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Stolb23 [73]
3 years ago
10

Which of the following is the main energy source for our sun?

Biology
1 answer:
Nostrana [21]3 years ago
4 0

Answer:

Nuclear fusion is the source of the sun's energy.

Explanation:

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_____ are made up of frozen volatile materials.
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The correct option for this problem is A. Comets.
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Conduction This is the way heat transfers through _______. When the particles near the heat source heat up up, they get more
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Answer:

solids

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2 years ago
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Using the data in Figure 13.2, translate the following DNA segment into an amino acid sequence: -TTTAGCGAGTCTCGA-
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Phe-ser-glu-ser-arg

T (thymine) should be translated into U (uracil)

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6 0
4 years ago
In the block to polyspermy, entry of the sperm's contents causes ________ levels in the oocyte's cytoplasm to rise, triggering t
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In the block to polyspermy, entry of the sperm's contents causes calcium ion levels in the oocyte's cytoplasm to rise, triggering the cortical reaction.

In biology, polyspermy describes the fertilization of an egg by more than one sperm. Diploid organisms normally contain two copies of each chromosome, one from each parent.

The cell resulting from polyspermy, on the other hand, contains three or more copies of each chromosome—one from the egg and one each from multiple sperm. Usually, the result is an unviable zygote. This may occur because sperm are too efficient at reaching and fertilizing eggs due to the selective pressures of sperm competition.

The cortical reaction is a calcium-dependent exocytotic process in which the content of secretory granules is released into the perivitellin space immediately after fertilization, which serves to prevent polyspermic fertilization.

Learn more about  polyspermy here : brainly.com/question/4537960

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8 0
1 year ago
¿Cómo explicaría Lamarck el origen y la expansión de estas bacterias resistentes? ¿Cómo explicaría
Anuta_ua [19.1K]

La teoría de la evolución de Lamarck se basa en la capacidad de los organismos para cambiar físicamente debido a las adaptaciones en su entorno para garantizar su supervivencia. Esto es evidente en la propagación de los determinantes de resistencia a los antibióticos entre las bacterias. La capacidad de las bacterias para desarrollar nuevos mecanismos de resistencia para sobrevivir a los antibióticos radica en su capacidad para adquirir genes que los ayuden a este respecto a través de la transferencia horizontal de genes y la adquisición de plásmidos. Mecanismos como bombas de eflujo y plásmidos les ayudan a sobrevivir en medio de antibióticos. Transmiten estos materiales genéticos a sus descendientes, lo que garantiza que continúen sobreviviendo y no se extingan a pesar de la presencia de antibióticos.

El dawrnismo claramente reclama la selección natural. Por lo tanto, si un organismo no evoluciona o adquiere características especiales para ayudarlo a adaptarse, competir y sobrevivir en su entorno, se extingue. Solo aquellos que adquieren estas habilidades sobreviven y se reproducen en el medio ambiente.

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3 years ago
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