respiration, organisms, including plants and animals, break down glucose and other organic molecules in the presence of oxygen to release energy for cellular activities. This process consumes glucose and oxygen and produces carbon dioxide and water as byproducts.

Photosynthesis and cellular respiration are interconnected through the exchange of products and reactants. The oxygen produced in photosynthesis is used in cellular respiration, while the carbon dioxide produced in cellular respiration is used in photosynthesis. As a result, they form a continuous cycle that maintains the balance of oxygen and carbon dioxide in the atmosphere and provides energy for living organisms.

Thus, the ideal selection is option B.

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Answer:

streamlined bodies in dolphins and ichthyosaurs

Hope this helps! （づ￣3￣）づ╭❤～

Answer:

Cell membrane encloses all the cell organelles.  In prokaryotes, membrane is absent and so membrane-bound cell organelles are also absent.

Significance of membrane can be explained with the help of viruses, as viruses lack cell membranes and that is why they require a host for living and uses the host's cell machinery to multiply.

Hence, cell membranes are important for living organisms to live and perform essential biological processes.

Answer:

Carbon dioxide

sunlight

oxygen

chlorophyll

water

Hope this helps u

Answer:

d. none of the above

Explanation:

Energy, which refers to the ability to do work, can exist in different forms. The process of changing energy from one form to another is called TRANSFORMATION OF ENERGY. In an ecosystem, all organisms require energy in order to perform their life processes. They acquire these energy in different forms and convert it to a usable form by their cells (chemical energy) in ATP.

For example, solar energy in Sunlight is used by plants to drive their photosynthetic process and change it to chemical energy in glucose. Also, predators and herbivores feeding on herbivores and plants respectively converts one form of energy to another. Hence, all options are examples of energy transformation. None of the above is the correct answer.

Answer:

I think the correct answer is d ,

because all of them are an example of energy transforming in an ecosystem.

Hope this helps you guys!!!!!!

Answer:

Phototsynthesis takes water, sunlight, and CO2 and turns it into O2. Cellular Respiration take nutirents and O2 to create ATP.

Answer: there are no specimens on the slide

The best answer about the space exploration activity that has helped astronomers determine the age of the solar system is :  Collection of Lunar rock samples ( option 1 )

There are several exploration activities in which astronomers partake when they visit the solar system and they include :

But to determine the age of the solar system, collection of rock samples is the best activity, because rocks (one of the first substances found in the solar system )  are as old as where they are found.

Hence the space exploration activity that has helped astronomers determine the age of the solar system is the collection of lunar rock samples

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Answer:A

Explanation:Collection of lunar rock samples will help understand the moon more than the other options.

Answer:

Explanation:

An endangered species is one with a reduced population. These species can easily become extinct if all the remaining members die.

Answer:

Hypothalamic-Pituitary-Gonadal Axis

GnRH produced by the hypothalamus stimulates the production of both LH and FSH. FSH functions by stimulating ovarian follicular development in females and regulating spermatogenesis in males. LH induces ovulation and corpus luteum formation in the ovaries.

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hope this helped

Answer:

[tex]\Huge \boxed{3}[/tex]

Explanation:

Significant figures include non-zero digits and in between zeros.

2    0   .   8

20.8 has 3 significant figures.

Answer:

[tex]\huge\boxed{3 \ significant \ figures}[/tex]

Explanation:

There are 3 significant figures in

 2   0   .   8

According to the rules of significant figures:

=> All non-zero digits are significant.

=> Zeroes that come between 2 non-zero digits are also significant.

So, 3 significant figures in the term 20.8 cm.

Answer:

DNA mutation causes a change in the amino acid sequence for hemoglobin, which causes a change in the shape

Explanation:

Sickle cell mutation is a mutation that affect the production of red blood cell that is needed for the transport of oxygen in the bloods stream.

sickle cell mutation is a result of change in the amino acid which are building blocks of the protein hemoglobin.

The protein is what gives red cells their color, it has two subunits. The alpha

and beta subunit. There is a change in the arrangements of amino acid sequence and that is the basis for the sickle cell shape, beta subunit has valine an amino acid at position 6 instead of the glutamic acid. This alteration results in sickle cell problems that occur in people.

Answer:

Explanation:

From the options:

The DNA mutation increases the number of amino acids in hemoglobin, which causes a change in the shape of red blood cells.

The DNA mutation causes a change in the amino acid sequence for hemoglobin, which causes a change in the shape of red blood cells.

The DNA mutation decreases the number of amino acids in hemoglobin, which causes a change in the shape of red blood cells.

O The DNA mutation prevents formation of hemoglobin, the absence of wirich causes a change in the shape of red blood cells.

The correct answer would be that "The DNA mutation causes a change in the amino acid sequence for hemoglobin, which causes a change in the shape of red blood cells. "

The sickle-cell anemia is caused by a change in the amino acid sequence of the hemoglobin - specifically, as a result of the substitution of the sixth amino acid, glutamic acid, by valine in the beta subunit of the proteins that make up the hemoglobin. A single base substitution causes glutamic acid to be changed to valine.

The normal hemoglobin is disc-shaped and is able to effectively carry oxygen in the blood, unlike the sickle-cell hemoglobin which has the sickle shape and is not able to effectively carry oxygen in the blood.

The purpose of the Synthesis (S) phase of the cell cycle is the duplication of DNA. The correct option is D.

A cell cycle is a process of dividing a cell into two cells. It is a four-stage process that includes increasing the cell, diving the DNA, and the ready for cell dividing and then dividing into two cells.

The S phase is the synthetic phase. The phase includes duplication of DNA and dividing of DNA. During cell division or DNA replication, this process occurs.

So, all other statements are false, in the S phase, the DNA duplicates in the nucleus and the cell will ready to duplicate for cell division and mitosis. It is one of the processes of cell division or DNA replication.

Thus, the correct option is D. Duplication of DNA.

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Answer:

B. 1/2 and 1/4

Explanation:

Hemophilia is a rare disease that has to do with the inability for blood to clot. It is inherited on the X chromosome, hence, it is said to be X-linked. It is usually passed from mother to son. According to this question;

X - unaffected X chromosome

x = X chromosome affected by hemophilia

Y = Y chromosome

Therefore, in a cross between a Xx female (carrier) and a XY male (unaffected), the following chromosomes will be present in the gametes produced by each parent:

Xx- X and x gametes

XY- X and Y gametes

Using these gametes in a punnet square (see attached image), offsprings with genotypes: XX, Xx, XY and xY will be possibly produced.

XX (1) - unaffected female

Xx (1) - unaffected but carrier female

XY (1) - unaffected male

xY (1) - affected male (have hemophilia)

Based on the questions;

- 2 out of the possible 4 children will have the affected chromosomes i.e. both xY son and Xx daughter have the affected (x) chromosome. Hence, the fraction is 1/2

- 1 out of the 4 possible children is affected by hemophilia, which is the xY son. Hence, the fraction is 1/4.

Answer:

The fluoride is what helps you avoid cavities

Explanation:

water fluoridation as safe and effective in preventing tooth decay for both children and adults