Fluid mosaic model exhibits amphipathy because of
glycoproteins
phospholipids
lipids
glycolipids
Chromosomes in a bacterial cell can be 1 to 3 in number and
are not circular or linear
can be circular as well as linear within the same cell
are always circular
are always linear
Which of the following is a single membranous structure?
Lysosome
Nucleus
Mitochondria
Chloroplast
A prokaryotic cell lacks
true nucleus
nuclear membrane
membrane bound organelles
All of the above
Passive food ingestion in Amoeba is known as :
import
invagination
circumfluence
circumvallation
Active transport occurs :
against concentration gradient and requires ATP
against concentration gradient and does not require ATP
along concentration gradient but require ATP
along concentration gradient but does not require ATP
A.
against concentration gradient and requires ATP
Active transport uses specific proteins called pumps, which use metabolic energy(ATP) to move ions or molecules against their concentration gradient. Common examples of active transport are Na+ - K+ ATPase. Ca++ ATPase and proton pump.
Which cell organelle is covered by only one unit membrane ?
Nucleus
Plastids
Mitochondria
Lysosome