Phagocytic white blood cells digest many of the invasive bacteria that enter the human body. How could a bacterial cell enter a white blood cell in order to be digested?
A) facilitated diffusion
B) active transport
C) exocytosis
D) endocytosis
D
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Most known plant viruses have ________-strand RNA genomes, because small genomes ________
A) negative / facilitate cell-to-cell transfer B) positive / facilitate cell-to-cell transfer C) negative / interact more readily with host DNA D) positive / interact more readily with host DNA
The term ________ is used to describe a mutually beneficial association in which the growth of an organism is dependent on one or more growth factors, nutrients, or substrates provided by another organism in the same vicinity.
Fill in the blank(s) with the appropriate word(s).
Mendeleev found that when he arranged the known elements according to their atomic mass, the entries in the table exhibited a pattern of chemical properties that repeated itself in groups of eight elements. This led to the generalization now known as:
A. an atomic model. B. valance electrons. C. the periodic table. D. the octet rule.
Old stories tell of gigantic sea serpents, possibly ancient reptiles called plesiosaurs. To prove that they still exist, the most useful scientific evidence would be which of the following?
A) Good photographs of the creatures B) Reliable eye-witness accounts of seeing them C) Unexplained bite marks on fish D) A fresh skull with flesh still attached