The Earth's early atmosphere
A. was a reducing atmosphere.
B. contained large quantities of ozone.
C. was an oxidizing atmosphere.
D. was similar to today's atmosphere.
A. was a reducing atmosphere.
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Bacterial ribosomes differ from eukaryotic ribosomes in all of the following except
A. they act as sites of protein synthesis. B. they are smaller than in eukaryotes. C. tetracycline and chloramphenicol can bind to bacterial ribosomes. D. they differ in ribosomal proteins. E. they differ in RNA content.
What is the purpose of protonephridia in flatworms?
a. To sense prey b. To exchange gas c. To respond to stimuli d. To regulate fluid balance e. To serve as a structure for sexual reproduction
Bacteria reproduce by an asexual process in which one parent cell gives rise to identical daughter cells.
a. true b. false
With __________, offspring inherit the same number and kinds of genes from one parent.
Fill in the blank(s) with the appropriate word(s).