Natural killer cells destroy target cells by
a. releasing antibiotics, which breakdown the cell membrane.
b. releasing perforin, which creates holes in the cell membrane.
c. releasing histamine, which signals other blood cells to aggregate.
d. releasing lysozyme, which breaks down the cell wall.
e. releasing antibodies, which break down the cell wall.
B
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What are the two main groups of green algae?
A) chlorophytes and chrysophytes B) chlorophytes and charophyceans C) chrysophytes and charophyceans D) chlorarachniophytes and chlorophytes
Which of the following clusters of terms applies when addressing enhancers as elements associated with eukaryotic genetic regulation?
A) trans- and cis-acting, variable position B) cis-acting, variable position, fixed orientation C) cis-acting, fixed position, fixed orientation D) trans-acting, fixed position, fixed orientation E) cis-acting, variable orientation, variable position
Many factors bind around the core promoter to form the eukaryotic initiation complex, but the most important one is ________, which directly binds the TATA box.
A. TFIIH B. TFIID C. TFIIE D. TAF E. TFIIF F. TFIIA G. TFIIB
Female fire beetles, Melanophilia sp., must seek out freshly-burned trees to lay their eggs in so the larvae can feed on the burned wood. What specialized neural structures might you expect these beetles to have to facilitate this behavior?
A. Special, enlarged synapses for rapid synaptic transmission B. Giant brain structures for processing auditory information C. Extra large axons for rapid axonal transduction D. Special sensory structures that can detect signs of fire or burned wood