MICRO EXAM 1 Flashcards
A cell may allow a large or charged chemical to move across the cytoplasmic membrane, down the chemicals electrical and chemical gradients, is a process called
Which of the following statements concerning growth and reproduction is false?
A living organism must reproduce to be considered alive.
A "9+2" arrangement of microtubules is seen in?
Which of the following is most associated with diffusion?
Which of the following is not associated with prokaryotic organisms?
Which of the following is true of Svedbergs?
They are an expression of sedimentation rate during high-speed centrifugation.
What are cell walls compose of?
a glycocalyx do not?
form pseudopodia for faster mobility of an organism.
are anchored to the cell by a basal body
Which cellular structure is important in classifying a bacterial species as Gram-positive or Gram-negative?
A gram-negative cell is moving uric acid across the cytoplasmic membrane against its chemical gradient. What statement is true?
The acid moves by an active process such as active transport.
have a thick cell wall which retains crystal violet dye, contain teichoic acids in their cell walls, and appear purple after Gram staining.
are dormant, resistant cells.
Inclusions have been found to contain
Dipicolnic acid is an important component of
"Suugar cup" composed of polysaccharides and/or polypeptides.
Responsible for motility of spirochetes
Made of tubulin in eukaryotes
Bristlelike projections found in quantities if 100 or more.
Extensions not used for cell motility
Numerous "grappling-hook" projections
site of protein synthesis
Allows contraction of the cell
contains microtubules in "9+0" arrangement
Site of most DNA in eukaryotes
Its internal membranes are sites for ATP production.
Functions as the transport system within a eukaryotic cell
Packages large molecules for export from a cell
Contains enzymes to neutralize hydrogen peroxide.
What is the function of glycocalyces and fimbriae in forming a biofilm?
They adhere cells to one another and inanimate objects and fimbriae attaches the archaea to surfaces
What factors may prevent a molecule from moving across a cell membrane?
size, charge, and polarity