Question

who is credited with first observing cells?
robert hooke
anton van leeuwenhoek
robert koch
louis pasteur
carolus linnaeus
question 43 (1 point)
the main structural component of bacterial cell walls is:
peptidoglycan
chitin
cellulose
phospholipids

Explanation:

Robert Hooke is credited with first observing cells. He used a microscope to look at a thin slice of cork and coined the term "cells". The main structural component of bacterial cell - walls is peptidoglycan. Chitin is in fungal cell - walls, cellulose in plant cell - walls, and phospholipids are in cell membranes.

Answer:

1. A. Robert Hooke
2. A. Peptidoglycan