Answer:
Scientists believed DNA was the molecule encoding for hereditary information due to the presence of makeup material inside in it.
Explanation:
The Hershey–Chase experiments which was conducted in 1952 indicate that DNA contains genetic material which has all the information about the makeup of living organism. DNA molecule has all information of making proteins and produces proteins which are necessary for the normal functioning of body of living organism. DNA molecule is just like a recipe book which contains all information of making protein.
In a rabbit, B is the allele for a black coat and b is the allele for the brown coat, what is the genotype of a brown coat
A)bb
B) Bb
C) BB
The correct answer is A) bb
Explanation:
In genetics, an allele is a variation of a gene, which often determines a physical trait. Alleles are classified as dominant if they express even when there are other alleles or as recessive if two copies of the same allele are needed for the gene to express. Moreover, in genetics dominant alleles are represented by uppercase letters while recessive alleles are represented by lowercase letters.
In this context, the allele that is responsible for the brown coat in rabbits is a recessive allele, considering this is represented by lowercase b. This means two copies of the allele are necessary for the rabbit to have a brown coat and therefore the genotype of a brown coat is bb. Also, others such as Bb and BB have the dominant allele related to the black coat, and therefore will lead to rabbits with a black coat.
Which molecular formula corresponds to this model of a chemical compound? (black = carbon; red = oxygen; white = hydrogen) A ball-and-stick model has two black balls bonded to each other at center, with single-bonded red balls bonded to white balls above left and below right, and double-bonded red balls above right and below left. C2(OH)4 C2H2O4 C2H4O2 C4H2O2
Answer:
C2H2O4
Explanation:
The molecular formula corresponds to this model of a chemical compound is to be considered as the C2H2O4.
Molecular formula:Since
Two black balls (C) bonded to each other at the center = C2
And,
Single-bonded red balls (O) bonded to white balls (H) above left and below right = (OH)2 = O2H2
And,
Double-bonded red balls above right and below left = O2
So if we add this
So it comes
= C2 + O2H2 + O2
= C2H2O4
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The illustration below shows the steps of meiosis I.
The steps of meiosis 1 are shown. In step A, the chromosomes pair up. In step B, the homologous pairs line up for separation. In step C, the pairs are separated. In step D, sister chromatids stay together. In step E, 2 new cells are formed.
What is the step that is labeled D?
metaphase I
metaphase II
telophase II
telophase I
Answer:
Telophase I
Explanation:
Meiosis is a kind of cell division employed by sexually-reproducing organisms to produce gametes. It involves the production of four daughter cells (gametes) that each have a reduced number of chromosomes as the parent. Meiosis occurs in a two step division (meiosis I amd II), that involves four major steps each viz: Prophase, Metaphase, Anaphase, and Telophase
In meiosis I, homologous chromosomes (similar but non-identical chromosomes received from each parent) are involved in the steps.
Prophase I- Homologous chromosomes pair up to form a TETRAD structure called synapse. This describes step A
Metaphase I- Homologous chromosomes line up at the cell's equator in order to be pulled apart by spindle microtubules. This describes step B
Anaphase I- Homologous chromosomes are pulled apart to opposite poles of the cell. This describes step C.
Telophase I- Each homologous chromosome consist of two sister chromatids, which remain together in opposite cells. This describes step D
Step E described Cytokinesis, which is the separation of the cell into two daughter cells.
Hence, step D is the Telophase I stage.
Answer:
telophase I
Explanation:
Use the following information to answer the following question(s).The dune-burrowing spider Seothyra sp. lives in the Namib desert on the southwestern coast of Africa. These spiders build silk-lined burrows with a sticky silk mat at the entrance to trap insect prey. While foraging during the day, the spider remains concealed in its burrow and shielded from direct sunlight when prey are not present.During the day, environmental temperatures vary from 17 to 73°C (63-164°F). If a spider is prevented from retreating into its burrow, it shows signs of thermal stress at 49°C, whereas unrestrained spiders continue to forage at temperatures above 65°C. In addition, spiders respond more quickly to prey stimuli during the hottest times of the day and capture prey in significantly less time when temperatures are above 49°C. The captured arthropods (prey) tend to succumb more quickly to hot surface temperatures; they are more lethargic and struggle less when captured at the high temperature ranges.1. Based on the information in the paragraphs, spiders are ______.a. endothermsb. ectothermsc. sometimes ectotherms and sometimes endothermsd. neither ectotherms nor endotherms2. In animals, individual cells are grouped into _____.a. organismsb. organsc. organ systemsd. tissues3. A main function of most types of epithelial tissue is ______.a. supportb. absorptionc. sensationd. covering surfaces4. Reabsorption is the movement of substances from the ______ to the ______a. blood... filtrateb. kidney... urinary bladderc. blood... nephrond. filtrate... blood5.In humans, goosebumps are a vestige of a mammalian adaptation related to ______.a. thermoregulationb. water conservationc. positive feedbackd. osmoregulation
Answer:
spiders are. generally ectotherms.Their internal temperature depends on external temperature transfer.They are also poikilothermic because the body temperature varies with that of the external environment.,
In animals, individual cells are grouped into tissues. e,g Blood. The tissues gives rise to organs.
