Unit 2 pre-quiz Flashcards
(10 cards)
The extracellular matrix:
1) is synthesized and secreted by cells
2) contains collagen fibers interwoven with proteoglycans
3) is anchored to the cell by ECM proteins and integral membrane proteins
4) all of the above
4
The nuclear lamina:
1) provides structural support
2) regulates gene expression
3) is a filamentous structure inside the nuclear envelope
4) all of the above
4
Some archaebacteria can withstand environmental conditions due to:
1) DNA repair mechanisms
2) branched side chains in phospholipids
3) heat-stable proteins
4) all of the above
4
Water moves via osmosis:
1) throughout the cytoplasm
2) from an area with a low concentration of water to a higher concentration
3) from an area with low osmolarity to an area with high osmolarity
4) from an area with high concentration of water to a lower concentration
4
The organelles which do NOT contain DNA:
1) lysosome
2) nucleus
3) chloroplast
4) mitochondrion
5) all organelles contain DNA
1
What is the difference between primary and secondary active transport?
primary active transport is directly dependent on ATP, while secondary active transport is indirectly dependent on ATP
Halophiles are organisms that require…
high salt concentration
If a single-celled organism is placed in a solution of low osmolarity (a measure of solute concentration), what is most likely to happen?
water will diffuse into the cell
How does the sodium-potassium pump make the interior of the cell negatively charged?
net outward movement of positively charged ions
The peroxisome:
1) has a low internal pH
2) breaks down fatty acids and amino acids
3) synthesizes the centrioles
4) synthesized toxins a a defense mechanism
2
