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3 years ago

What happens during prophase

Biology

2 answers:

lawyer [7]3 years ago

5 0

Answer:

Prophase is the first phase of M-phase of cell division which is marked by many changes taking place in the dividing cell which are:

1. Chromatin condenses and becomes more coiled.

2. Chromosomes are seen as a pair of sister chromatids with a centromere.

3. Nucleolus-site of rRNA synthesis disappears.

4. Mitotic spindle- formation begins between two pairs of centrioles.

5. Nuclear envelope- disappears at late prophase.

Elan Coil [88]3 years ago

4 0

Answer:

Chromosomes become visible, the nucleolus disappears, the mitotic spindle forms, and the nuclear envelope disappears. Chromosomes become more coiled and can be viewed under a light microscope. ... The nuclear envelope disappears at the end of prophase.

Explanation:

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Modern scientists continue the tradition of the Greek philosophers in their efforts to understand the world around them. They kn

ddd [48]

Answer:

From Thales, who is often considered the first Western philosopher, to the Stoics and Skeptics, ancient Greek philosophy opened the doors to a particular way of thinking that provided the roots for the Western intellectual tradition. Here, there is often an explicit preference for the life of reason and rational thought. We find proto-scientific explanations of the natural world in the Milesian thinkers, and we hear Democritus posit atoms—indivisible and invisible units—as the basic stuff of all matter. With Socrates comes a sustained inquiry into ethical matters—an orientation towards human living and the best life for human beings. With Plato comes one of the most creative and flexible ways of doing philosophy, which some have since attempted to imitate by writing philosophical dialogues covering topics still of interest today in ethics, political thought, metaphysics, and epistemology. Plato’s student, Aristotle, was one of the most prolific of ancient authors. He wrote treatises on each of these topics, as well as on the investigation of the natural world, including the composition of animals. The Hellenists—Epicurus, the Cynics, the Stoics, and the Skeptics—developed schools or movements devoted to distinct philosophical lifestyles, each with reason at its foundation.

With this preference for reason came a critique of traditional ways of living, believing, and thinking, which sometimes caused political trouble for the philosophers themselves. Xenophanes directly challenged the traditional anthropomorphic depiction of the gods, and Socrates was put to death for allegedly inventing new gods and not believing in the gods mandated by the city of Athens. After the fall of Alexander the Great, and because of Aristotle’s ties with Alexander and his court, Aristotle escaped the same fate as Socrates by fleeing Athens. Epicurus, like Xenophanes, claimed that the mass of people is impious, since the people conceive of the gods as little more than superhumans, even though human characteristics cannot appropriately be ascribed to the gods. In short, not only did ancient Greek philosophy pave the way for the Western intellectual tradition, including modern science, but it also shook cultural foundations in its own time.

Explanation:

3 0

3 years ago

Summarize the steps that occur in the process of chromosomal DNA replication. Please place the following steps in the proper ord

grandymaker [24]

Answer:

The proper order is:

A. DnaA proteins bind to the origin of replication, resulting in the separation of the AT-rich region.

B. DNA helicase breaks the hydrogen bonds between the DNA strands, topoisomerases alleviate positive supercoiling, and single-strand binding proteins hold the parental strands apart.

C. Topoisomerases unravel the intertwined chromosomes, if necessary.

D. Primase synthesizes one RNA primer in the leading strand and many RNA primers in the lagging strand, and DNA polymerase III synthesizes the daughter strands of DNA.

E. DNA polymerase I removes the RNA primers and fills in that region with DNA, and DNA ligase covalently links Okazaki fragments together.

F. Replication continues until the two replication forks meet on the other side of the circular bacterial chromosome.

Explanation:

The process of DNA replication in prokaryotes starts at a point called ORIGIN OF REPLICATION. This site is where certain proteins recognize and bind to in order to kickstart the replication process. The following are orderly processes of DNA replication.

- DnaA proteins bind to the origin of replication, resulting in the separation of the AT-rich region.

- DNA helicase breaks the hydrogen bonds between the DNA strands to form two replication forks, topoisomerases prevent supercoiling of these separated DNA, and single-strand binding proteins hold the parental single strands apart, hence, making sure that they do not rewind again.

- In case DNA rewinds, topoisomerases unravel or disentangles the intertwined chromosomes, if necessary.

- DNA Primase synthesizes one RNA primer in the leading strand and many RNA primers in the lagging strand,which allows DNA polymerase III synthesize the daughter strands of DNA. Note that the synthesis of nucleotides on threading strand is continuous while nucleotides are synthesized in small fragments called OKAZAKI FRAGMENTS, on the lagging strand.

- DNA polymerase I removes the RNA primers and replaces with synthesized DNA in that region, and DNA ligase covalently links the Okazaki fragments (small fragments of DNA) together.

- Replication continues until the two replication forks meet on the other side of the circular bacterial chromosome.

5 0

4 years ago

Which process makes diversity possible

Kruka [31]

Speciation, the evolutionary process by which new species are formed, is clearly responsible for the ultimate generation of species diversity over geologic time.

8 0

2 years ago

It is important that cells make the correct proteins necessary for survival. Which of these is true concerning the processes of

Talja [164]

C.) <span>Plants produce proteins much differently than animals.

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4 years ago

Pea plants have purple flowers that are dominant to white flowers.

Goryan [66]

Answer:

The way the trait appears is its phenotype. In pea plants, purebred purple flowers have a genotype with two purple alleles, which produces a phenotype of purple petals. Purebred white flowers have a genotype of two white alleles, which displays the white phenotype.

Explanation:

8 0

3 years ago

What happens during prophase​

What happens during prophase