Which layer of the eye contains an extensive blood supply?
A. lens
B. sclera
C. choroid
D. cornea
E. retina
Answer: C
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You add an unknown phage to a mixture of F+ and F- cells of E. coli and plate out the bacteria. The bacterial colonies that grow are all F-. How can you explain this phenomenon?
A. The phage bound to a receptor on the sex pilus, and therefore only infected the F+ cells (leaving the F- cells alone). B. The phage bound to a receptor on the F- cells, leaving only them alive and allowing the F+ cells to die off. C. The phage integrated (lysogenized) the F- cells, giving them a selective advantage over the F+ cells. D. F+ cells are uniquely susceptible to phage attack for unknown reasons.
With __________, gametes are typically released into water. Fill in the blank(s) with the appropriate word(s)
Some scientists speculate that a gradual climate change led to the mass extinction of dinosaurs. Which of the following statements supports this theory?
A) Large amounts of water vapor were released into the atmosphere, causing long periods of rain that cooled the planet. B) Asteroids from space collided with Earth, heating the surface of the planet. C) Particles released into the air after an asteroid collision prevented the sun's rays from hitting Earth's surface, thereby causing a decline in photosynthesis. D) Magma released from volcanic eruptions increased the temperature of Earth's crust.
Binomial nomenclature is used to name viruses
Indicate whether the statement is true or false