Cells change the composition of their plasma membranes as a response to changing environments. In general, colder temperatures reduce the fluidity of the membrane, so cells will produce different molecules to bring the fluidity back to normal
How would the cell change the membrane in response to colder temperatures?
A. increase the amount of saturated triacylglycerols
B. increase the amount of unsaturated fatty acids
C. increase the length of the fatty acid side chains in the phospholipids
Answer B
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You are given an electron micrograph of a bacterial cell. In the micrograph you can clearly see three thin layers of different densities surrounding the cell
Based on the micrograph, you can infer that this cell is ________ and would appear ________ after application of the Gram stain procedure. A) gram-positive / purple B) gram-negative / pink C) gram-positive / pink D) gram-negative / purple
Two researchers suggested in the 1960s that
____ may have been the first informational molecule.
a. DNA b. a protein c. RNA d. a saccharide e. a peptide
Animals most likely evolved most recently from ____.
A. colonial protists B. fungi C. amoebozoans D. algae E. cyanobacteria
What are groups of cells that perform the same function called?
a. molecules b. organs c. plastids d. tissues