A main function of most types of epithelial tissue is covering surfaces.They line major all hollow surfaces, and covering body surfaces.
Resorption id the movement of fluid from the glomerular filtrate back into the blood. Ions, glucose,and other escaped metabolites are returned to the blood stream.
In humans, goosebumps are a vestige of a mammalian adaptation to thermoregulation. This is a thermoregulatory mechanism to regulate the body temperature,Goosebumps emits heat, to turn the moisture from the skin to vapour. This evaporate to release this moisture, which cools the body.
Explanation:
define ecological pyramid and indicate the limitations of ecological pyramid
Answer:
Ecological pyramid is a graphical representation showing the biomass or bioproductivity at each trophic level in a given ecosystem.
Limitations
The ecological pyramid does not take into account the same species belonging to more than one trophic level.
Fire and Mello conducted an experiment where they added no gene X RNA (b), anti-sense gene X RNA (c) or double stranded gene X RNA (d) to C. elegans embryos. They then did a hybridization experiment examining gene X mRNA levels in the embryo. Imagine this experiment was a protein X western blot (using an anti-X antibody) instead of a hybridization experiment. Describe the expected results.
If this experiment was a protein X western blot (using an anti-X antibody) instead of a hybridization experiment then:-
The targeted proteins will be detected with the help of anti-X antibody.There will be no blocking of m- RNA called the phenomenon of RNA interference.What was Mello and Fire experiment?They detected that double-stranded RNA can silence genes that this RNA interference is specific for the gene whose code matches that of the injected RNA molecule.The RNA interference can spread between cells and even be inherited.To know more about RNA interference here
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What have a heart but doesn’t beat
Answer:
The King of Hearts in Deck of Cards is the answer to this riddle
Explanation:
Which of the following IP address format is correct?
O A. 192.165.2.1
B. 123:211:2:1
C. 192,168, 2,1
D. 192;165;2;1
Answer:
The answer is A.
Explanation:
An IP address is a series of four numbers separated by periods.
Salmon are bony fish (teleost) that spend considerable portions of their lives in the ocean. In this environment, values of salmon plasma osmolarity are about 300 mosm. As they swim about in the ocean, which statement is true?
A. There will be no net force to drive water either into or out of the fish.
B. There will be a net pressure for water to enter the fish.
C. There will be a net pressure for water to flow out of the fish.
D. Osmotic pressure will first force water into the fish, and then with time flip and force water out of the fish.
E. Pressures will first force water out of the fish, and then with time flip and force water into the fish.
Answer:
B. There will be a net pressure for water to enter the fish.
Explanation:
Salmon are born in fresh water and migrate to oceans for most of their life. They maintain homeostasis through the process of osmoregulation, where salmon control osmosis to maintain a water balance in ocean.
The salt water is hypo-tonic to their surroundings so the water molecules move out of the body cells as a result of osmosis and salmon dehydrates. Then the hormones of salmon help to adapt the condition and their will be a net pressure for water to enter the fish.
Hence, the correct option is B.
20 words about body, health, or disease.
thermometer measures air temperature. The second thermometer
has a wet bulb. As water evaporates from the wet bulb, its
temperature decreases relative to the air temperature.
1. Do you think the wet bulb will cool down more on a dry or humid day?
how will the lever of carbon in the atmosphere change if humans do nothing to reduce their impact on the carbon cycle
Answer: The amount of carbon dioxide will keep on increasing in the atmosphere because there are various sources by which it can be released into the environment. The burning of fossil fuel, emission from vehicles, gases released from industries contributes to the increase in amount of carbon dioxide in environment.
Explanation:
what is echolocation
Answer:
The location of objects by reflected sound, in particular that used by animals such as dolphins and bats.
