Viruses are not considered to be alive, yet they share this ability with living cells:
a. They can metabolize food
b. They can evolve
c. They can reproduce on their own
d. They can produce cell membranes
e. They can synthesize proteins
b. They can evolve
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What is the immediate effect of ligand binding to a ligand-gated channel?
A. the flow of ions into or out of the cell B. a conformational change of the channel C. the activation of kinase proteins D. the formation of cyclic AMP
Because of some of the problems with explaining how the first RNA organisms originated, an alternative possibility
has been proposed in which ____.
a. proteins and RNA evolved simultaneously b. DNA existed before RNA c. lipids functioned as enzymes d. a different form of life existed before the RNA world e. viruses functioned as carriers for RNA
Fibrous layer
What will be an ideal response?
The inducer for the E. coli lac operon is allolactose produced by the action of permease on lactose.
Answer the following statement true (T) or false (F)