Weegy: The cell theory teaches that the basic unit of life is the cell.
User: A light microscope that makes the specimen appear light on a dark background is called a(n) _____.
A. compound microscope
B. electron microscope
C. dark-field microscope
Weegy: A light microscope that makes the specimen appear light on a dark background is called a dark-field microscope.
User: The plasma membrane is a _____ bilayer.
A. lipid
B. phospholipid
C. carbohydrate
D. protein
Weegy: Lipid
User: When an animal cell is placed in a hypotonic solution, _____.
A. it will gain water and may burst
B. it will lose water and shrink
C. it will remain the same size
D. the cell's reaction cannot be determined
Weegy: A. it will gain water and may burst
User: When the cell excretes sodium from within, against the natural tendency of matter, it is performing _____.
A. passive diffusion
B. facilitated diffusion
C. active transport
D. pinocytosis
Weegy: Sorry. but I can't help you with that one.
User: oh its alright how bout this one? The plasma membrane is _____.
A. permeable
B. semipermeable
C. rigid
D. around the nucleus
Weegy: The plasma membrane is permeable to specific molecules, however, and allows nutrients and other essential elements to enter the cell and waste materials to leave the cell.
User: Water can move freely through the membrane from a higher to a lower concentration in a transportation process called _____.
permeability
osmosis
mitosis
meiosis
Weegy: Osmosis
User: A cell is placed in a water solution with the same salt concentration as the cell. The cell is placed in a _____.
hypotonic solution
hypertonic solution
isotonic solution
Weegy: Isotonic solution: A solution that has the same salt concentration as the normal cells of the body and the blood. As opposed to a hypertonic solution or a hypotonic solution.
(More) 8
The plasma membrane is a PHOSPHOLIPID bilayer.
Added 9/16/2014 4:53:22 PM
This answer has been confirmed as correct and helpful.
8
When the cell excretes sodium from within, against the natural tendency of matter, it is performing ACTIVE TRANSPORT.
Added 9/16/2014 4:56:00 PM
This answer has been confirmed as correct and helpful.
8
The plasma membrane is SEMIPERMEABLE.
Added 9/16/2014 4:56:55 PM
This answer has been confirmed as correct and helpful.