Exam 1 Flashcards
(20 cards)
Which of the following is a property of life that scientists agree viruses can fulfill?
Ability to evolve
Proteins are polymers of how many different amino acids?
20
Some organelles such as mitochondria and chloroplasts are thought to have originated in eukaryotic cells via a process called
Endosymbiosis
Which of the following is the best description about the nucleic acid found in the virus particles of a virus?
Viruses contain DNA or RNA but not both
Rna is hypothesized to have been the genetic material of the original cell because
RNA is capable of catalyzing some chemical reactions like self-replication
Which of the following is a difference between glycogen and cellulose?
Alpha vs. Beta bond linking sugars together
Which of the following is not a property of water?
Large uncharged molecules dissolve readily in it
Which of the following is found in all cells?
Ribosomes
Lipids play a major role in cells as
All the other choices are correct
Hydrogen bonding is frequently observed in which of the following?
Nucleic, acids, proteins, and carbohydrates
Active transport differs from facilitated diffusion that
Active transport involves the transport of molecules up or against their concentration gradient
Which of the following lists all the types of molecules that could be found in the plasma membrane of animal cells?
Phospholipids, proteins, glycolipids, cholesterol, sphingolipids
In fluorescence microscopy, the light detected is light that has been ____ by the sample?
Emitted by a fluorophore
Integral membrane proteins are able to move
Laterally within the plane of a membrane
Cholesterol affects the fluidity of membranes into which it inserts by
Decreasing membrane fluidity at high temperatures, and increasing membrane fluidity at low temperatures
Which of the following is true about the phospholipids one would observe in the membranes of an eukaryotic organism?
The type of phospholipids found would vary in all aspects
The nematode worm Caenoehabditis elegans is good model system because it allowed researchers to
Follow the developmental lineage of all the cells found in an adult from a single fertilized egg cell microscopically
Coupled transport of glucose and Na+ into the intestinal epithelial cell is an example of
Symport
What kind of molecules can readily cross the lipid bilayer?
Small, uncharged molecules and hydrophobic molecules
Phospholipids in a membrane commonly
Both move laterally and rotate within one leaflet of the bilayer
