Phagocytosis and Immune System Quiz
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Questions and Answers

What is the focus of the chapter on eukaryotic cells?

  • The challenges in treating fungal and parasitic infections
  • The spread of deadly fungus in the northwestern United States
  • The differences between prokaryotes and eukaryotes (correct)
  • The variation among protists and fungi

Why are fungal and parasitic infections challenging to treat?

  • The high mutation rate of fungi and parasites
  • Due to the limited availability of drugs targeting eukaryotic cells
  • Because there are fewer differences to exploit between eukaryotic pathogens and human cells (correct)
  • The lack of understanding of basic cellular differences between eukaryotes

What is the estimated percentage of characterized land-dwelling eukaryotes?

  • About 50%
  • About 75%
  • About 16% (correct)
  • About 25%

Why is the continuous exploration of basic cellular differences between eukaryotes important?

<p>To develop new drug therapy targets for fungal and parasitic infections (C)</p> Signup and view all the answers

What is the projected number of different drug therapy targets in eukaryotic cells?

<p>Over 80 million (D)</p> Signup and view all the answers

What is one of the key reasons why fungal and parasitic infections can be challenging to treat?

<p>Limited availability of drugs targeting eukaryotic cells (D)</p> Signup and view all the answers

What is the function of receptors on the cell surface in phagocytosis?

<p>To bind to features on the agent being engulfed (B)</p> Signup and view all the answers

What happens to the target once it enters the cell in phagocytosis?

<p>It fuses with a lysosome to form a phagolysosome (B)</p> Signup and view all the answers

What is the role of hydrolytic enzymes in phagocytosis?

<p>To destroy most cells and viruses engulfed by phagocytosis (A)</p> Signup and view all the answers

What is the main purpose of exocytosis in cells?

<p>To transport substances to the cell surface (C)</p> Signup and view all the answers

In receptor-mediated endocytosis, what happens when a ligand binds to a receptor on the cell surface?

<p>The ligand and receptor fuse to form a vesicle (A)</p> Signup and view all the answers

What is the fate of the ligand and receptor after forming a clathrin-coated vesicle in receptor-mediated endocytosis?

<p>They separate from one another and are sorted to their final destinations (D)</p> Signup and view all the answers

What would happen to a cell's plasma membrane if there was more endocytosis than exocytosis?

<p>The plasma membrane would shrink in size (B)</p> Signup and view all the answers

What is the most common form of receptor-mediated endocytosis?

<p>Clathrin-mediated endocytosis (D)</p> Signup and view all the answers

What is the process by which building block subunits are linked to make a larger molecule or polymer?

<p>Polymerization (A)</p> Signup and view all the answers

What is the function of clathrin in receptor-mediated endocytosis?

<p>To form clathrin-coated vesicles for importation of ligands (A)</p> Signup and view all the answers

What is the main purpose of a lysosome in phagocytosis?

<p>To destroy most cells and viruses engulfed by phagocytosis (C)</p> Signup and view all the answers

What is the process by which eukaryotic cells remove things from the cell?

<p>Exocytosis (B)</p> Signup and view all the answers

Which type of cell division is the most common way eukaryotic cells divide?

<p>Mitosis (D)</p> Signup and view all the answers

What are the specialized cells required for sexual reproduction in humans called?

<p>Gametes (C)</p> Signup and view all the answers

Which type of reproduction does meiosis belong to?

<p>Sexual reproduction (C)</p> Signup and view all the answers

What is the term for the process of endocytosis that means 'cell drinking'?

<p>Pinocytosis (D)</p> Signup and view all the answers

Which type of cells divide using mitosis, except for egg and sperm cells?

<p>Diploid cells (A)</p> Signup and view all the answers

During which process do substances from the extracellular environment enter the eukaryotic cell in membranous endocytic vesicles?

<p>Pinocytosis (B)</p> Signup and view all the answers

How many genetically unique cells are produced by meiosis from one parent cell?

<p>4 (D)</p> Signup and view all the answers

What is the term for the process of endocytosis that means 'cell eating'?

<p>Phagocytosis (A)</p> Signup and view all the answers

Which type of cell division involves copying genetic material before division and generates haploid daughter cells?

<p>Meiosis (A)</p> Signup and view all the answers

What is the term for a genetically unique zygote formed from two complementary gamete cells?

<p>Diploid cell (B)</p> Signup and view all the answers

Which type of organelles use a binary fission-like method of division?

<p>Mitochondria and Chloroplasts (D)</p> Signup and view all the answers

Which type of organisms carry out photosynthesis to make their own organic carbon using light energy?

<p>Plants (A)</p> Signup and view all the answers

What is the estimated percentage of the world's population infected with some sort of helminth at any given time?

<p>50% (C)</p> Signup and view all the answers

Which of the following is a characteristic of flukes (trematodes)?

<p>Segmented, flat, ribbon-like structure (C)</p> Signup and view all the answers

What is the main transmission mechanism for flukes (trematodes)?

