Which of the following four statements is false?
a. The location of the centromere is unique for each
chromosome.
b. The bipolar spindle forms during nuclear division.
c. The spindle apparatus is composed of
microtubules.
d. Some microtubules overlap at the spindle equator.
e. None of these are false.
Answer: e
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The Staphylococcus aureus toxins are
A) neurotoxins. B) endotoxins. C) ectotoxins. D) superantigen toxins.
Match the following items with the correct phrases.
_______1. In the nitrogen cycle, bacteria called ____________________ convert atmospheric nitrogen gas into ammonia in the soil. _______2. ____________________ live in the root nodules of legumes such as alfalfa and clover. _______3. ____________________ are capable of converting the nitrogen within a dead plant or animal into ammonia in the soil. _______4. In the nitrogen cycle, soil organisms called ____________________ convert ammonia into nitrites, and nitrites into nitrates. _______5. In the nitrogen cycle, soil organisms called ____________________ convert the nitrogen in nitrates to nitrogen gas in the atmosphere. a. cyanobacteria b. denitrifying bacteria c. nitrifying bacteria d. nitrogen-fixing bacteria e. saprophytes
MacConkey Agar selects for growth of which type of organism?
A) Gram-positive B) Gram-negative
A cell's G + C ratio is associated with which of the following classification methods?
A) phage typing B) biochemical tests C) physical characteristics D) analysis of nucleic acids E) serological tests