Multiple Choice
In eukaryotic cell architecture, which cell type normally lacks a nucleus at maturity?
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1. Overview of Cell Biology
Eukaryotic Cell Architecture
Multiple Choice
In eukaryotic cell architecture, where are ribosomes found in plant and animal cells?
A
In both plant and animal cells, ribosomes are found free in the cytosol and bound to the rough endoplasmic reticulum.
B
Ribosomes are found only in plant cells because animals rely exclusively on mitochondria for protein synthesis.
C
Ribosomes are found only inside the nucleus in both plant and animal cells.
D
Ribosomes are found only in animal cells; plant cells use chloroplasts instead of ribosomes to make proteins.
Verified step by step guidance1
Understand the role of ribosomes: Ribosomes are the cellular structures responsible for synthesizing proteins by translating messenger RNA (mRNA). This function is essential in all living cells, including both plant and animal cells.
Recall the locations of ribosomes in eukaryotic cells: Ribosomes can be found in two main places — free-floating in the cytosol (the fluid part of the cytoplasm) and attached to the rough endoplasmic reticulum (RER), giving it a 'rough' appearance under a microscope.
Consider the universality of ribosomes: Since both plant and animal cells need to produce proteins for various functions, ribosomes are present in both cell types, not restricted to one or the other.
Evaluate the incorrect options: Ribosomes are not exclusive to plant cells, nor are they only inside the nucleus. Also, chloroplasts do not replace ribosomes; they have their own ribosomes but do not substitute the general protein synthesis machinery.
Conclude that the correct understanding is that ribosomes are found free in the cytosol and bound to the rough endoplasmic reticulum in both plant and animal cells.
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