Explain how the backbone of DNA is constructed from nucleotide building blocks.

A. DNA's backbone is not constructed from nucleotide units.

B.Nucleotide building blocks use covalent bonds to attach to one another at their sugar and phosphate ends.

C. Nucleotides use hydrogen bonds to attach themselves to the backbone.

D. Nitrogen bases use hydrogen bonds to attach to one another across the center of the molecule.

Answers

Answer 1

Answer:

B

Explanation:


Related Questions

Terrence likes to eat morel mushrooms, which are native to Georgia. How do the kingdoms to which humans and morels belong DIFFER? How are they SIMILAR?

Answers

Answer:

Mushrooms are in kingdom Fungi and humans are in kingdom Animalia

Explanation:

These two kingdoms are similar in that they are both in Domain Eukarya, meaning they have eukaryotic cells (have a nucleus, membrane bound organelles, are relatively large and organized). Both are also heterotrophic, meaning they eat other organisms to get energy. They are different in that fungi cells have cell walls made of chitin while animals do not have cell walls. Fungi tend to live pretty sedentary lives, and while that is true for some animals, that is not true of most. Fungi are also decomposers while animals are consumers.  

which is not characteristic of mammals

(A) hair covering
(B) 3 chambered heart
(C) produce milk
(D) produce sweat

Answers

Answer:(C) produce milk

Explanation:

Answer:

I guess it is (B) 3 chambered heart

why do you think there is so much life on our planet ?

Answers

Answer:

Earth's atmosphere and surrounding supports life.

Explanation:

The oxygen, nitrogen and carbon that's abundant on Earth promotes life.

Our atmosphere is made up of oxygen, nitrogen, and carbon dioxide which are elements that help us survive.

Plants can help prevent erosion or contribute to erosion. Which describes how plants could contribute to erosion?



a
Plant roots grow in rocks, breaking the rocks.
b
Plants break the impact of raindrops before they hit the soil.
c
Plants slow the runoff of water and soil.
d
Plant roots hold the soil in place against wind.

Answers

Answer:

a

Explanation:

the others ones described plants helping to stop erosion

Answer:

The Answer is A

Explanation:

Plant roots grow in rocks, breaking the rocks.

Plants take in carbon dioxide from the atmosphere.
Figure 2 shows part of the carbon cycle.
Describe how carbon from the atmosphere is cycled through living organisms.

Answers

Answer:

Carbon enters the atmosphere as carbon dioxide from respiration and combustion. Carbon dioxide is absorbed by producers to make glucose in photosynthesis. ... Decomposers break down the dead organisms and return the carbon in their bodies to the atmosphere as carbon dioxide by respiration.

Explanation:

hope it helps

How does an amoeba breathe

Answers

Answer:

Amoebas have a semirigid layer of ectoplasm which absorbs oxygen from the surrounding water and eliminates carbon dioxide in a form of respiration.

Explanation:

hope this helps

If a mutation helps an offspring survive and reproduce, the mutation can become an____ in future generations.
PLZ I NEED HELP ASAP HELP ME PLZ . 10 POINTS WHOEVER ANSWERS PLZ , I NEED REAL ANSWERS AND DONT RUSH.!!!!!!!!!!

Answers

Answer:

An adaptation

Explanation:

If the mutation has a positive effect on the fitness of the offspring, it is called an adaptation.

Which of the following describes a state of equilibrium?

Answers

Answer:

the condition of a system when neither its state of motion nor its internal energy state tends to change with time.

or b partially

What is artificial selection? How is the development of different dog breeds an illustration of artificial selection?

Answers

Answer:

Artificial selection is  process in which humans select the traits in animals and plants and use animal breeding or plant breeding to produce the animal or plants with desired traits.

Different dog breeds is very good example of artificial selection because with the help of artificial selection humans can  drastically alter the appearance of dogs. With artificial selection human can develop Great Dane from the tiny Chihuahua.

Answer:

When humans breed animals for a specific trait.

