What is a plant’s main line of defense against
viral infection?
a. immune system cells
b. viral toxins within the central vacuole
c. membrane proteins that latch onto virus
particles
d. a thick cell wall that prevents viral entry
e. a nuclear membrane that is impermeable to
viruses
D
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Pneumatic bones are associated with which phyla?
a. reptiles b. birds c. amphibians d. bony fishes
Which of the following is NOT found in
compact bone?
a. concentric layers of extracellular matrix b. blood and nerve canals c. yellow marrow d. red marrow e. all of these are found in compact bone
A gene that affects, prevents, or masks the expression of a gene at another locus is a(n) __________
gene. a. recessive b. dominant c. epistatic d. codominant e. plieotropic
Which of the following statements is NOT true about Fred Griffith's experiments?
a. Mice injected with smooth (S) bacteria die. b. Mice injected with heat-killed smooth bacteria die. c. Mice injected with heat-killed smooth bacteria and d. Mice injected with rough bacteria live. e. Smooth bacteria are transformed into harmless rough live rough (R) bacteria die.bacteria.