Answer:
The primary distinction between these two types of organisms is that eukaryotic cells have a membrane-bound nucleus and prokaryotic cells do not. ... The nucleus is only one of many membrane-bound organelles in eukaryotes. Prokaryotes, on the other hand, have no membrane-bound organelles.
Explanation:
A flagellum, is a structure in single celled organisms that pave the way for movement. In sperm cells for example, they can transport themselves so quickly due to the rapid movement of the flagellum.
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Answer/Explanation:
Gene mutations are changes to the DNA sequence that arise by chance. These changes can cause the gene to have different functions. Usually, these functions are not beneficial - i.e. the mutation makes the gene work less efficiently or not at all.
However, on rare occasions, the altered gene function is advantageous, meaning it gives the organism a benefit for survival.
Mutations in the germ line are always passed on to the next generation, i.e. they are inherited. But if a mutation gives a selective advantage by helping survival, then that organism is more likely to survive to reproductive age and pass the mutation on.
The inheritance of this mutation and the selective pressures acting upon it are the driving forces of evolution.
The accumulation of mutations and the pressures of natural selection can affect different populations of the same species differently. For example, if one small population of birds migrates to an island with a different food source, then the selective pressures will be different than for their relatives on the mainland.
Over time, speciation will occur, and two new species will form. While they have a common ancestor, they are no longer the same species as evolution has caused them to diversify.
Answer:
first, to be a barrier keeping the constituents of the cell in and unwanted substances out and, second, to be a gate allowing transport into the cell of essential nutrients and movement from the cell of waste products.
Explanation:
Answer:
C. All living things are made up of at least one cell.
Explanation:
A cell is a structure formed of carbon-based molecules with the cytoplasm inside the membrane which contains the bio-molecules needed to survive like the proteins, DNA, enzymes, and others.
The structures when studied by the Schelidnen in plant cells and Schwann in animal cells concluded that the living organisms are composed of the cells and cell is the smallest unit of life as it is the functional and structural unit of life and formulated the cell theory.
Since all living organisms are composed of the cell, therefore, Option-C is the correct answer.