Explanation:
Answer:
When you use sound to find things because the sound bounces back of the object
Dolphins use it
what enhances the satability of mRNA
Answer:
Promoter Strength
Explanation:
More than increasing mRNA stability, the promoter strength can be tuned to increase the gene expression by producing more quantities of the mRNA. The strength is based on efficient promoter recognition and rapid binding of the DNA polymerase.
hope it helps : )
Answer:
Promoter Strength
Explanation:
A promoter is a DNA sequence that can recruit transcriptional machinery and the sequence promoter is what determines the strength of the promoter ( a strong promoter leads to a high rate of transcription initiation).In regards to mRNA stability, the promoter strength can be tuned to increase the gene expression by producing more quantities of the mRNA. The tuning of promoter strength is based on efficient promoter recognition and rapid binding of the DNA polymerase.
Using the biological species concept as your guide, sort the following observations based on whether they support the notion that the Big Bird lineage is a separate species or whether they refute the notion that it is a separate species.
Supports separate species: Big Bird males hold territories in and around territories of other species but breed only with Big Bird females. Big Birds have their own unique call. There is no gene flow in or out of the Big Bird populationRefutes
Separate Species: big bird can vreed with G fortis females
Answer:
According to the biological concept of species, this statement confirms that the Big Bird lineage is a separate species.
Explanation:
The biological species concept states that species are groups of organisms capable of interbreeding and producing fertile offspring. Ernst Mayr (1970) literally stated that "species are groups of interbreeding natural populations that are reproductively isolated from other such groups". This statement is consistent with the lack of gene flow and reproductive isolation. In consequence, the biological concept of species is supported by above described, i.e., Big Bird males breed only with Big Bird females.
You can read this book:
Mayr, E. (1970). Populations, species, and evolution: an abridgment of animal species and evolution (Vol. 19). Editorial: Harvard University Press.
The_ of the cell directs cell activity and acts like the control center.
Answer:
Nucleus
Explanation:
The Nucleus is the central and most important part of an object, movement, or group, forming the basis for its activity and growth.
Answer:
nucleous
Explanation:
itacts like the control center
The chemical equation below summarizes cellular respiration. 6O2 + C6H12O6 à 6CO2 + 6H2O + energy The energy that is released by cellular respiration is in the form of dark energy. solar energy. nuclear energy. chemical energy.
Answer: chemical energy
Explanation:
I did the test
Answer:
chemical energy
Explanation:
edg 2020
The defining trait of hominins is
Answer:
Their erected pose, bipedal locomotion, broader brains and behavioural characteristics, such as specialised language communication, are some characteristics that distinguish hominins from other primates, both living and ended.
Explanation:
Answer is above
Hope this helps.
Answer: Some characteristics that have distinguished hominins from other primates, living and extinct, are their erect posture, bipedal locomotion, larger brains, and behavioral characteristics such as specialized tool use and, in some cases, communication through language.
Explanation:
New technologies could improve conditions for all societies. However,
priorities are different in different parts of the world. Which is the most
important goal of technology in societies in the United States and Europe?
O A. Developing new sources of clean drinking water
O B. Designing artificial habitats for use in space exploration
O C. Producing more food for a growing population
O D. Treating the diseases of an aging population
How do scientists know when life began?
Which of the following wrap around neurons and speed up signals
Explanation:
myelin sheath ..........
Excluding plasma, which state of matter has the most kinetic energy?
Answer:
Gas
Explanation:
Gas has the most kinetic energy.
Gas has the most energy than the solid ones.
Three states of matter
1: solid
2: liquid
3: Gas
Hope this helps.
Can someone help me with this 3 questions please
Answer:
- the answer for the exercise 6 is water
- the answer for the exercise 7 is population
- the answer for the exercise 8 is ecosystem
Which is inference? You measure A plants height every day for a week-you give a plant the same amount of water every day-every day for a week you collect data on a plants movement- After watching a plant for a week, you determine it needs more sunlight
Answer:
After watching a plant for a week, you determine it needs more sunlight
Explanation
Inference is a conclusion so you concluded the plant needs more sunlight.
I contain cytoplasm
Answer:
Cytoplasm is Located inside the cell between the nucleus and the cell membrane.
Which spheres would feel volcanic eruptions and earthquakes?
