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3 years ago

Explain the difference between chromosomes, chromatids and chromatin. (3-4 sentences)

Biology

1 answer:

Y_Kistochka [10]3 years ago

5 0

Answer:

A Chromosome is a long thread-like structure that are known to form the DNA molecule, and chromatid is one half of two identical copy of DNA. The two chromatids are joined together to form the chromosome. And chromatids are made up of a substance called as chromatin.

Chromosomes and chromatids are closely related to each other and both of them are made up of DNA molecules. Chromosomes carry the genetic material and chromatids form the DNA.

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The Punnett square shows the possible genotype combinations of two parents who are heterozygous for a particular trait.

forsale [732]

Homozygous is when the two letters are the same and dominance is represented by capital letters. There is one square that has two capital letter so 1/4 is equal to 25%. Hope this helps

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3 years ago

Read 2 more answers

Define these 3 terms: Isotonic Hypertonic Hypotonic

lisabon 2012 [21]

Answer:

Isotonic

denoting or relating to a solution having the same osmotic pressure as some other solution, especially one in a cell or a body fluid.

Hypertonic

having a higher osmotic pressure than a particular fluid, typically a body fluid or intracellular fluid

Hypotonic

having a lower osmotic pressure than a particular fluid, typically a body fluid or intracellular fluid.

Explanation:

4 0

3 years ago

What are the requirements for photosynthesis to occur, and what is the role of ATP in this reaction?

vesna_86 [32]

The answer is water, oxygen, and chemical energy are required, and ATP is changed to ADP.
Photosynthesis occurs in the leaves of green plants. During photosynthesis, carbon dioxide and water are converted into glucose and oxygen using the energy of sunlight. Sunlight energy is converted into chemical energy stored in carbohydrates. For this process, ATP is used and, thus, changed to ADP.

3 0

3 years ago

homestyler in the regulation of an organism's internal environment to maintain conditions suitable for life

galben [10]

The question is incomplete as the nature of question is not clear, however the correct question is as follows:

homeostasis is the regulation of an organism's internal environment to maintain conditions suitable for life. homeostasis requires....

Answer:

The correct answer is - Homeostasis requires balances between many factors in the body such as the body temperature, chemical and physical balance, pH etc

Explanation:

Homeostasis is the ability of an organism to regulate or maintain its internal environment or conditions according the condition require for survival of organism or cell.

It is the characteristic feature of living organisms and life to adapt or maintain the equilibrium of cell's chemical, physical environment.

Thus, the correct answer is - Homeostasis requires balances between many factors in the body such as the body temperature, chemical and physical balance, pH etc

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3 years ago

Question 4 1 pts

yan [13]

Answer:

1. Gene expression may be controlled by epigenetic mechanisms.

The base pair sequence of a gene is not solely responsible for the sequence of amino acids. A gene may have several allele/variants whose expression is controlled by multiple factors. Epigenetic processes such as DNA methylation, do not involve changes in the DNA sequence. Instead they influence the protein amino acid sequence by changes in the process of transcription or even translation.

2. The mutation introduced a stop codon into the middle of the mRNA molecule.

The protein will be shorter if the point mutation causes the creation of a stop codon in the interior of the mRNA strand. Thus, the remaining sequence after the mutation will no longer be used to create the rest of the protein.

3. Pre-mRNA is not edited, and is used as mRNA.

Because no introns and exons are included in the model, the pre-mRNA is not edited. During this step, the introns are removed from the DNA strand. However, due to the fact that the model does not define them and thus differentiate between them and the exons, the pre-mRNA will be used as mRNA.

4. The process of translation in the beetle is similar to other organisms, but involves a unique genetic code.

The processes of translation and transcription are identical in all organisms. The only difference is the DNA sequence itself, which is species or organism specific. Thus, as it is a new beetle species, its genetic code will be unique. However, it will be translated and transcripted in the same manner as that in all other species.Their mRNA will also have and use the same nucleic acids.

5. The removes introns from pre-mRNA.

The pre-mRNA includes both introns and exons. However, only exons are used in the protein synthesis, whereas the introns are removed during the pre-mRNA stage.

6. Each of many tRNA molecules contains an anticodon, and it binds to a specific amino acid.

The anticodon of a tRNA molecule is amino acid specific. Thus, it can bind to one or a few specific mRNA codons.

7. RNA contains uracil (U) instead of thymine (T).

Both DNA and RNA have phosphate groups bound to a nitrogenous base. However, the single stranded RNA has uracil instead of the thymine found in the double stranded DNA. Also, both RNA and DNA have cytosine and guanine.

6 0

3 years ago