Question 1

The four groups of protozoans are grouped by their mode of reproduction.

Accepted Answer

The four groups of protozoans are primarily grouped based on their mode of locomotion, not their mode of reproduction.

Question 2

Unlike antibiotics which target the 70S bacterial ribosomes, there are no known chemical substances which can bind to 80S eukaryotic ribosomes.

Accepted Answer

Some chemical substances, such as cycloheximide, can bind to 80S eukaryotic ribosomes and inhibit protein synthesis, indicating that there are known substances that target eukaryotic ribosomes.

Question 3

Binary fission, mitosis, and meiosis all produce genetically identical daughter cells.

Accepted Answer

Binary fission and mitosis produce genetically identical daughter cells, but meiosis results in daughter cells that are genetically diverse due to crossing over and independent assortment.

Question 4

Eukaryotic organelles may be targeted by environmental toxins or microbial pathogens. Describe two examples of disease in humans which result from damage or malfunction to an organelle or other intracellular structure.

Accepted Answer

The answer of Eukaryotic organelles may be targeted by environmental...

Question 5

Protozoan infections are common in (though definitely not limited to) developing countries where limited medical and laboratory facilities may hinder diagnosis. Each of the four groups of protozoans may be identified by certain characteristics visible under the microscope. Name the groups and explain those characteristics which lead to identification.

Accepted Answer

The answer of Protozoan infections are common in (though definitely...

Question 6

Describe the sequence of events in the evolution of eukaryotic cells as described by the endosymbiotic hypothesis. List four pieces of evidence which support this theory.

Accepted Answer

The answer of Describe the sequence of events in the...

Question 7

The kingdom Protista contains species which have plant- like features, others which contain animal- like features, and still others that contain fungal- like features. This is because scientists do not have a set of standard features by which to group them.

Accepted Answer

The kingdom Protista is indeed a diverse group of organisms that exhibit characteristics similar to plants, animals, and fungi. This diversity is because Protista serves as a catch-all category for eukaryotic organisms that do not fit neatly into the other kingdoms, rather than the absence of standard features for classification.

Question 8

Cells which are active and have high energy demand will have more mitochondria than cell that are less active and have lower energy demand.

Accepted Answer

Mitochondria are the powerhouses of the cell, producing the majority of the cell's supply of adenosine triphosphate (ATP), used as a source of chemical energy. Cells with higher energy demands, such as muscle cells, have more mitochondria to meet their energy needs.

Question 9

Animal cells are unique among all other eukaryotic groups in that they universally lack a cell wall.

Accepted Answer

Animal cells lack a cell wall, which distinguishes them from plant cells, fungi, and many protists that possess cell walls made of various substances.

Question 10

Bacterial plasma membranes differ from eukaryotic plasma membranes in that bacterial membranes always contain cholesterol while eukaryotic membranes rarely do.

Accepted Answer

Eukaryotic plasma membranes often contain cholesterol, while bacterial plasma membranes typically do not contain cholesterol.

Question 11

Antimicrobial therapies against fungal or protozoan pathogens are challenging to develop because these microbes have eukaryotic cells just as humans do. However, differences do exist between animal cells and the cells of these microbes which provide the opportunity to develop therapies which target these unique structures or molecules. Describe three cellular components of fungal and/or protozoan cells which are not found in animal cells which could be potential targets for drug therapy.

Accepted Answer

The answer of Antimicrobial therapies against fungal or protozoan pathogens...

Quiz 4: Introduction to Eukaryotic Cells