Which of the following contributes to protecting the eyes from microbial invasion?
A. tears contain lysozyme and salt.
B. a mucus layer traps and removes microbes.
C. tears mechanically flush particles from the eyes.
D. tears contain lysozyme and salt and mechanically flush particles from the eyes.
E. tears and mucus combine to trap microbes and remove them.
Answer: D
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In DNA replication there are leading and lagging strands, because
A) DNA replication is conservative and a completely new DNA molecule must be made. B) DNA replication is semiconservative and each strand is copied simultaneously in opposite directions. C) the strands of DNA are parallel and are copied in the same direction simultaneously. D) one strand of DNA is copied faster than the other.
The presence of Okazaki fragments demonstrates the antiparallel nature of the double helix
A. true B. false
If you wanted to prevent a cell from entering the lysogenic pathway, which gene controlled by PRM would you target for inactivation?
A) cro B) Q C) cI D) cII E) O
The spinal cord differentiates in such a way that...
A. the dorsal fissure separates the sensory horns from the motor horns B. the intermediate horns exist only at the cervical and lumbar levels. C. the mantle layer is motor while the basal plate is sensory. D. the sulcus limitans lines the central canal. E. the ventral fissure separates the motor horns from eachother