Cell and molecular biology quizzes
Which of these attributes are shared by both prokaryotic and eukaryotic cells?
A cellular membrane
Which of these structures is absent in a prokaryotic cell?
A separated nucleus bound by a membrane
Which of these mechanisms of membrane transport requires energy (ATP) investment?
Active transport
If the nucleus is the administrative sector of the manufacturing plant, what are the ribosomes?
Assembly line workers
Regarding the genetic material of a cell, which statement is false?
Both prokaryotes and eukaryotes have roughly the same amount of DNA
What is not a function of the peroxisome?
Chemically modify proteins prior to secretion
When a bacteria is destroyed, its' cellular components fracture and dissolve in solution. If this occurs while a pathogenic bacteria is in the blood, it can lead to the bacterial cellular components suddenly spiking in concentration in the bloodstream. Although the bacteria may be killed, the immune system perceives an increase of bacterial components as a signal the infection has worsened. Given this, practitioners are more carful in treating septic Gram-negative infections than Gram-positive infections because of the possible side effect of...
Endotoxin (LPS) spiking, causing hemorrhage, fever and shock
How does a cell break down and recycle a damaged organelle?
Engulfing or fusing the item with a lysosome
Eukaryotic cells are generally much smaller than prokaryotic cells
False
Which cytoskeletal proteins are also the "spindle fibers" during cell division?
Microtubules
What statement about the mitochondria is false?
Mitochondria numbers do not vary from cell to cell
Which statement concerning biofilms is false?
Most prokaryotes in nature do not live in biofilms
Unlike eukaryotes, prokaryotes have no membrane-bound organelles. How, then, are prokaryotes able to generate energy?
Prokaryotes generate proton gradients across their plasma membranes
Which statement about ribosomes is incorrect?
Ribosomes are the same structure in prokaryotes and eukaryotes
This is a studded endomembrane system which is responsible for chemically modifying and transporting the proteins produced by the ribosomes on its surface.
Rough Endoplasmic Reticulum
One of the widest accepted scientific theories is Darwin's Theory of Evolution by Natural Selection. Which statement below would be inaccurate?
Science has proven that natural selection is how evolution works.
This is a non-studded endomembrane system which is responsible for lipid synthesis, calcium level regulation and detoxification
Smooth Endoplasmic Reticulum
A person steps on a rusty nail which had been sitting exposed in the hot, dry sun. The person gets an infection from Clostridium tetani, the etiological agent of tetanus and an anaerobic soil bacteria. Given that the nail was extremely hot and dry, what is the most likely explanation for the presence of the bacteria on the nail?
The bacteria was in the form of a dormant endospore on the nail surface
Gram staining prepares bacteria to be visualized under light microscope. What allows a bacteria to stain positively with gram stain?
The bacteria's thick peptidoglycan cell walls
Hungarian physician Ignaz Semmelweis noticed that when his interns and physicians delivered babies, the rates of childbed fever were much higher than when midwives delivered. What was his suspicion?
The physicians and interns were spreading the disease from other sources to the pregnant women
This is a membrane bound sac responsible for the intracellular transport of various products.
Vesicle
Nine pairs of microtubules form a circle around a central pair, in which dynein repeatedly binds and releases resulting in locomotion. This 9:2 pattern refers to the...
basic structure of cilia and flagella
What is not a feature of cell theory?
cells can arise by either crystallization of by biogenesis
Intermediate filaments
diverse group of medium sized cytoskeleton polymers, playing roles in cell adhesion and anchoring organelles
A Scientific Law is the only concept in science that is not able to be changed or overturned in light of new data.
false
A Scientific Theory is an educated guess about a very specific phenomenon
false
Microtubules
hollow rods of tubulin dimers (alpha and beta); which provide tracks for movement of vesicles; also components of eukaryotic cilia and flagella
A cell in a hypertonic environment will...
lose water and shrivel
Which of the following would not be found in a prokaryotic cell?
mitochondria
Polymath Robert Hooke is known in biology for...
observing, and coining the term "cells"
A membrane bound structure with a specialized function in a eukaryotic cell is called a(n)...
organelle
An unknown cell type has been isolated. It is suspected that this cell is prokaryotic. The presence of which of these cell structures would confirm that the cell is prokaryotic
peptidoglycan cell wall
A cell can transport very specific substances (like LDL) into the cytoplasm via...
receptor mediated endocytosis
This arrangement of prokaryotic cells refers to a chain of circular shaped cell
streptococcus
In terms of Scientific Theory, the example of Schrödinger's Cat shows that...
testing hypotheses is critical to forming conclusions about the natural world
Monotrichous, peritrichous, amphitrichous and lophotrichous are all ways to describe...
the way prokaryotic flagella can be arranged
Which is false of the bacterial ribosome?
they are 80s in total
The fact that chloroplasts and mitochondria have ribosomes, DNA and cell division patterns similar to bacteria led Lynn Margulis to support the idea that...
they were prokaryotic in origin
One criteria for a Scientific Hypothesis is that the hypothesis be testable
true
Microfilament
two intertwined actin filaments; which work in concert with motor proteins; assist in cell mobility
Which of these cell shapes means "curved rod"
vibrio
Koch's postulates
were developed to determine the microbial cause for specific diseases
