Modern birds are probably direct descendants of:
A) dinosaurs. B) marsupials. C) iguanas. D) crocodiles.
Answer: A
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Some present-day bacteria use a system of anaerobic respiration characterized by an electron transport chain analogous to that found in aerobic organisms. Which of the following correctly characterizes the anaerobic electron transport chain?
A. It uses oxygen as a final electron acceptor. B. It is embedded in the outer mitochondrial membrane rather than the inner mitochondrial membrane. C. It establishes a proton gradient between the cytoplasm and the extracellular fluid. D. It establishes a proton gradient between the intermembrane space and the cytoplasm. E. None of these answer options accurately characterizes the anaerobic electron transport chain.
One major difference between prokaryotic and eukaryotic genes is that eukaryotic genes can contain internal sequences, called ________, that get removed in the mature message
Fill in the blank(s) with correct word
If a person had the thymus gland removed, which of the following would NOT occur in his or her body?
A) production of B cells B) production of T cells C) maturation of B cells D) maturation of T cells
The poisonous vapor or mist made up of particles from decomposing material around the swamps, which people thought that these vapors caused disease, is known as:
A. Malaria B. Malador C. Matador D. Miasma