for test 4-based on quiz and worksheet Flashcards
What ions are most important in generating action potential in a nerve cell?
Sodium and potassium ions (NA+/K+)
If both parents are carriers of the mutated Cystic Fibrosis gene, what are their chances of a child of theirs having CF?
25%
Proteins that are destined to be secreted by the cell _______.
Are synthesized by ribosomes on the RER and secreted by exocytosis
The transport of substances in vesicles occurs during________.
Endo and exo cystosis during bulk transport
What is needed to transport substances too large to permeate the cell membrane?
vesicles
DNA Polymerase:
synthesizes new DNA
Primase:
sythesizes RNA primers
Helicase:
unwinds the DNA double Helix
DNA Ligase:
rejoins the two strands
The first step in DNA replication is:
breaking the H bonds in the starting DNA
The SER synthesizes _____.
Lipids (fats)
The RER modifies and transports _______.
Proteins
The function of CFTR (cystic fibrosis transmembrane conductor regulator) is to ____.
transport Clloride ions out of the cell
During DNA replication, the leading strand is the newly synthesized strand that ______.
that is synthesized in one continuous segment
What is the ratio of NA+ and K+ ions in a sodium/potassium pump?
3 NA+ out to 2K+ into the cell
the Sodium/potassium pump is what kind of substance?
membrane protein
does the NA+/K+ pump use active or passive transport?
Active-it needs ATP to function
What functions do cells that typically have lots of SER do? (Hint-3 answers)
1-Produce lots of hormones like testosterone and estrogen, 2-produce large amounts of cholesterol, 3-are primarily involved in lipid metabolism
If a red blood cells was placed in a hypertonic solution ________.
What would flow out and the cell would shrivel
osmosis specifically refers to the movement of ________ through the plasma membrane
Water
The function of Primase in DNA replication is to _______.
synthesize an RNA primer
When Polymeras comes to a C then A on the DNA template during replication it adds what to the growing DNA chain?
G and T, Guanine and Thymine
Besides being involved in DNA replication, what do polymerase, primase, ligase, helicase and topoisomerase have in common?
they are all ENZYMES