Explanation:

Ap Ex

What kind of symptoms do some human papillomaviruses cause?

Answers

Answer:

In most cases, HPV goes away on its own and does not cause any health problems. But when HPV does not go away, it can cause health problems like genital warts and cancer. Genital warts usually appear as a small bump or group of bumps in the genital area.

Explanation:

Mark me as brainliest please

Answer:

genital warts and genital cancer

Explanation:

Select the correct answer.
What is true about the current extinction rate?
A.
It’s slower than the earlier mass extinction rate.
B.
It’s primarily attributed to human intervention.
C.
It’s attributed to natural environmental changes.
D.
It’s necessary for evolution.
E.
It’s affecting few species.

Answers

Answer:

its b

Explanation:

Extinction is primarily attributed to human intervention. So, the correct option is B.

What is Extinction?

The extinction is defined as the end of a particular type of organism or a set of types, typically a species. Although the ability to reproduce and bounce back may have been lost earlier, the death of the last member of the species is usually considered as the moment of extinction.

Extinction is the term used to describe the extinction of an entire species. In that it has allowed for the emergence of new species and the ascent of others, extinction has both advantages and disadvantages. Since most species have been driven to extinction by human activity, humans have had a significant impact on the pace of extinction. The main cause is thought to be human activity.

Therefore, the correct option is B.

Learn more about Extinction, here:

brainly.com/question/1048615

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Explain how matter cycles throughout this food web. Where do the atoms/molecules travel?
plz help!

Answers

Eating other animals from producers and consumers for energy and matter moves from the nitrogen, water,and carbon cycle

Our traits come from ______material.

Answers

genetic
since we are made from our dna

Answer:

Genetic

Explanation:

Seafloor spreading happens mostly under the sea except in

Answers

Elaborate more if u need an answer
I’m pretty sure Mountain ranges hope this helps

A student wanted to see if covering a leaf in foil would stop it from producing starch. Why should the student put the plant in a dark cupboard for 48 hours before returning it to the light and starting the experiment?

1. To make the results reliable
2. So that the plant would photosynthesise faster when returned to the light
3. So that any starch already in the leaf was used up by the plant
4. He did that simply

Answers

Answer:

4.) He did that simply

Explanation:

I'm just guessing it's 1 because the other answers don't seem reasonable

Answer:

Putting the plant in dark for 48 hours would stop the process of photosynthesis as light is required for it. Photosynthesis produces organic sugars which are stored in form of starch in plants. The absence of photosynthesis would lead to the consumption of all stored starch making the leaf starchless. The correct answer is option D.

Explanation:

Can you guys please help me I will mark you brainelest if you get 2-5 answers right
2. What is a convergent boundary? Name one example of a convergent boundary.

3. What is a transform boundary? Name one example of a transform boundary.

4. Using the map provided, where are convergent boundaries typically found on the earth (middle of oceans or near edges of continents)?

5. Using the map provided, where are divergent boundaries typically found on the earth (middle oceans or near edges of continents)?

Answers

Explanation:

2. A convergent boundary is an area on earth where two or more lithospheric plates collide. The Oregon-Washington coastline is an example of this boundary.

3. A transform boundary is a fault along the plate boundary where the motion is predominately horizontal. An example of this is the Alpine Fault in New Zealand.

1pt Place the following steps in the correct order:
1. Sperm nuclear envelope breaks down
2. Genomes blend to form a diploid cell
3. Decondensation occurs
4. Sperm head penetrates egg cytoplasm.

