Answer: B- gymnosperms were originally the dominant, tall plant in the fossil record
Explanation:
Answer:
El elemento con alta electronegatividad es
Explanation:
El elemento con alta electronegatividad es
De los elementos del grupo principal, el flúor tiene la electronegatividad más alta (EN = 4.0) y el cesio la más baja (EN = 0.79). Esto indica que el flúor tiene una alta tendencia a ganar electrones de otros elementos con electronegatividades más bajas. Podemos usar estos valores para predecir qué sucede cuando ciertos elementos se combinan.
Answer: The phototropic response occurs because greater quantities of auxin are distributed to the side away from the light than to the side toward it, causing the shaded side to elongate more strongly and thus curve the stem toward the light
BE CAREFUL. Here we ask about the nucleolus precisely and not about the nucleus in general, the precise role of the nucleolus is to assemble the ribosomal RNA and the ribosomal proteins to form the ribosomes. So the answer is B.
In cell biology, the nucleolus is the largest nucleus subcompartment of eukaryotic cells. This particular space of the nucleus is not delimited by a membrane, nevertheless some authors consider it as an organelle and others do not. The number of nucleoli can vary during the cell cycle (usually only 1 in G0 phase).
The nucleolus is composed of proteins, DNA and RNA and is formed around particular chromosomal regions called NOR (Nucleolar Organizing Regions).
It is in particular the place where the transcription of the ribosomal RNAs (5.8S, 18S and 28S rRNA), the processing of these ribosomal RNAs from precursors and the first part of the assembly of the two ribosome subunits takes place. with the association of certain ribosomal proteins. The end of the ribosome assembly occurs in the cytoplasm on mRNA after export of pre-ribosomes through the nuclear pore.
Answer:
Matthias Schleiden, Theodor Schwann, and Rudolf Virchow are the contributors of cell theory.
Explanation:
Matthias Schleiden and Theodor Schwann formulated the cell theory in 1839 after studying tissues. They said that cell is the basic unit of life, new cells are formed from the old cells through cell division and all living things are made up of one or more cells. Matthias Schleiden, Theodor Schwann, and Rudolf Virchow are the three scientists who made important contribution to cell theory.