Question

1. which of the following structures of a eukaryotic cell is not likely derived from an endosymbiotic bacterium? (0.5pts)

□ mitochondrial dna
□ mitochondrial ribosomes
□ inner membrane
□ outer membrane

1. which type of nutrient uptake involves the engulfment of small dissolved molecules into vesicles? (0.5pts)

□ active transport
□ pinocytosis
□ receptor - mediated endocytosis
□ facilitated diffusion
prokaryotic cell

Explanation:

1. For question 15: The endosymbiotic theory states mitochondria evolved from free-living bacteria. The outer mitochondrial membrane is thought to come from the host eukaryotic cell's membrane during engulfment, not the original bacterial cell. Mitochondrial DNA, ribosomes, and inner membrane are derived from the ancestral bacterium.
2. For question 16: Pinocytosis is a form of endocytosis where cells engulf small dissolved molecules and fluids into vesicles. Active transport uses energy but no vesicle engulfment; receptor-mediated endocytosis targets specific molecules; facilitated diffusion is passive transport without vesicles.

Answer:

1. Outer membrane
2. Pinocytosis