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Ber [7]
4 years ago
5

DNA and RNA are structurally similar but also have some notable differences. RNA has uracil in place of thymine as one of its ba

ses, uses ribose in place of deoxyribose, and
A. is a polymer of nucleotides and amines.
B. has a different phosphate group in its backbone.
C. often exists as a single-stranded molecule.
D. can't form base pairs.
Biology
2 answers:
ycow [4]4 years ago
5 0

Answer:

ANSWER: it is a single-stranded molecule

Explanation:

dolphi86 [110]4 years ago
5 0

i think it is A! .....

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Why are fossil fuels considered nonrenewable resources if they are still forming?
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a

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Fossil fuels are considered non renewable because they take millions of years to form but depleted faster than they are formed.

6 0
3 years ago
Leer el siguiente texto de las teorías evolutivas y expresar cuales son las principales semejanzas y diferencias
IceJOKER [234]

Answer:

Lamarck creía que la evolución era una consecuencia de la presión ambiental mientras que Darwin expresó que el mecanismo de evolución es la selección natural

Explanation:

Lamarck desarrolló una teoría en la que propuso que los organismos evolucionaban como una consecuencia de la influencia ambiental y que los cambios fenotípicos causados por el ambiente podía ser trasmitidos a través de generaciones. Por otra parte, Darwin desarrollo una teoría en la cual las especies evolucionan a través de un proceso que él denominó selección natural (supervivencia del más apto) : aquellos organismos mejor adaptados a su ambiente tendrán más chances de sobrevivir y de reproducirse, pasando sus genes a la siguiente generación. En relación al cuadro comparativo, Lamarck creía que las jirafas se adaptaban a su ambiente para sobrevivir, mientras que Darwin propuso que aquellas jirafas que mejor se adaptaban a un ambiente cambiante tenían más chances de sobrevivir. Lamarck también creía en la idea del uso y desuso de órganos: las jirafas con el tiempo podía desarrollar cuellos más largos estirándose para alcanzar las hojas de los árboles de copas más altas y transmitían esta característica a su progenie, mientras que Darwin propuso que aquellas jirafas con cuellos más largos tenían más chances de sobrevivir que las que tenían cuello corto (selección natural), y las jirafas de cuello largo transmitían este rasgo a su descendencia (descendencia con modificación). Lamarck creía en la idea que las especies no poseen un antecesor común, mientras  que Darwin creía que todo el árbol de la vida está conectado a través de antepasados comunes. Finalmente, Lamarck pensaba que las especies no podían extinguirse, mientras que Darwin propuso la idea que las especies se extinguen y surgen otras nuevas a través de procesos de radiación adaptativa.

4 0
3 years ago
HELP!!!!! which is a plant tissue???
kherson [118]
I think it’s leaf okkkkkkkkkkkkkkkkkkkkkk
6 0
3 years ago
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Frogs have lungs for breathing, but they also absorb dissolved oxygen directly through their skin. This allows respiration to oc
alukav5142 [94]

Answer: B. Water breaks down into oxygen molecules for respiration.  


Water is the required for photosynthesis, a process by which plants (terrestrial and aquatic) makes their food by utilizing water as a reactant to produce oxygen and glucose as product. The glucose act as a source of energy for conducting various metabolic processes in plants but oxygen is released in the air.

6CO_2\ \ \ \ +6H_2O\rightarrow\ C_6H_{12}O_6+6O_2\\carbon\ \ \ \ water\ \ \ \ \ \ \ \ glucose\ \ \ \ \ \ \ oxygen\\ dioxide

This oxygen is necessary for terrestrial and aquatic animals for respiration. Therefore, water breaks down into oxygen by the process of photosynthesis, hence water plays important role in respiration in living beings.  


5 0
3 years ago
Read 2 more answers
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