Answers

Answer:

The delivery of the paternal genome to the egg is a primary goal of fertilization. In preparation for this step, the nucleus of the developing spermatozoon undergoes extensive morphological and biochemical transformations during spermatogenesis to yield a tightly compacted sperm nucleus. These modifications are essentially reversed during fertilization. As a result, the incorporated sperm nucleus undergoes many steps in the egg cytoplasm as it develops into a male pronucleus. The sperm nucleus (1) loses its nuclear envelope, (2) undergoes nucleoprotein remodeling, (3) decondenses and increases in size, (4) becomes more spherical, (5) acquires a new nuclear envelope, and (6) becomes functionally competent to synthesize DNA and RNA. These changes are coordinate with meiotic processing of the maternal chromatin, and often result in behaviors asynchronous with the maternal chromatin. For example, in eggs fertilized during meiosis, the sperm nucleus decondenses while the maternal chromatin remains condensed. A model is presented that suggests some reasons why this puzzling behavior exists. Defects in any of the processes attending male pronuclear development often result in infertility. New assisted reproductive technologies have been developed that ensure delivery of the sperm nucleus to the egg cytoplasm so that a healthy embryo is produced. An emerging challenge is to further characterize the molecular mechanisms that control sperm nuclear transformations and link these to causes of human infertility. Further understanding of this basic process promises to revolutionize our understanding of the mystery of the beginning of new life.

Explanation:

The delivery of the paternal genome to the egg is a primary goal of fertilization. In preparation for this step, the nucleus of the developing spermatozoon undergoes extensive morphological and biochemical transformations during spermatogenesis to yield a tightly compacted sperm nucleus. These modifications are essentially reversed during fertilization. As a result, the incorporated sperm nucleus undergoes many steps in the egg cytoplasm as it develops into a male pronucleus.

Primary source of energy

Used for movement cell defense, cell structure, communication, and cell regulation

Composes the outside of the cell membrane

Carries hereditary information

Pair each structure with its function:
*Nucleic acid
*Protein
*Lipid
*Carbohydrate
*Water

Answers

Answer:

Despite differences in structure and function, all living cells in multicellular organisms have a surrounding cell membrane. Just as the outer layer of your skin separates your body from its environment, the cell membrane (also known as the plasma membrane) separates the inner contents of a cell from its exterior environment. This cell membrane provides a protective barrier around the cell and regulates which materials can pass in or out.

Structure and Composition of the Cell Membrane

The cell membrane is an extremely pliable structure composed primarily of two layers of phospholipids (a “bilayer”). Cholesterol and various proteins are also embedded within the membrane giving the membrane a variety of functions described below.

A single phospholipid molecule has a phosphate group on one end, called the “head,” and two side-by-side chains of fatty acids that make up the lipid “tails” (Figure 3.1.1). The lipid tails of one layer face the lipid tails of the other layer, meeting at the interface of the two layers. The phospholipid heads face outward, one layer exposed to the interior of the cell and one layer exposed to the exterior (Figure 3.1.1).

This diagram shows the structure of a phospholipid. The hydrophilic head group is shown as a pink sphere and the two tails are shown as yellow rectangles. This diagram shows a phospholipid bilayer. Two sets of phospholipids are arranged such that the hydrophobic tails are facing each other and the hydrophilic heads are facing the extracellular environment.

Figure 3.1.1 – Phospholipid Structure and Bilayer: A phospholipid molecule consists of a polar phosphate “head,” which is hydrophilic and a non-polar lipid “tail,” which is hydrophobic. Unsaturated fatty acids result in kinks in the hydrophobic tails. The phospholipid bilayer consists of two adjacent sheets of phospholipids, arranged tail to tail. The hydrophobic tails associate with one another, forming the interior of the membrane. The polar heads contact the fluid inside and outside of the cell.

The phosphate group is negatively charged, making the head polar and hydrophilic—or “water loving.” A hydrophilic molecule (or region of a molecule) is one that is attracted to water. The phosphate heads are thus attracted to the water molecules of both the extracellular and intracellular environments. The lipid tails, on the other hand, are uncharged, or nonpolar, and are hydrophobic—or “water fearing.” A hydrophobic molecule (or region of a molecule) repels and is repelled by water. Phospholipids are thus amphipathic molecules. An amphipathic molecule is one that contains both a hydrophilic and a hydrophobic region. In fact, soap works to remove oil and grease stains because it has amphipathic properties. The hydrophilic portion can dissolve in the wash water while the hydrophobic portion can trap grease in stains that then can be washed away. A similar process occurs in your digestive system when bile salts (made from cholesterol, phospholipids and salt) help to break up ingested lipids.

