Which Structure Is Present in All Eukaryotic Cells Investigated So

question 10

Multiple Choice

Which structure is present in all eukaryotic cells investigated so far?

• A) motor proteins
• B) actin-tubulin cytoskeleton
• C) nuclear lamins
• D) cytoplasmic intermediate filaments
• E) microtubule-associated proteins

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Definitions:

Environment

The surrounding physical, biological and socio-economic conditions in which an organism or community lives.

Shaping Development

The process by which behavior is gradually guided toward a desired pattern through positive reinforcement of successive approximations to the target behavior.

Cellular-Clock Theory

A theory suggesting that aging is the result of cells hitting a limit on the number of times they can divide, influenced by telomeres' length at the ends of chromosomes.

Free-Radical Theory

A theory suggesting that organisms age due to cells accumulating free radical damage over time.