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2 years ago

Which stage of MITOSIS is shown in the picture above?

Biology

1 answer:

Sphinxa [80]2 years ago

6 0

Answer:

Prophase

Explanation:

Prophase is usually the longest phase in mitosis,the chromatin threads condense to form distinct chromosomes,long and thin at first,later become shorter and fatter.

Each chromosome consist of a pair of chromatids held closely together at the centromere. Nucleolus disappears, nuclear membrane disintegrates, series of spindle (protein) fibres are formed spanning the cell from end to end. In cells where centrioles are present,they lie at each of the two spindle poles.

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How is meiosis different from mitosis.

Gemiola [76]

Answer:

the answer is b

Explanation:

at the end of meiosis, each gamite has two full sets of chromosones

7 0

1 year ago

Biochemical and genetic experiments have demonstrated that the _________ of tRNA are important for recognition by its cognate am

zvonat [6]

Answer: Acceptor stem and anticodon loop.

Explanation:

Transfer RNA (tRNA) is a small RNA nucleic acid involved in protein synthesis (translation). Each tRNA molecule has two important areas:

A region of trinucleotides, called the anticodon
A region where a specific amino acid binds.

During translation, the ribosome reads the sequence of the mRNA in groups of three bases to assemble the protein. So, in the mRNA chain there are codons, set of three bases, which determine the amino acid to be added to the peptide chain. The tRNA transfers the amino acid to the ribosomes, and then arranges them along the messenger RNA (mRNA) molecule. Then, the tRNA must have an anticodon that is complementary to the codon. Each type of tRNA is specifically combined with 1 of the 20 amino acids to be incorporated into proteins.

This means, during translation, each time an amino acid is added to the growing chain, a tRNA molecule is formed whose base pairs have a complementary sequence with mRNA molecule, ensuring that the appropriate amino acid is inserted into the protein. So, tRNA is a key link between RNA transcription and the translation of that RNA into protein. On the other hand, aminotransferases are enzymes responsible for attaching amino acids to the 3ʹ‐end of cognate tRNAs.

The acceptor stem is the site of attachment of amino acids to tRNA, and anticodon loop is the site of tRNA that is complementary to the codons found in mRNA (that determine the amino acid that will be added) This means, both parts are important for recognition, because the acceptor stem is where the amino acid is, and the anticodon loop ensures that the appropriate amino acid is inserted into the protein.

5 0

2 years ago

If the temperature of the ice-salt mixture decreases, why is the ice melting

LenKa [72]

Answer:

Salt lowers the freezing point of water via freezing point depression. ... When salted ice melts, the water can't refreeze as readily because the saline isn't pure water anymore and because the freezing point is colder. As more ice melts, more heat is absorbed, bringing the temperature down even lower.

Explanation:

Hope this helped, Have a Wonderful Day!!

3 0

2 years ago

In which location within the cell are epitopes bound to mhc class i proteins? view available hint(s) in which location within th

CaHeK987 [17]

The correct answer is endoplasmic reticulum.

Any nucleated cell contains MHC class I proteins which present cytosolic peptides. For example, during the intracellular microorganism infection such proteins are degraded in the proteasome, then degraded peptides are internalized in the endoplasmic reticulum and there associated with MHC-I molecules which are freshly synthesized. MHC-I/peptide complex is displayed on the cell surface and ready to interact with T lymphocytes.

8 0

2 years ago

During photosynthesis, the energy from sunlight is used to split water molecules. What happens to the hydrogen ions that are spl

wel

The answer is the last statement

7 0

2 years ago

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