15. There are 23 gamete cells in
Your answer:
Meisois
O Cytokineisis
Mitosis

Answers

Answer:

Mitosis

Explanation:

The term haploid can also refer to the number of chromosomes in egg or sperm cells, which are also called gametes. In humans, gametes are haploid cells that contain 23 chromosomes, each of which a one of a chromosome pair that exists in diploid cells.

After mitosis, the daughter cell has 20 chromosomes and after meiosis, the daughter cell has 10 chromosomes.

Explanation:
Mitosis is part of cell replication. The cells formed during mitosis are called diploid, because they have the same number of chromosomes as the parent cell.
Meiosis is a type of cell division which produces gametes. These gametes are haploid cells because they have half of the number of chromosomes as the parent cell.

Conduction can only occur between two objects when –

Answers

Answer:

Conduction can only occur between two objects when -

one object is less dense than the other. both objects are in physical contact with each other.

What is the definition of the word Transformation

Answers

Answer:

significa el resultado de un proceso de cambio de forma. Sucede cuando una cosa, hecho o idea es convertida en otra.

Explanation:

Transformation: a thorough or dramatic change in form or appearance. like transferring to a better person changing in a good way

The change in leaf color on these trees is one way the trees maintain what

Answers

photosynthesis
The process is called photosynthesis. When chlorophyll breaks down, yellow pigments in leaves become visible. As days get shorter and colder in the autumn, chlorophyll molecules break down.

Mark brainliest?

Oil is primarily used for...

A. Cooking/Home uses
B. Electricity
C. Transportation
D. Industrial uses
help me please please​

Answers

Answer:

A

Explanation:

Gas is a type of oil so if it’s not A than you should try C

Which organisms are both heterotrophic and autotrophic?​

Answers

Answer:

Pitcher Plant ( venus fly trap) has both autotrophic and heterotrophic mode of nutrition. They can prepare their own food like any other plant.

Explanation:

Answer:

Cyanobacteria

Explanation:

This type of bacteria is a heterotrophic and autotrophic organism. They exhibit photoautotrophic nutrition.   Sorry for the wait, I had to do some research about this.

                                                      -Aslina

If a device is removed from one loop in a parallel circuit, the other devices are not affected and can still flow through them.

Answers

Answer:

yes it still can flow through i hope that helped you

Explanation:

Answer:

Yes

Explanation:

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Answers

Answer:

Du kannst ich bekomme nur die Kerze und ich werde dir die Kerze besorgen und ich spiele sein sein und und werde

Which is greater concentration in normal air, the concentration of oxygen gas or carbon dioxide gas?

Answers

Explanation:

The concentration of oxygen in air is about 500 times higher than CO2, but oxygen is about 50 times less soluble.

The Punnett square predicts the ratio of genotypes in the offspring, based on the genotypes of the parents. The Punnett square below examines the chance of offspring having freckles, which is a dominant trait.

A Punnett square is shown. The columns are labeled Upper F and f. The rows are labeled Upper F and f. Clockwise from upper left the boxes contain: Upper F Upper F, Upper F f, Upper F f, f f.

Based on the Punnett square, what is the probability that the offspring will have freckles?
25 percent
50 percent
75 percent
100 percent

Answers

Answer:

75%

Explanation:

Three of the boxes contain an Upper case F, therefore 75% of the boxes have an Upper case F. It's like quarters, if you have 4 quarters you have 100 cents, if you have 3 you have 75 cents, if you have 2 you have 50 cents, and if you have 1 you have 25 cents.

Answer:

C.) 75 percent

Explanation:

True or false: Glucose the food of plants .

Answers

Answer:

True

Explanation:

Plants use the energy of the sun to change water and carbon dioxide into a sugar called glucose. Glucose is used by plants for energy and to make other substances like cellulose and starch.

