Answer:
Populations of organisms that exhibit a high degree of variation have a greater chance for survival than populations of organisms that show little variation. This statement is usually true.
Explanation:
Answer:
Homologous organs
Explanation:
The forelims of frogs, birds, rabbits and lizards are adapted to perform different functions as per the lifestyle of these animals. But forelimbs in given animals are made of same type and pentadactyl pattern of bones. The forelimbs of frogs, birds, rabbits and lizards are thus, homologous organs. Their origin is the same but perform diferent functions. This is an evidence of divergent evolution and these animals share common ancestory.
Answer: B) Rough endoplasmic reticulum
Explanation:
Answer:
The nuclear lamina is an array of filaments on the inner side of the nuclear ... If a method were found that could cause the lamina to fall into disarray, ...
Explanation:
1. The nuclear lamina is a network inside the nucleus which maintain the shape of nucleus.
2. It is composed of intermediate filaments and many proteins.
3. It providing mechanical support to the nucleus and play many other rolls in the cell.
4. In a cell if the nuclear lamina fall into disarray, the nucleus is misshapen and all these processes run awry. Such cells in which nuclear lamina is broken, they tend to become senescent in response to internal dysfunction, and cause damage to surrounding tissue.
Answer:
Mitochondria and chloroplasts are considered semi-autonomous organelles, as they resemble bacteria. They have DNA, RNA and ribosomes, and are capable of synthesizing proteins. They reproduce by binary division. Each organelle has several copies of circular DNA, but its genetic information is not enough to classify the organelle's proteins. For this reason, mitochondria and chloroplasts are divided by two genetic systems, that of the organelle and that of the cell nucleus.
Explanation:
Endosymbiotic theory suggests that mitochondria and chloroplasts evolved when bacteria were phagocyted by an ancestral eukaryotic cell. Acquiring mitochondria is a very important stage for eukaryotes, because thanks to them the ability to aerobic respiration was achieved. On the other hand, chloroplasts arose when some eukaryotes phagocytized photosynthetic bacteria and the symbiotic relationship between them was established.