How is the process of natural selection involved in evolution in biology?

1 answer:

6 0

The organisms who do better at surviving and reproducing will pass on more genes than those who don't. So those with better adaptations will survive more to pass on those genes.

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2 Points<br> Why is it important for scientists to state a conclusion?

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To compare their hypothesis to the data that they observed

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How are saturated and unsaturated fatty acids different

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They are distinct because saturated fatty acids have hydrocarbon chains connected by single bonds solely. Unsaturated fatty acids have one or more double bonds. Each double bond may be in a cis or trans configeration.

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Which trait can be passed from one generation to the next by genes? A. The ability to speak German B. Red hair color C. A broken

Thepotemich [5.8K]

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Red hair color

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Write components of xylem and phylem ?

aleksandrvk [35]

Xylem contains tracheids, vessels, xylem parenchyma and xylem fibre.

Tracheids: They are elongated, tubular dead cells with tapering end walls.
Vessels: These are also known as trachea. They are elongated, tubular dead cells. They are joined to each other by end to end forming a continuous pipe. The cells are thick and lignified.
Xylem parenchyma: They are also called wood parenchyma. This is the only living tissue of xylem.
Xylem fibre: They are dead cells with thick walled fibre.

Phloem consists of sieve tubes, companion cells, phloem parenchyma and phloem fibres.

Sieve tubes: These are elongated, tubular living cells arranged in a row, with their perforated end walls forming a sieve. They are non-nucleated. Their protoplasm are inter-connected through sieve plates. They possess vacuoles.
Companion cell: They are elongated, lens-shaped cells containing dense cytoplasm and prominent nuclei. These cells maintain connection with sieve cells through pits.
Phloem parenchyma: They are living thin walled parenchyma cells.
Phloem fibre: They are also known as bast fibre. They are elongated fibre like sclerenchymatous dead cells with thick walls containing pits and interlocked ends. Phloem fibre are the only dead cells in phloem.

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2 years ago

a sequence of amino acids called a blank is produced during the process of blank during this process, the blank of a TRNA molecu

eduard

Answer:

A transfer RNA (abbreviated tRNA and formerly referred to as sRNA, for soluble RNA is an adaptor molecule composed of RNA, typically 76 to 90 nucleotides in length,that serves as the physical link between the mRNA and the amino acid sequence of proteins. Transfer RNA does this by carrying an amino acid to the protein synthetic machinery of a cell (ribosome) as directed by the complementary recognition of a 3-nucleotide sequence (codon) in a messenger RNA (mRNA) by a 3-nucleotide sequence (anticodon) of the tRNA. As such, tRNAs are a necessary component of translation, the biological synthesis of new proteins in accordance with the genetic code.

Each mRNA molecule is simultaneously translated by many ribosomes, all reading the mRNA from 5′ to 3′ and synthesizing the polypeptide from the N terminus to the C terminus. The complete mRNA/poly-ribosome structure is called a polysome.

tRNAs in eukaryotes

The tRNA molecules are transcribed by RNA polymerase III. Depending on the species, 40 to 60 types of tRNAs exist in the cytoplasm. Specific tRNAs bind to codons on the mRNA template and add the corresponding amino acid to the polypeptide chain. (More accurately, the growing polypeptide chain is added to each new amino acid bound in by a tRNA.)

The transfer RNAs (tRNAs) are structural RNA molecules. In eukaryotes, tRNA mole are transcribed from tRNA genes by RNA polymerase III. Depending on the species, 40 to 60 types of tRNAs exist in the cytoplasm. Serving as adaptors, specific tRNAs bind to sequences on the mRNA template and add the corresponding amino acid to the polypeptide chain. (More accurately, the growing polypeptide chain is added to each new amino acid brought in by a tRNA.) Therefore, tRNAs are the molecules that actually “translate” the language of RNA into the language of proteins.

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