Which of the following is CORRECT regarding the viral envelope?
A) It contains only viral proteins.
B) It contains only host cell proteins.
C) It is composed of sterols.
D) It is composed of cellular phospholipid membrane, cellular and viral proteins.
E) It is composed of sterols of viral proteins only.
D
Bloom's Taxonomy: Comprehension
Section: Characteristics of Viruses
Learning Outcome: 13.6
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Indicate whether the statement is true or false.
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.
A type ________ survivorship curve is typical of populations in which individuals tend to live out their physiological life span
Fill in the blank(s) with correct word
What moves the human egg through the oviduct?
A) the beating of the egg's cilia B) rhythmic contractions of the oviduct C) rhythmic contractions of the uterus D) the beating of cilia in the oviduct