Answer:
D.
Explanation:
Answer:d
Explanation:
Scientists have noticed that the entire DNA molecule has the same width, despite the fact that the four nucleotides are NOT the same width Now that you’ve created a model, explain why this makes sense (hint: it has to do with the number of rings for each nitrogen base)
I don't have access to your model, although I'm sure it's beautiful. Fortunately, this question can be answered without one.
A strand of DNA is a polymer consisting of monomeric nucleotide units. The nucleotides that are found in DNA are distinguished by their nucleobases: adenine (A), thymine (T), guanine (G), and cytosine (C). Each nucleotide in DNA is made up of a single nucleobase, a sugar (deoxyribose), and a phosphate group. These nucleotides form extremely long chains comprising phosphate-sugar linkages (covalent, phosphodiester bonds).
In native, double-stranded DNA, you have of these chains (or strands) arranged side-by-side such that the nucleobases on one chain are faced directly across corresponding nucleobases on the other chain, which enables hydrogen bonding between the bases.
There is a "rule" regarding which bases form hydrogen bonds with one another (Chargaff's rule): adenine with thymine and guanine with cytosine.
What does this have to do with the width of the DNA molecule?
The four nucleotides can be structurally classified into two categories: pyrimidines and purines. For our purposes, we only need to know that pyrimidines are six-membered rings and purines are a fusion of a six- and five-membered ring (basically, purines are pyrimidines attached to a five-membered ring). Thymine and cytosine are pyrimidines, and adenine and guanine are purines.
So, geometrically, adenine and guanine are larger (and, thus, "wider") than thymine and cytosine since adenine and guanine contain an extra ring. But remember our base-pairing rules: In native DNA, adenine (two rings) on one strand pairs up with thymine (one ring) on the other strand, and guanine (two rings) pairs up with cytosine (one ring) on the other strand.
Because there's a 1:1 ratio between A:T and G:C in double-stranded DNA, the DNA molecule consists of complementary base pairs that, in any given composition of, has equivalent widths. Put simply, the A=T pair has the same width as a G≡C pair because both base pairs are between one pyrimidine and one purine.
DNA (Deoxyribonucleic acid) is composed of four nucleotides, namely, adenine, guanine, cytosine, and thymine.
Adenine and guanine are purines while Cytosine and thymine are pyrimidines.Purines are composed of two rings while pyrimidines are composed of only one ring.Purine forms bond with pyrimidine, i.e Adenine binds with thymine and guanine binds with cytosine.Adenine and thymine form two hydrogen bonds while guanine and cytosine form three hydrogen bonds.Thus, the relative pairing of the purine and pyrimidine with each other keeps the width of the DNA constant.
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while all zebras have stripes, no two zebras share the same stripe pattern
Answer:
correct?
Explanation:
What best explains why, in early spring, ice remains longer on Lake Erie than on the surrounding land areas when the air temperature is above freezing?
Answer:
Because the water-specific heat is much higher than land specific -heat.
Explanation:
When water solidifies due to the temperature descent, it forms hydrogen bridges between water molecules, separating them from each other. This is the reason for water expansion during the freezing process. To go back to the liquid state, and break down the hydrogen bridges, too much heat is needed. This means that water has high water-specific heat.
Water-specific heat is the amount of energy in the form of heat needed to raise the temperature of one gram of water one degree Celsius.
Due to its high specific heat capacity, water reduces the temperature changes. For instance, when we are at the river or sea, during sunset, it gets colder because the sun is not heating directly the earth anymore. However, if we touch the water it seems to be warmer. This is because the water calorific capacity is about five times higher than the sand calorific capacity. The land gets colder faster than the water.
In the same way, when a water body such as a lake is frozen, and there is also ice on the land surface surrounding the lake, and the environment rises its temperature, first the ice on the land defrost and then, after a certain lapse of time, the ice of the water surface also defrosts.
Explain why DNA is important to life on Earth.
Answer: Deoxyribonucleic Acid (DNA) is the basic building blocks of life on earth.
Explanation: DNA contains all kinds of genetic information in which the cell uses as instructions for the new organism. DNA makes up what traits the offspring will inherit. This is upto and including diseases, birth defects, eye color, learning disabilities, chemical imbalances (yes, depression is a chemical imbalance and therefore can be inherited). DNA controls many aspects of your daily life without you even knowing it.
What phases do cells go through during meiosis?
