The Normal Cell Flashcards
Eukaryotic cells
-May only be multi-celled
T/F
F
Eukaryotic cells
-May be single or multi-celled
STRUCTURE OF THE NUCLEUS
-The nucleus contains DNA (making up less than ___% of its mass) , Protein (nucleoprotein), Ribonucleic acid (RNA) –mRNA, tRNA, rRNA
20
Peroxisomes
-Membrane bound organelles similar in size and ultrastructure to ______.
-They contain _______ and _____
lysosomes
oxidases and catalases
Oxidase enzyme leads to the production of ___ useful for ______
While
-Catalase enzyme _________ and has a protective effect by _______
H2O2
killing ingested microorganisms.
regulates H2O2 concentration
oxidizing toxic substances such as phenols and alcohol.
Eukaryotic cell
Within the cytosol, there is a network of
tubules and filaments, collectively known as the _____
cytoskeleton
The plasma membrane conforms to a ________ of membrane structure.
fluid mosaic model
Phospholipid layer
Amphipathic or not?
Amphipathic
Cholesterol
Amphipathic or not?
Amphipathic
The polar heads of phospholipids are mainly derived from ___ conjugated to a ______ compound such as _____,_____, or _______ via a ______ bridge
glycerol
nitrogenous
choline, ethanolamine or serine
phosphate
The non-polar tail of the phospholipid
molecule consists of ______, each _____ linked to the _____ component of the polar head.
two long-chain fatty
acids
covalently
glycerol
Cholesterol molecules are present in the lipid bilayer in an almost ____ ratio with
phospholipids.
1:1
Both the phospholipid and cholesterol
molecules are amphipathic.
T/F
T
_______ molecules make up almost half of the total mass of the phospholipid membrane.
Protein
Most obvious feature of the cell seen
under the light microscope is ——-
Nucleus
Nucleus accounts for about _____ percent of the cell’s volume
10
In general, an eukaryotic cell has only ____ nucleus. However, some eukaryotic cells are _____ cells (without nucleus), for
example, ______; whereas,
some are multinucleate e.g ______
One
enucleate; red blood cells (RBCs)
osteoclasts
The structure of a nucleus encompasses
____,___,____, and _____
nuclear membrane, nucleoplasm,
chromosomes and nucleolus
The nuclear membrane is a _____-layered structure that encloses the contents of the nucleus
double
Nucleoplasm, also known as _____, is
the matrix present inside the nucleus
karyoplasm
Chromosomes are present in the form of strings of _____ and _____ (protein
molecules) called _____.
DNA and histones
chromatin
The Heterochromatin is a (highly or less?) condensed, transcriptionally (active or inactive?) form, mostly
present adjacent to the ______
highly
Inactive
nuclear membrane.
_______ also forms the dense areas in the nucleus
Heterochromatin
Euchromatin is a (delicate or tough?) , (highly or less?) condensed(light or dark?) organization of
chromatin
Delicate
Less
Light
___chromatin is found abundantly in a transcribing cell (active in RNA synthesis)
Eu
The principal organelles involved in protein synthesis are the _______ and the ______
nucleus and the ribosomes
Translation takes place in the _____.
cytoplasm
Mitochondria is not Lipid bilayered
T/F
F
It is
Mitochondria Contain mitochondria DNA
T/F
T
Mitochondrial DNA is
________ inherited
maternally
Mitochondria plays an important role in regulating both _______ and _____
Apoptosis and necrosis
The inner mitochondrial membrane
contains the enzymes of the ____
folded into _____.
This encloses a core ___ space that harbors the bulk of certain ____ enzymes, such
respiratory chain ;cristae
matrix; metabolic
Outside the inner mitochondrial membrane is the
_________, site of _____,
which is, in turn,enclosed by the ______
intermembrane space
ATP synthesis
outer membrane
Proteins are ____ to attain their _____ structure within the rER, ______ bonds are formed and the ____
steps of _______ take place in the rER.
folded; tertiary
intrachain disulphide
first
glycosylation
Proteins are ______ to attain their _____
structure within the rER, ______ bonds are formed and the _____
steps of ________ take place in the rER.
Folded; tertiary
Intrachain disulphide
First; glycosylation
The principal functions of the sER are ___________ and _________
lipid biosynthesis
membrane synthesis and
repair.
The SER in most cells is relatively (sparse or dense?) and primarily exists as the _____ zone from ____ to
_________ moving to the _____.
Sparse
transition
RER; transport vesicles
Golgi
SER in the gonads and adrenals
DENSE OR SPARSE?
With reason
because of steroidogenesis.
The ____ is also responsible for sequestering
intracellular calcium
SER