<p>Embryonated eggs from host feces enter water and hatch; released larvae mature in snails and then are either ingested in contaminated food/water or burrow into human host (A)</p> Signup and view all the answers

Which of the following is true about plants?

<p>They are not capable of causing infectious diseases. (B)</p> Signup and view all the answers

What is the role of chloroplasts in plant cells?

<p>They carry out photosynthesis to make organic carbon. (A)</p> Signup and view all the answers

What is the most prevalent approach to reproduction for fungi?

<p>&quot;Asexual spores arise from mitosis, and do not result in genetic variation.&quot; (B)</p> Signup and view all the answers

"What is the estimated number of different species believed to be included in the Kingdom Fungi?"

<p>&quot;Over 600,000&quot; (B)</p> Signup and view all the answers

"What is the characteristic feature of septate hyphae in fungi?"

<p>&quot;Divisions between each cell in the filament&quot; (D)</p> Signup and view all the answers

"What type of spores are used for reproduction by fungi?"

<p>&quot;Fungal spores&quot; (C)</p> Signup and view all the answers

"What is the estimated number of different plant species?"

<p>&quot;Over 290,000&quot; (B)</p> Signup and view all the answers

"What do most fungi rely on extracting for carbon?"

<p>&quot;Carbon from the nutrients they absorb from their environment&quot; (A)</p> Signup and view all the answers

According to the endosymbiotic theory, how did eukaryotes evolve?

<p>Through a series of sequential, cell-merging events with prokaryotes (A)</p> Signup and view all the answers

What evidence supports the endosymbiotic theory?

<p>Mitochondria and chloroplasts have their own circular DNA and 70S ribosomes, similar to bacteria (A)</p> Signup and view all the answers

What is the main difference between the genetic material of eukaryotes and prokaryotes?

<p>Eukaryotes have multiple linear chromosomes while prokaryotes have a single circular chromosome (D)</p> Signup and view all the answers

What is the significance of mitochondria and chloroplasts having a double-membrane structure?

<p>It supports the theory of cell-merging events between ancient eukaryotic ancestor and prokaryotes (A)</p> Signup and view all the answers

Why is the information about eukaryotic cells important?

<p>To explain why some drugs affect bacteria but not eukaryotic cells (A)</p> Signup and view all the answers

What distinguishes eukaryotic cells from prokaryotic cells?

<p>Eukaryotic cells have larger genomes spread across multiple linear chromosomes, unlike prokaryotic cells (A)</p> Signup and view all the answers

What is the main difference in the cell division process between eukaryotes and prokaryotes?

<p>Eukaryotes undergo mitosis and meiosis while prokaryotes undergo binary fission exclusively (D)</p> Signup and view all the answers

What do mitochondria and chloroplasts replicate by, which is similar to bacteria?

<p>Binary fission (A)</p> Signup and view all the answers

What type of relationship do endosymbiotic theory propose for the cell-merging events?

<p>Mutually beneficial (A)</p> Signup and view all the answers

What does the prefix 'endo' in endosymbiotic indicate?

<p>Inside (A)</p> Signup and view all the answers

What were the engulfed cyanobacteria known as after they lost the ability to live freely outside of their hosts?

<p>Chloroplasts (B)</p> Signup and view all the answers

Why is it debated whether the protoeukaryote was a full-fledged, nucleus-containing eukaryote or not?

<p>Because it's still uncertain whether it engaged in cell-merging events with prokaryotes (C)</p> Signup and view all the answers

What is the main function of exocytosis?

<p>To remove unwanted waste products from the cell (B)</p> Signup and view all the answers

Why do highly phagocytic cells like macrophages need to constantly repair and restore their plasma membrane?

<p>To avoid self-consumption of their plasma membrane (C)</p> Signup and view all the answers

How does HIV enter host cells?

<p>By fusing with the plasma membrane (B)</p> Signup and view all the answers

What is the main purpose of Enfuvirtide in HIV therapy?

<p>To lower the amount of HIV present in the blood (D)</p> Signup and view all the answers

Why would a general block on all cellular endocytosis be hazardous to eukaryotic cells?

<p>It would prevent expulsion of unwanted waste products (D)</p> Signup and view all the answers

What is the estimated number of animal species on our planet?

<p>Over 7.5 million (C)</p> Signup and view all the answers

Which kingdom includes potential pathogens or parasites, except for plants?

<p>Animalia (C)</p> Signup and view all the answers

What is a broad collection of organisms that spans roundworms and flatworms?

<p>Helminths (B)</p> Signup and view all the answers

'Helminths' tend to have complex life cycles that can involve different host species. What do they act as when they live in or on a host?

<p>'Parasites' (D)</p> Signup and view all the answers

'Most helminthic parasites in humans spend at least some part of their life cycle in the gastrointestinal tract.' What type of parasites are these?

<p>'Gastrointestinal parasites' (C)</p> Signup and view all the answers

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