Explanation:
Since cell division occurs twice during meiosis, one starting cell can produce four gametes
hope this helps
A chemical which consists of just one kind of atom is always:
a molecule
an element
a mineral
a rock
Which of the following is NOT a man-made activity that increases the atmospheric heat?
A. burning
B. deforestation
C. dumping waste
D.reforestation
Answer:
D is the answer okkkkkkkkkkkkkkkk
Please help me I can’t fail please fast
Answer:
C
Explanation:
Spores are single-celled and seeds have multiple cells
Awarding 50 points and brainliest answer
Label the microscope!
A
B
C
D
E
F
G
A- stage clip
B- coarse focus
C- objective lens
D- stage
E- Condenser + Diaphragm
F- condenser focus
G- Light source/Mirror
Why enzymes of bacteria are not destroyed while the enzymes of plant destroyed at 78 C
Answer:
i need more information to answer this
Explanation:
Answer:
the enzymes in the bacteria are more heat tolerant
Explanation:
which statement correctly describes how the amount of ofoxygen in the earth’s atmosphere has changed over time?
Answer:
Based on the relative volumes of the gases in Earth’s atmosphere, nitrogen is actually more than 3 times more than oxygen. Because the troposphere is the lowest atmosphere layer, it contains 75 percent of the atmosphere’s mass.. From largest to smallest, Earth’s atmosphere composition contains nitrogen, oxygen, argon, CO 2 and trace gases.
Explanation:
Select the best answer for the question.
3. In an offspring set, there are two organisms with lobed ears (LI) and two organisms with unlobed ears (II). What is the likely genotype and
phenotype of the unknown parents?
Note about the question:
Options are missing in the problem statement, and I failed in finding them. However, here is my answer and explanation.
Answer:
• Genotype: Ll and ll
• Phenotype: One parent has lobed-ears (Ll) and the other one has
unlobed-ears (ll)
Explanation:
Due to technical problems, you will find the complete answer and explanation in the attached files
If RrYy is crossed with another organism with the genotype RrYy, what would be the expected phenotypic ratio of
the F1 generation
Explanation:
TRICKY Q.
ACCORDING TO ME:
P1 ---> RrYy n RrYy
F1 ----> RY , RY , ry , ry hence 1:1:2:2
IN DIHYBRID CROSS
PHENOTYPIC RATIO : 9:3:3:1 FOR F2 GENERATION
GENOTYPIC RATIO : 1:2:2:4:2:2:1:1:1 FOR F2 GENERATION
GOOD LUCK FOR FUTURE! :)
Conclude: An organism that breaks down organic matter into simpler materials (like carbon dioxide) is called a decomposer. Decomposers absorb nutrients from living things or the organic matter they leave behind. They do not need to kill to get their food.
Do your results suggest bears are decomposers? Explain your reasoning.
Answer:
No, because bears kill to get their food. They eat fish and they kill the fish to get them. If they left the fish carcass, decomposers would eat it. The bear makes the food for the decomposers, but it is not a decomposer itself... Does that make sense?
why does animal viruses affect only animal but not to the plants?
Explain the difference between homology and analogy using a wolf, a whale, and a shark:
Answer:
Explanation:
Analogy refers to traits or structures like body shapes, fins which evolved independently that are similar in organisms that are not related by the same common ancestor. For example dolphins and shark have similar body structures like fins but they are unrelated. Whale and shark too. Whales are mammals, sharks are fish.
Homology refers to traits or structures
posses by organisms that are related by common ancestors. Example wolf and whales.....they are both mammals.
Choose one other region. Describe how that area will be affected by climate change
Answer:
When the global temperature changes, the changes in climate are not expected to be uniform across the Earth. In particular, land areas change more quickly than oceans, and northern high latitudes change more quickly than the tropics, and the margins of biome regions change faster than do their cores.
I hope it's helpful!
Haploid sperm and egg are produced via meiosis. What process is responsible fro producing the 2N zygote?
A. Differentiation
B. Fertilization
C. Replication
D. Transcription
Answer:
Explanation:poda
Answer:
c
Explanation:
4. In which layer do most (90%) of rainforest organisms live?
A. Emergent layer
B. Canopy layer
C. Understory
D. Forest Floor
If the concentration of sugar is 1% OUTSIDE the cell and 5% INSIDE the cell, which of the following will occur by osmosis?
water will move out of the cell
sugar will move out of the cell
sugar will move into the cell
water will move into the cell
Answer:
the answer is water will move out of the cell
When a cell exits the cell cycle and no longer goes through cell division, the cell enters into the __________________ phase.
