Cell Organelles and their Functions

This is an MCQ-based quiz on Cell Organelles.

This includes Nucleus, Ribosomes, Endoplasmic reticulum, Golgi apparatus, Chloroplasts, and Mitochondria.

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Which of the following best describes the ribosome in terms of its structural components?

RNA monomer DNA-protein complex RNA-protein complex Multimeric protein complex Protein subunit

Which of the following is true about eukaryote ribosomes?

Eukaryote ribosomes are 80S, with two large 60S subunits and one small 40S subunit Eukaryote ribosomes are 80S, with one large 60S subunit and one small 40S subunit Eukaryote ribosomes are 70S, with one large 60S subunit and one small 40S subunit Eukaryote ribosomes are 80S, with one large 50S subunit and one small 40S subunit Eukaryote ribosomes are 80S, with one large 50S subunit and one small 30S subunit

Ribosomes are the organelle responsible for the translation of mRNAs into proteins. To do this, ribosomes translate the mRNA codons into amino acids which are joined to form a long polypeptide. The ribosome has a catalytic domain that is responsible for the formation of the peptide bonds between these amino acids. What is the name, i.e. the enzymatic classification, of this domain in the ribosome?

Polymerase Peptidyl transferase AminoATPase Ester transferase Peptidyl acylase

Which of the following is not a common destination for proteins translated by membrane-bound ribosomes?

Secretory vesicles Plasma membrane Cytosol Lysosomes

The inner mitochondrial membrane is organized into cristae, which essentially results in a series of folds within the mitochondria. Which of the following best describes the primary advantage to having cristae in inner compartments of mitochondria?

Decreased requirement for input to the mitochondrion due to increased presence of glucose on the cristae membrane. Increased spacing of cytochromes to increase metabolic output. Increased surface area for the biochemical reactions to produce ATP, thus increasing metabolic output of each mitochondrion. Protection of integral membrane proteins from the extremely basic intracristal space of the mitochondria. ATP synthase is sequestered from the outer membrane, thus increasing its potential energy.

What provides structural support for the nucleus and binds chromatin?

Nuclear pores Nucleolus Lamina Nuclear envelope Cytoskeleton

Which of the following is true regarding the nucleus?

The nucleus is the site of assembly for ribosomal subunits The nucleus is surrounded by multiple membranes The nucleus is studded with many openings called nuclear pore complexes All of these answers

How are proteins imported into the nucleus?

With the assistance of special proteins known as importins Passive diffusion through nuclear pore complexes Translocation through nuclear pore complexes while they are being translated by membrane-bound ribosomes Proteins are only exported from the nucleus

Chloroplasts are found primarily in which cell type?

Sclerenchyma Parenchyma None of these Collenchyma Mesophyll

Which organelle is used to create triglycerides and other lipids?

Smooth endoplasmic reticulum Golgi apparatus Rough endoplasmic reticulum Ribosome

Quiz/Test Summary

Title: Cell Organelles and their Functions

Questions: 10

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