Based on DNA's structure and function, why did Meselson and Stahl
choose to grow E. coli in broths of nitrogen isotopes?
A. The bacteria's phosphate groups would be replaced by the
nitrogen.
OB. The nitrogen would be incorporated into deoxyribose.
C. The nitrogen would influence bonding between base pairs.
D. The nitrogen would be incorporated into the DNA
nucleotides

Answers

Answer 1

Answer:

Ecoli has certain istopyes in where the molecules such as carbon dioxide re introduces the carbon molecules therfore ecoli has certain phosphate groups.

Explanation:


Related Questions

PLEASE HELP !! ILL GIVE 40 POINTS ; PLUS BRAINLIEST !! DONT SKIP ANSWER.

Answers

I think the answer is A

20. Process through which pollutants get increasingly more concentrated each step up the food chain.
bloaccumulation
risk assessment
toxicity
biomagnification

Answers

Answer:

bioaccumulation of chemicals is the problem concerning all living organisms. This is the result of dynamic equilibrium between the uptake and elimination. The extent to which bioaccumulation occurs determines the toxic effects which are manifested. In some cases, the mechanisms of protection from certain undesirable substances deposited in special sites, to prevent their participation in the metabolic reactions, have evolved. The knowledge on bioaccumulation enables to assess the risk related with the presence of various chemicals in the environment, food, and at workplace and to present quantitatively the ability to control the use and emissions of chemicals.

A prospective groom, who is not affected by cystic fibrosis (CF), has a sister with cystic fibrosis, an autosomal recessive disease. Their parents are also not affected. The brother plans to marry a woman who has no history of CF in her family. What is the probability that they will have a child with CF? They are both Caucasian and the overall frequency of CF in the Caucasian population is 1/2500 - that is, 1 affected child per 2500 (assume the population meets the Hardy-Weinberg assumptions).

Answers

Answer: In punnett square number 1, we see the cross between AA and aa, and the result is 100% Aa individuals, so there is 0% chances of haveing a child with CF. In punnett square number 2, we see the cross between Aa and aa and there is 50% chances of having a child with CF (aa genotype).

p = 0.98

q = 0.02

p² = 0.9604

q² = 0.0004

2pq = 0.0392.

Explanation:

Due to technical difficulties, the explanation has been attached as a word document.

3.Some plants have structures or features that protect them from harm.

If a plant has bitter-tasting leaves, what would this most likely protect the plant against?Lector inmersivo
(1 Punto)

caterpillars that would eat the plant

cold weather that would cause the plant to freeze

people who would pick the plant for its pretty flowers

hot weather that would cause the leaves to dry up

Answers

Answer:

Caterpillars that would eat the plant

Explanation:

Specific immunity involves
actif
Pa
abs
both cell-mediated and antibody-mediated immunity
lysozyme found in sweat and tears
acti
or
MA
tior
724
surface barriers like skin, mucus and the cilia of the respiratory tract
cell-mediated immunity
O antibody-mediated immunity

Answers

Answer: both cell-mediated and antibody-mediated immunity.

Explanation:

Specific immunity involves targeting certain infections. This is done when certain cells assess the danger and release anti-bodies that target the antigens of the organism.

Once this is done, white blood cells will now be able to fight the organism or pathogen more efficiently.

There is therefore both a cell-mediated and antibody-mediated response.

In corn plants, the allele for tall stalks (T) is dominant over the allele for short stalks (t). Suppose a cross between a tall corn plant and a short corn plant produces 43 tall offspring and 47 short offspring. If one of the tall offspring is crossed with one of the short offspring, what ratio of genotypes would be most likely in their offspring

Answers

Complete question:

In corn plants, the allele for tall stalks (T) is dominant over the allele for short stalks (t). Suppose a cross between a tall corn plant and a short corn plant produces 43 tall offspring and 47 short offspring. If one of the tall offspring is crossed with one of the short offspring, what ratio of genotypes would be most likely in their offspring

A. 1 TT : 2 Tt : 1 tt

B. 3 Tt : 1 tt

C. All Tt

D. 1 Tt : 1 tt

Answer:

The offspring genotype ratio would be 1 Tt : 1 tt (Option D)

Explanation:

Due to technical problems, you will find the complete explanation in the attached files.

can you heat alcohol over an open flame. Give reason for your answer​

Answers

Answer:

No, you cannot. The problem is that alcohol fumes are flammable. If you heat over an open flame you risk igniting the fumes which will start a chain reactions.

Explanation:

ggl and knowledge

Indicate whether the given structure is located in the outer, middle, or inner ear. pharngotympanic tube helicotrema stapedius

Answers

Answer:

The pharngotympanic tube is in the middle ear.The helicotrema is in the inner ear.The stapedius is in the middle ear.