Answer:
All spheres feel the effect of a volcanic eruption and earthquake
Explanation:
The spheres considered include the lithosphere, biosphere, atmosphere, hydrosphere and anthroposphere. Volcanic eruptions result from the movement of molten magma from below the earth crust either gently or in an explosive form while earthquakes are caused by the seismic movement of waves in the earth crust resulting in intense shaking. The lithosphere is where both the volcanic eruption and earthquake are triggered. This usually results in damage to the earth crust and damage the surface of the earth crust as well called the mantle. The biosphere made up of plant and animals is usually destroyed by both earthquakes and volcanic eruptions due to being swallowed up below the ground as well as the release of toxic gases from below that can affect their chances of survival. The atmosphere made up of the gases in and around the clouds and air we breathe become polluted, visibility becomes impaired and life unbearable as a result of volcanic eruptions and earthquakes. The hydrosphere made up of water body is seriously affected as pollutants such as toxic substances from the magma and even waste are brought to the surface to contaminate our source of livelihood and survival which is water. Pollutants in the air are also washed into water bodies when it rains. The anthroposphere made up of humans and their activities on the earth surface are severely impacted by volcanic eruption and earthquakes. Scenes of building collapse, molten magma killing humans and destroying buildings will be too much to bear. There will be no food as agriculture will be severely impacted hence making human survival nearly impossible.
What happens when a sodium atom loses an electron in its outer energy
shell?
A. It has an increase in the number of neutrons.
B. It has an increase in the number of protons.
C. It becomes a negative ion.
D. It becomes a positive ion.
Answer:
Sodium will let that electron go as soon as it can, which is why it generally forms ionic compounds such as NaCl. When sodium atom loses an electron from its outer energy shell, it becomes Na+ ion. D is the answer
Explanation:
List ways to reduce your carbon footprint
Answer:
1. Utiliza menos la secadora de ropa
Los tendederos y los rack de secado son una opción amigable con el planeta. Las secadoras de ropa producen una gran cantidad de CO2, al no utilizarlas bajas tu consumo de electricidad (y la cuenta), dejas de producir dióxido de carbono y, además, tienes como aliado al mejor quitamanchas que existe: el sol.
2. Desconecta el cargador de tu celular
Aunque no estés usando el cargador, si lo dejas conectado sigue consumiendo energía y contribuyendo al cambio climático, por eso los llaman ?vampiros de energía?. Lo mismo pasa con el resto de tus aparatos si los dejas conectados: pantalla de TV, computadora, Blu-ray, DVD, etc. La mejor opción es comprar barras multicontacto, con estas podrás desconectar todas tus máquinas en un solo movimiento.
3. Mantén limpio tu refrigerador
El exceso de bolsas de plástico y empaques, así como mantener el congelador con hielo, hacen que tu aparato necesite más potencia para enfriar, y con ello se gasta más electricidad.
4. Saca la bicicleta
Muchos trayectos no justifican el uso del automóvil, ¿por qué no mejorar de paso tu salud recurriendo más a la bicicleta? (Considera también el transporte público).
5. Utiliza bolsas de tela cuando hagas el súper
Seguro esto ya lo sabías, pero uno de los mayores enemigos del medio ambiente el el uso excesivo del plástico, y usar cajas cartón o bolsas de tela al hacer el súper, es una medida necesaria.
6. Regresa al termo
Comprar botellas plásticas con líquido cada que tienes sed es poco amigable con el planeta, mejor compra un termo y lleva en éste tus bebidas. Un beneficio adicional es que podrás controlar mejor la calidad de los líquidos que ingieres pues los llevarás desde tu hogar, y no te arriesgarás con bebidas de dudosa calidad. Con el tiempo verás que el ahorro también será notable.
7. Reduce la ingesta de carnes
Ya se trate de cerdo, res o aves, el proceso para llevarlos a tu mesa gasta una gran cantidad de energía.
8. Mantén tu automóvil en buen estado
Si necesitas seguir utilizando tu coche, mantenlo en buen estado. Los autos con el mantenimiento adecuado, como las llantas infladas correctamente, generan menos emisiones de gases de efecto invernadero, además de que no te dejarán tirado en el camino.
9. Adopta plantas endémicas
Las plantas propias de la localidad donde vives no requieren demasiado uso de agua, y sus beneficios son mayores al absorber el CO2 del aire. Lo mejor sería que plantaras un árbol, pero si no cuentas con el espacio o las condiciones necesarias, puedes explorar algunas ideas alternativas como los jar
dines verticales.
10. Recuerda las tres erres
Busca tener presente siempre el significado de las tres erres y procura aplicarlas siempre que puedas: Reduce, Reutiliza y Recicla.
What is the basic unit of life
Technically this can be answered in a number of ways. But in elementary biology the cell is considered to be the basic unit of life.
The amoeba is a protozoan that moves with _____.
Answer:
Pseudopod
Explanation:
