Which hypothesis suggests that organic molecules formed near Earth's surface in pools of water?
a. clay hypothesis
b. iron-clay hypothesis
c. organic broth hypothesis
d. prebiotic soup hypothesis
e. iron-sulfur world hypothesis
d
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Why is DNA ligase most active on the lagging strand during DNA replication?
a. The lagging strands contain more short DNA segments than the leading strand, which are joined together by DNA ligase. b. The lagging strand is synthesized more slowly, and DNA ligase speeds up the DNA polymerase. c. The lagging strand synthesizes DNA in the 3' ® 5' direction. d. The lagging strand requires DNA ligase to couple the RNA primer to the Okazaki fragments. e. DNA ligase performs the function of RNA primase on the lagging strand.
Which of the following choices is not descriptive of a fast-twitch muscle fiber?
a. pale in color b. produces ATP by lactate fermentation c. no myoglobin d. many mitochondria
Which autoimmune disease is incorrectly matched with the tissue it affects?
a. lupus ? blood b. type I diabetes ? pancreas c. multiple sclerosis ? nerves d. lupus – pancreas e. lupus – anemia
All aerobic bacterial species have identical electron acceptors in their electron transport systems.
Answer the following statement true (T) or false (F)