Explanation:

The ear has three main parts, the outer part, the middle part, and the inner part. The outer part of the ear starts in the auricle, then it continues with the auditory canal, and it finishes with the eardrum. Then we have the middle ear that is separated from the outer one with the eardrum. In this section, it is the pharngotympanic tube, also known as the Eustachian tube. It is a tube that connects the inner ear with the pharynx to regulate internal pressure.

The inner ear has the bony labyrinth and the membranous labyrinth. In this part of the ear, the mechanical signals are transformed into electrical signals. The bony labyrinth has the cochlea, the vestibule, and the semicircular canals. The helicotrema is in the cochlea, and it connects the tympanic duct with the vestibular duct.

The stapedius is a muscle located in the middle ear. Its insertion is in the stapes, a small bone that moves with the vibrations that come from the eardrum to the malleus and the stapes. The stapedius' function is to protect our hearing by reducing the vibrations that enter this part of the ear.

Which cell division phase is shown in the image?
A) telophase
B) metaphase
C) prophase
D) anaphase

Answers

Answer:

metaphase is the correct answer of this

Answer:

b is correct

Explanation:

ok ok ok ok ok ❤️❤️

???????????????,,,??,???? What is the answer to number 4 and 5

Answers

Answer:

Questions 4-snow and 5 is rain showers

PLEASE HELP !! ILL GIVE 40 POINTS ; PLUS BRAINLIEST !! DONT SKIP ANSWER.

Answers

Answer: yo what grade is u in for these people to give you advanced word like this and also the letters are too small for me to see so I can't solve it right away.

Explanation:

Answer:

B

Explanation:

What are the causes of soil compaction? (Site 1)

Answers

Answer:

Internal factors include particle-size distribution, organic matter content, mineralogy and water content of the soil. Externally applied forces are generally mechanically applied forces, the primary source of these being vehicular traffic

Explanation:

please answer !




will give brainliest

Answers

Answer:

c

Explanation:

Clouds can block light and heat from the Sun, making Earth's temperature cooler

what is the difference between sex chromosomes found in humna females and human males?

Answers

Answer:

Females have XX sex chromosomes while males have XY sex chromosomes.

Scientists conduct investigations to answer questions. Before making a valid conclusion, scientists must-
A- collect relevant evidence
B- tell people about the data
C- publish results from the investigation
D- discuss the investigation with other scientists

PLSSS HELPPPP

Answers

A- to collect relevant evidence

Which of the following statements correctly describes the relationship between erosion and deposition?

A.
Erosion breaks rocks into pieces, and deposition moves the pieces.

B.
Deposition and erosion both involve the movement of small pieces of rock from one place to another.

C.
Erosion is the movement of small pieces of rock from one place to another, and deposition is when the rock settles in a new location.

D.
Deposition and erosion break rocks into smaller pieces, but the rocks remain in place.

Answers

Answer:

I think It's A

Explanation:

I hope I helped :)

please help me it’s due in 20 minutes

Answers

Answer:

ok

Explanation:

1. p

2. n

3. n

4. p

5. n

6. p

7.p

8. n

HELP ME PLEASE ? Helppppppppppp

Answers

Let me get a quick answer

Certain prehistoric events led to the formation of oil. Which of the following was one of those events? A giant wind storms destroy forests. B glaciers melted at the north and south poles . C Life in the sea died and was buried under sediment. D heavy flooring soaked the earths crust.

Answers

Answer:

C oil is just dead animal remains

Explanation:

Answer: C

Explanation: ,

how is carbon captured and stored by organisms? how is carbon passed through the ecosystem? how is carbon returned to the ecosystem?​

Answers

Explanation:

i dont.know im in that qt


Carbon enters all food webs, both terrestrial and aquatic, through autotrophs, or self-feeders. Almost all of these autotrophs are photosynthesizers, such as plants or algae. Autotrophs capture carbon dioxide from the air or bicarbonate ions from the water and use them to make organic compounds such as glucose.

HOPE THIS HELPS

write one paragraph explaining the steps of photosynthesis

Answers

Plants and certain microorganisms use photosynthesis to create compounds such as carbohydrates. It's an endothermic (heat-inducing) chemical reaction that converts carbon dioxide to sugars using sunlight. Sugars are used by the cell as an energy source as well as a building block for other molecules. Photosynthesis takes place in two stages: light-dependent reactions and the Calvin cycle (light-independent reactions). Light-dependent reactions, which take place in the thylakoid membrane, use light energy to make ATP and NADPH.

Answer:

trading a lemonade stand for an orange juice stand!!! get a taste of ur own medicine HA

Explanation:

Pls help I’m failing

Answers

Answer:

C.

