GENERAL HISTOLOGY

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INTRODUCTION

CELL STRUCTURE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A bacterium will construct different proteins to metabolize the sugars lactose or glucose, depending on which one it detects in the outside environment. What part of the bacterium allows it to recognize different substances in the outside environment?
A
nucleus
B
lysosomes
C
cell membrane
D
endoplasmic reticulum
Explanation: 

Detailed explanation-1: -Ribosomes-Ribosomes are microscopic “factories” found in all cells, including bacteria. They translate the genetic code from the molecular language of nucleic acid to that of amino acids-the building blocks of proteins.

Detailed explanation-2: -Cell-surface receptors are transmembrane proteins that bind signal molecules in the extracellular space and generate different intracellular signals on the opposite side of the plasma membrane.

Detailed explanation-3: -Why is it important that there are different types of proteins in plasma membranes for the transport of materials into and out of a cell? The proteins allow a cell to select what compound will be transported, meeting the needs of the cell and not bringing in anything else.

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