Stromatolites are
A. the earliest known arthropods.
B. heterotrophs found in marine environments.
C. autotrophs living around deep sea vents.
D. fossilized coral reefs.
E. layered rocklike structures formed by cyanobacteria.
Answer: E
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Virulence refers to the ability of an organism to cause disease
Indicate whether the statement is true or false.
What role is played by tRNA?
a. tRNA provides the mechanism that replaces thymine in DNA with uracil in mRNA. b. tRNA joins its amino acid to the peptide chain when it matches an mRNA codon. c. tRNA unwinds mRNA in advance of the polymerase responsible for transcription. d. tRNA binds to the promoter region and recruits the correct polymerase for transcription.
Brushlike projections from the villi are
a. cilia. b. flagella. c. lymph vessels. d. microvilli. e. rugae.
According to evolutionary theory humans are descended from extant apes.
Answer the following statement true (T) or false (F)