What observation led researchers to propose that chloroplasts evolved from cyanobacteria? A) Both produce proteins. B) Both contain mitochondria. C) Both provide structure to cells. D) Both perform photosynthesis.

Answers

Answer 1

Answer: (D) Both perform photosynthesis is the observation that led researchers to propose that chloroplasts evolved from cyanobacteria.
Chloroplasts is the area where photosynthesis takes place. It is a green organelle in a plant cell. Pigments called the chloros in a chlorophyll are needed for the photosynthesis.
Cyanobacteria or blue-gree algae contains a blue photosynthetic pigment and a chlorophyll for photosynthesis.

Answer 2

Answer:

Answer:

Explanation:

edge

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Which type of volcano is most likely to produce viscous lava

Answers

Composite volcanoes (also called stratovolcanoes) are much more explosive than shield volcanoes, the other important type of volcano.

Answer:

stratovolcano

Explanation:

Is the following sentence true or false? The composition of the atmosphere changes every few kilometers as you move away from earth.

Answers

This sentence is True because the air thins throughout the atmosphere.

What happens when a cell's proteins do not detect a mutation?a. the mutation leaves the cell before cell division
b. the mutation remains with the cell and is passed on in division
c. the protein is psubstituted with a mutation
d. the mutation becomes part of the protein

Answers

The answer is b. the mutation remains with the cell and is passed on in division.

Mutations occur on DNA molecules, so the mutation cannot become part of the protein nor the protein can be substituted with a mutation. Once a mutation happens it remains with the cell unless it is detected by cellular mechanism and fixed. If cell does not detect the mutation, it will not be fixed and the mutation will remain forever with the cell. In the normal process of mitosis (cell division), it will be passed down to the next generation of cells.

According to the theory of _____________, mitochondria in cells today are the descendents of aerobic prokaryotes that used oxygen to generate energy.A) endosymbiosis
B) ingestion
C) mutualism
D) parasitism

Answers

Answer: A. endosymbiosis

The theory of endosymbiosis states that mitochondria in cells are once the descendants of aerobic prokaryotes. These prokaryotes used oxygen in order to generate energy. The mitochondria and the chloroplast are among the most important organelles that support endosymbiosis.

Answer:

Explanation:

Charles Darwin did poorly in school as a young boy. How did his poor performance belie his genius?

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Charles Darwin always had a taste for natural history as a kid, as far back as eight, in spite of how he performed in school. When he was a young adult, he got an apprentice ship as a doctor from his father who was also a doctor. This gave him experience with the anatomy of the human body. When being a doctor started to bore him, he learned taxidermy, exposing him to the anatomy of wild animals. Later he joined the Plinian Society which was a student natural history group that often debated and questioned the current topics and views of the subject in that time. Not too mention the many natural historians and evolutionists who also inspired him, one of which was his own grandfather,that gave him the support he needed. I guess that even though his normal school curriculum did not interest him, his self determination was enough to keep him grounded to his interests, proving that sometimes a great education doesn't always make you a genius. (idk :) Charles Darwin was smart in his own ways.

In meiosis II what happens during anaphase?

Answers

Answer:

Pulling apart or separation of sister chromatids

Explanation:

Meiosis is a type of cell division that results in four daughter cells with each having half number of chromosomes as the parent cell. It is the cell division that leads to formation of gametes to enable sexual reproduction. Division occurs twice during meiosis because before the two halves of a duplicated chromosome called sister chromatids separate, it still needs to separate homologous chromosome, which is a similar but non-identical pair of chromosome received from both parents. Hence, meiosis occurs in a two step division process i.e. Meiosis I and Meiosis II.

Meiosis II is the mitotic division of each of the haploid cells produced in meiosis I. Note that, homologous chromosomes separate in anaphase I of meiosis I, and further undergoes cytokinesis (division of cytoplasm) to produce two haploid (reduced number of chromosomes) daughter cells.

During anaphase of meiosis II, the individual chromosomes (sister chromatids) separate at the centromeres (point of attachment between two sister chromatids). The separated chromosomes are pulled apart towards each pole of the cell by the spindle fibres.

Meiosis II the chromosomes are pulled to the center of the cell and line up randomly at the equato
Anaphase II the centromere of each chromosome splits -the sister chromatids separate and move to opposite poles

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