Changes in weather are caused by the movement and interaction of _______ ______________. What should I fill the blanks in with?

Answers

Answer:

Air masses

Explanation:

An air mass is a volume of air defined by its temperature and water vapor content. Air masses adapt to the characteristics of the surface below them.

Other Questions
Please help! No fake answers please.There are 15 pieces of fruit in a bowl and 6 of them are apples. What percentage of the pieces of fruit in the bowl are apples?a. 0.06%b. 0.4%c. 6%d. 40% graph 4x minus 2y equals 10 pls answer, show work A jacket at a clothing store is being discounted by 10%. If the jacket was originally priced at x dollars, which of the following expressions does NOT represent the final price of the jacket before sales tax is added? A. x 0.10x B. x(1 0.10) C. x 1.10x D. 0.90x HurryA few years ago the population of male blue moon butterflies on the island of Samoa declined. One hypothesis for the decline of the male butterflies is that a parasite infected the cells of female butterflies. The parasite was passed to offspring through the females eggs and killed the male butterfly embryos. At one point during the decline, nearly all the butterflies in the population were females, but after five years the number of males in the population increased significantly.Which explanation most likely accounts for the increase in the number of male butterflies in the five years after the initial parasite problem?Male butterflies in the population that survived were able to prey on the parasites living in the females egg cells.Female butterflies in the population that survived had a genetic adaptation that allowed them to transform into male butterflies.Male butterflies in the population that survived had a gene that made them resistant to the parasite, and they passed the gene on to their offspring.Female butterflies in the population that survived were able to protect the male eggs from the parasite and provide extra care for the male offspring. An aluminum ion has 13 protons, 14 neutrons, and 10 electrons. What is the charge of the aluminum ion? Why were steamboats an improvement over earlier forms of transportation,such as horses and wagons?O A. They required less power to operate.O B. They cost more to operate.O C. They could carry fewer people.O D. They could carry more goods. If C = x2 + 8x + 3 and B = x 8, find an expression that equals 3C + B instandard form. helpppppppppppppppppppppppppppppppppppp meeeeeeeeeeeeeeeeeeeeeeeeee pleaseeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee What country is to the north of Costa RicaO PerO GuatemalaNicaraguaO Panam Why havent some countries been able to effectively respond to or prevent the spread of disease?A.Governments refuse to recognize there is a problem. B.Governments blame the disease on visiting tourists. C.Government and economic instability has led to improper use of funding. D.Governments do not believe that the drugs work well on African patients. the product of (2h+5)2 what is the first , middle ,and last term Which element is a noble gas? pls help!! What are some facts about Jackie Robinson? qu recorre 120 kilmetros tarda en viajar desde la entrada hasta la entrada de Nueva Granada ambas en la zona oriental sobre la carretera panamericana en direccin a San Miguel 3 minutos Qu distancia hay entre la entrada de estanzuela si la Nueva Granada What completes the diagram below? 6. In a population of angiosperms in Hardy-Weinberg equilibrium, the allele, C, conferring red flowers is completely dominant to the allele, c, causing white flowers. If allele C is at frequency 0.7 in the population, what is the expected frequency of red flowered plants Hannah and her friend are training to run in a 2-mile race. On Monday, Hannah ran mile. On Tuesday, she ran mile farther than she ran on Monday. a. How far did Hannah run on Tuesday? b. If her friend ran mile on Tuesday, how many miles did the girls run in all on Tuesday? 3(7 2y) = 9Please help. You have to solve it using distributive property. Thank you. 10 x 5 / 2 x 4533432 DON'T USE CALCULATOR AND SHOW YOUR WORK OR NO BRIANLEST SOLVE PLEASE!!!A. If a person bikes .24 miles in 1 minute, how far can he bike in 90 minutes? B. A store sells notebooks at 2 for $4.72. Mrs. Johnston needs to buy 11 for her 3rd period class. How much will she have to pay for all of them. Please solve a AND b BOTH OF THEM THEN YOU'LL GET 100 points plus the drown.