Answer:
Eukaryotic cells are larger and more intricate than bacterial cells. The primary distinction between the cytoskeletons of eukaryotic and bacterial cells lies in the specific proteins they contain.
Explanation:
The cytoskeleton consists largely of networks of protein filaments, which help the cell maintain its shape, anchor organelles such as the nucleus and mitochondria, and facilitate transport within the cell. All cell types, including eukaryotes, bacteria, and archaea, possess a cytoskeleton. Eukaryotic cells tend to be more substantial due to having an assortment of organelles, leading to a more complex and larger cytoskeleton. Conversely, bacteria, which are simpler unicellular organisms with fewer organelles, possess a simpler yet vital cytoskeleton. Although the cytoskeleton is fundamentally alike in both groups, the protein types differ, with bacteria containing simpler proteins and eukaryotic cells comprising more complex proteins.
Embryological evidence
Explanation:
Deuterostomes include echinoderms, hemichordates, and chordates. Despite their diverse body structures, they all feature a mouth that forms secondarily during embryonic development, thought to be a derived evolutionary trait connecting a common ancestor to all its descendants (a synapomorphy). This mouth originates from the ectoderm layer through invagination opposite the blastopore in the gastrula.
Answer:
Each sensory neuron acts as a (an) stimulus to the central nervous system, whereas every motor neuron serves as a(an) transmitter from the central nervous system.
Answer: 4. evidence 5. Fact
