Microbiology: Principles and Explorations
10th Edition
ISBN: 9781119390114
Author: Black
Publisher: WILEY
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Chapter 5, Problem 4.1SC
Most prokaryotes lack sterols in their plasma membranes. What functions do sterols, such as cholesterol, fulfill in eukaryotic plasma membranes?
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How are the eukaryotic ribosomes and cell membranes different fromthose of prokaryotes?
Steroids such as Estrogen or Testosterone are lipids which are found in the cytoplasm of living cells. They can pass across (dissolve in) the proto cell and prokaryote phospholipid bilayer because they: a) perform dehydration synthesis, b) dissolve in water, c) are ionic, d) they a soluble in the Fatty Acids of the bilayer, e) none are true.
Many eukaryote cells are NOT able to synthesize (make their own) the amino acids that they require to conduct life processes. When such a cell is placed in an aqueous (water) solution containing the 20 essential amino acids, one would expect that
a) nothing would happen.
b) amino acids would be moved into the cell by specific membrane transport proteins.
c) H2O would dissolve in the membrane.
d) the cell would make Glucose into amino acids.
e) the cell would divide.
Chapter 5 Solutions
Microbiology: Principles and Explorations
Ch. 5 - Are viruses prokaryotes? Eukaryotes? Why or why...Ch. 5 - Compare surface-to-volume ratios of prokaryotes...Ch. 5 - Prob. 1.3SCCh. 5 - Prokaryotes lack mitochondria. What structure does...Ch. 5 - Compare peptidoglycan and teichoic acid as to...Ch. 5 - What takes place in the periplasmic space? Which...Ch. 5 - Prob. 2.3SCCh. 5 - Compare the cell walls of Gram-positive,...Ch. 5 - How do bacteria move in chemotaxis? Distinguish...Ch. 5 - Prob. 3.2SC
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- A single celled, prokaryote organism has the ability to use the Na+/K+ pump in their cell membrane to move Na+ out of the cell and K+ into the cell. The Na+ /K+ pump is an example of a functional protein because it a) is a Polypeptide presents specific shapes that interact with (binds with) specific molecules, b) uses electrical interactions with these molecules to produce change in its shape or motion. C) interacts with specific molecules based on the fit of the molecule into specific active sites in the protein, d) As a result of the interaction with specific molecules, it can bind with ATP and use the bond energy in the ATP molecule to move the target molecule(s). e) all the answers are true.arrow_forwardWhy is it an advantage for eukaryotic cells to have different compartments (aka organelles) in the cell (separated by membranes) with different environments (ex: different pH’s, different enzymes present, etc)?arrow_forwardWhy does cholesterol play a critical role in cell recognition?arrow_forward
- Familial hypercholesterolemia is a genetic condition characterized by an absence of functional LDL receptors on the surface of cells. Patients who are homozygous for familial hypercholesterolemia usually die of coronary artery disease in childhood. Which of the following disorders could mimic the symptoms of familial hypercholesterolemia? (A) LDL receptor endocytosis machinery is non-functional (B) lack of ATP allosteric site on AMPK(C) Golgi proteases that cleave SREBP are not synthesized (D) mutation in the HMG CoA reductase SRE sequence. (E) inability to secrete VLDL from the liverarrow_forwardA spheroidal bacterium with a diameter of 1.0 μm (micrometer, 1 μm = 10-6) contains 25,000 molecules of the protein hexokinase. What is the molar concentration of the protein inside the cell?arrow_forwardEach of the ff. involves a disorder in the function of an organelle or other cell structure. Identify the cell organelle or cell structure involved and indicate whether it is likely to be underactive or active. a) A baby is placed on a low phenylalanine diet as his newborn screening results revealed that he inherited phenylketonuria. b) A girl suddenly felt weak and manifested cyanide poisoning symptoms after ingesting undercooked cassava which contains cyanoglycosides. c) A man develops pleiomorphic liposarcoma (rare cancer). The cause of the problem is a hard mass of cells in his right inner thigh that rapidly increased in size in a matter of 2 months. d) A male chef learns that he is infertile because his sperm are non-motile. Helping tags: biology, cell biology, cell structure, cell organellearrow_forward
- Why it is important for the cell membrane to be amphipathic ?arrow_forwardEnumerate four ultrastructures common to all cells whether prokaryotic or eukaryotic. What particular significance can you associate with the presence of these common ultrastructures in all cells?arrow_forwardWhich is true of ribosomes found in eukaryotic cells? They: A) contain DNA B) synthesize carbohydrates C) are attached to the Rough Endoplasmic reticulum (RER) and carry out the synthesis of proteins D) are found inside the endoplasmic reticulum E) are originally found associated with the endoplasmic reticulum in prokaryotic cells.arrow_forward
- Why does the protein Piezo have so many transmembrane helices?arrow_forwardWhat are the primary differences between prokaryotic and eukaryotic cells? List at least three (3) differences.arrow_forwardQuestion 14 Secondary protein structure occurs due to: a) hydrogen bonding b) ionic bonding c) covalent bonding d) hydrophobic interactions e) all of the above Question 15 A substance binds to a receptor on the cell membrane. Several moments later the substance can be found inside a vesicle inside the cell. This is an example of: a) exocytosis b) phagocytosis c) pinocytosis d) receptor-mediated endocytosis e) regulated secretion Question 16 ( Why is olive oil a liquid and lard a solid at room temperature? A) atoms of the lard are held together by ionic bonds B) olive oil is unsaturated, while lard is a saturated fat C) some of the carbon bonds in lard are double bonds D) oil has more non-polar bondsarrow_forward
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