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djyliett [7]
3 years ago
13

Determine if the statement is true or false, and why. “If a point mutation occurs in a proto-oncogene it can form an oncogene. T

his can stimulate excessive cell division, leading to the formation of a tumor.”
Biology
1 answer:
UNO [17]3 years ago
5 0

Answer:

<u><em>The above statement is true.</em></u>

Explanation:

A proto-oncogene can be described as a gene which is normal but if mutation occurs then it can be converted into a cancerous gene. Proto oncogenes have different functions to perform. Some of them act as signals for cell division while others might be involved in the process of apoptosis. A point mutation can be described as a mutation by which just a single nucleotide gets changed. Even a change in the single nucleotide can cause a proto oncogene to convert into an oncogene and cause cancer.

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The diploid number of chromosomes in the mustard plant, Arabidopsis thaliana, is 10. Knowing this, answer the following question
lukranit [14]

Answer:

10 chromosomes/sister chromatids

Explanation:

Prophase is the first stage of cell division (mitosis). Prior to the cell entering the actual division stage, it undergoes a phase where it prepares its content and most importantly undergo the duplication of its genetic material (DNA). This DNA are found as chromosomes. It undergoes replication of its DNA in the S-phase of interphase stage.

Since Arabidopsis thaliana has 10 chromosomes, and each chromosome holds one DNA molecule, 10 molecules of DNA will be present in the mustard plant's genome. These 10 molecules of DNA will be replicated on another copy of chromosome which is identical to the template. This chromosomes are called SISTER chromatids i.e. replicated chromosome. Each sister chromatids are held together at the centromere and are considered one individual chromosome until they separate during anaphase stage.

Hence, at the Prophase stage, before separation, each sister chromatid (replicated chromosome) is considered as one chromosome. Thus, in the mustard plant with 10 chromosomes, it will possess 10 sister chromatids or chromosomes at the Prophase stage.

N.B: When sister chromatids separate during anaphase stage, they will be regarded as individual chromosomes.

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Propose an explanation for why operons evolved in prokaryotes. what advantage do organisms have when they group genes together w
astra-53 [7]

Operons afford the organism the opportunity to simultaneously regulate transcription of multiple genes, whose products are active in the same process.  Operons lead to the synthesis of groups of functionally related enzymes, usually from a single mRNA transcript hence makes regulation of the genes highly efficient.






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