With respect to RNA processing, which of the following is false?
A) It leads to the production of alternative gene products.
B) Some introns are removed by spliceosomes.
C) Some introns are self-splicing.
D) Prokaryotic mRNAs are polyadenylated at the 3' end.
E) Chemical modification occurs with tRNA transcripts.
D) Prokaryotic mRNAs are polyadenylated at the 3' end.
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The fossil records indicates that ________ lived in families of male-female pairs, used fire, and left evidence of social cooperation (lived communally).
A) Homo habilis B) Australopithecus C) Dryopithecus D) Homo erectus
In your biology lab, you use a stereoscopic microscope to observe a living animal that uses only one opening to both take in its food and eject its waste products. What is the body arrangement of this animal?
A. gastrovascular cavity B. incomplete digestive tract C. complete digestive tract D. complete digestive tract and a gastrovascular cavity E. incomplete digestive tract and a gastrovascular cavity
A retrovirus such as HIV contains.
A) RNA and enzymes for its conversion. B) a double strand of DNA. C) many enzymes to control budding of new virions. D) numerous mitochondria.
Which blood vessels have the thinnest walls?
A) arterioles B) veins C) venules D) capillaries