Explanation:

Not A. because it didn't mention that (and it's not true)

Not B. because that wasn't mentioned (and common sense tells you it incorrect)

C. because it was mentioned (differently) and it made perfect sense

Not D. because it didn't even talk about how many letters (or sounds) there was to be true (plus look at A. above)

4) What factors influence the circulation of the Earth's atmosphere,
thereby producing our weather?

Answers

The movement of air through Earth's -- or any planet's -- atmosphere is called wind, and the main cause of Earth's winds is uneven heating by the sun. This uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure

The uneven heating of the earth's surface is one of the main variables affecting the circulation of the atmosphere globally along with  seasonal variations in precipitation and temperature and Earth turning on its axis.

What is weather?

The state of the atmosphere is referred to as the weather, and can be described in a number of different ways, including the degree to which it is hot or cold, wet or dry, quiet or stormy, clear or cloudy. The troposphere, the lowest layer of the Earth's atmosphere, is where the majority of meteorological events take place. The stratosphere is the next layer up from the troposphere. The term "weather" is used to describe the temperature, precipitation, and other characteristics of the atmosphere on a day-to-day basis.

Variations in air pressure, temperature, and moisture from one location to another are the primary contributors to a day's weather. These disparities can be attributed to the fact that the angle at which the Sun is positioned at any given location varies with latitude. The vast temperature difference between the polar and tropical air masses is what gives rise to the biggest scale atmospheric circulations.

Learn more about weather, here:

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Question 3 of 10
A cell membrane is very specific about what it allows across. How does this
help the cell?
A. It helps the cell absorb as many different molecules as possible.
O B. The cell works better when it contains fewer proteins.
O C. Transport proteins allow only enzymes to pass through the
membrane.
D. It is better for the cell if most molecules are prevented from
entering
SUBMIT

Answers

Answer:

D

Explanation:

During which cell division phase does the nuclear membrane disappear?
A) telophase
B) metaphase
C) anaphase
D) prophase

Answers

Answer:

B)Metaphase

Explanation:

During metaphase, the nuclear membrane disappears and the chromosomes become aligned half way between the centrioles.

Answer:

Prophase

Explanation:

D

Fill in the blank with the appropriate word. ResetHelp The conducts impulses toward the soma. The conducts impulses toward the synaptic terminals. The is the region surrounding the nucleus. The is the enlarged end of an axon. The contains neurotransmitters. The is a cluster of RER and free ribosomes. The is another term for the soma of a neuron. The is the membrane of the axon. The is a cell that forms the blood 13brain barrier. The is a fine branch of an axon.

Answers

Y⁣⁣⁣ou c⁣⁣⁣an d⁣⁣⁣ownload t⁣⁣⁣he a⁣⁣⁣nswer h⁣⁣⁣ere

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Fill in the blank with the appropriate word as follows:

The dendrite directs electrical impulses toward the soma.The axon conducts impulses toward the synaptic terminal.The Perikaryon is the region surrounding the nucleus. The synaptic terminals ate the enlarged end of an axon.The synaptic vesicles contain neurotransmitters. The Nissl bodies are clusters of RER and free ribosomes.The Perikaryon or the cell body is another term for the soma of a neuron.The Axolemma is the membrane of the axon.The Astrocyte is the cell that forms the blood-brain barrier. The Telodendria is a fine branch of the axon.

What is a Neuron?

A neuron may be defined as a type of cell which is part of the nervous system. It sends messages to and from the brain. Neurons may also call neurons or nerve cells are the fundamental units of the brain and nervous system.

These cells are responsible for receiving sensory input from the external world, for sending motor commands to our muscles, and for transforming and relaying the electrical signals at every step in between.

Therefore, filling in the blank with the appropriate word is well described above.

To learn more about Neurons, refer to the link:

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45637456425637561457324751276567 x³+y³+z³=kf im homopfobic

Answers

what- ...... i’m so confused

Which fact supports the conclusion that goats are crucial to the international food supply?


Americans use milk from goats to make cheese.

Most of the world’s milk comes from goats.

The flavor of a goat’s milk varies by its breed.

Many Americans prefer cow meat to goat meat.

Answers

Answer:

blanks

Explanation:

Answer:most of the world’s milk comes from goats

Explanation:

Calcitriol is made from

Answers

Calcitriol is, strictly, the 1-hydroxylation product of calcifediol (25-OH vitamin D3), derived from cholecalciferol (vitamin D3), rather than the product of hydroxylations of ergocalciferol (vitamin D2).

in our body, what is the process of moving eliminating waste?

Answers

Answer:

Explanation:

Excretion is the process of removing wastes from the body. Organs of the excretory system include the kidneys, large intestine, skin, and lungs

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