Answer:
Anaphase
Explanation:
It is what it is
Which of the following structures within the chloroplast absorb light energy for photosynthesis?
A. Photosystems I and II, predominantly photosystem I
B. Thylakoids, predominantly grana
C. Photosystems I and II, predominantly photosystem II
D. Chlorophyll, predominantly chlorophyll a
Answer:
Photosystems i and ii, predominately photosystem ii
Explanation:
I did the test
the remains of once-living organisms are called what
please help me with this homework question!
Answer:
Tt and tt
Explanation:
To solve this just work backwards. The first box has Tt so one parent has to have T and the other t. Since the tall plant is on the top, it is T_ and t_. Next use the second box (tt). They are both t so the final answer is Tt x tt.
When blood is flowing through a vena cava, which main blood vessel will it flow through next?
A hepatic portal vein
B hepatic vein
C pulmonary artery
D pulmonary vein
Answer:
C.
Explanation:
When the ventricle is full, the tricuspid valve shuts. This prevents blood from flowing backward into the right atrium while the ventricle contracts.
As the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs, where it is oxygenated.
when does a seed become a seedling?
a. when it has roots
b. when a flower forms
c. when photosynthesis begins
d. when a stem forms
Answer:
when the photosynthesis begins
PLEASE HELP(this question has been asked a lot of times by other people with no good answers.)
1. Which of the following statements about classification of organisms is true?
A: Phylogenetic classification uses genetics and ancestral relationships to classify organisms.
B: The Linnaean system of classification takes into account ancestral relationships between organisms
C: Linnaeus concentrated on the genetic characteristics of organisms to classify them.
D:In phylogenetic classification, the group that organisms are put into is called a taxon.
Answer:
Phylogenetic classification uses genetics and ancestral relationships to classify organisms.
Explanation:
took the test
The correct option is (a) Phylogenetic classification uses genetics and ancestral relationships to classify organisms.
Phylogeny classifies species based on evolutionary kinship or evolutionary distance (taxonomy). The degree and type of evolutionary distance between organisms determines their phylogenetic connection. Let's define taxonomy in order to better comprehend this idea.The connection between classification and phylogeny?The study and comparison of traits as well as the comparison of groups of organisms are the foundations of both phylogeny and categorization. However, there is a distinct feedback between character interpretation and inferred phylogeny, which is seen in the weighting of the characters used to construct the classification.
Learn more about classification and phylogeny brainly.com/question/16452940
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4. Why does semen contain fructose?
A. Fructose breaks down to provide energy for the penis.
B. Fructose travels with the sperm to feed the egg before it is fertilized.
C. Fructose feeds sperm, enabling them to survive long enough to fertilize an egg.
D. Fructose provides energy for the development of the fertilized egg.
I’ll give brainiest:)
Answer:
The answer is C
Explanation:
I just got it right on the quiz
Fructose feeds sperm, enabling them to survive long enough to fertilize an egg.
Semen contains fructose because it feeds the sperm, enabling them to survive long enough to fertilize an egg. Therefore, the correct answer is option C.
What is fructose?Fructose is a type of sugar that provides energy to the sperm as they travel through the female reproductive tract in search of an egg to fertilize. Sperm have a limited lifespan outside the male body, so it is essential that they are supplied with enough energy to reach and fertilize an egg before they die.
The fructose in semen provides this energy to the sperm, allowing them to survive and swim towards the egg. Once inside the female reproductive tract, the fructose is absorbed by the sperm and used to fuel their movement towards the egg. Without the fructose in semen, the sperm may not have enough energy to reach the egg and fertilize it.
Learn more about semen, here:
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PLEASE HELP i need this fast i will give BRAINLIEST
Answer:
1 is
Explanation:
no. 1 is water cycle
no.2 is food chain
no.3 is carbon-oxygen cycle
no.4 is mineral cycle
Which type of organism would MOST likely benefit directly from increased levels of CO2?
- fish
- bird
-tree
- mushroom
Answer:Im pretty sure its a tree or mushroom
Explanation:
The study of microorganisms is called microbiology.
The correct answer to the question is option D which is mushroom.
What is anaerobic respiration?Anaerobic respiration is respiration using electron acceptors other than molecular oxygen.Although oxygen is not the final electron acceptor, the process still uses a respiratory electron transport chain.According to the question, the fungi are saprotrophic species and an increased level of CO2 will help them to grow.
Hence, the correct answer is option D.
For more information about anaerobic respiration, refer to the link:-
https://brainly.com/question/14688752