The ___ ___ is responsible for maintaining homeostasis within any cell.
Responses
A cell wallcell wall
B cell membranecell membrane
C endoplasmic reticulum
B cell membrane
A membrane that only "lets" certain molecules in while keeping other molecules out is ___ ___.
Responses
A flexibleflexible
B bilipid layersbilipid layers
C selectively permeable
C selectively permeable
Large molecules and wastes move through the membrane through ____ ______.
Responses
A lipid layerslipid layers
B protein channelsprotein channels
C carbohydrate gates
B protein channels
The first organisms on Earth were mostly likely ________ cells.
Responses
A prokaryoticprokaryotic
B eukaryotic
A prokaryotic
A(n) ________ cell has a nucleus and typical organelles.
Responses
A prokaryoticprokaryotic
B eukaryotic
B eukaryotic
All cells contain ____________.
Responses
A only DNAonly DNA
B only RNAonly RNA
C DNA, RNA, or Both