Seeds for desert plants often germinate once abscisic acid is washed away from the seed by water. In this scenario, abscisic acid is acting as a/an
A. suspensor.
B. germination-inhibiting compound.
C. hormone to induce the release of sugars from stored starch in the endosperm.
D. hormone that stimulates cell expansion.
Answer: B
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In the tuberculin skin test, what would be the most likely reason why a positive test would NOT necessarily indicate an infection in progress in a patient who was born and grew up in the United States?
A. False-positives occur all the time. This might simply be an example of that. B. The TB skin test is a measure of reactivation of memory T cells. The memory T cells would be formed either during an active infection or would be remnants of a prior infection that may be cleared. Since the memory of the response persists, the test still shows positive, even though the patient is cleared of actual infection. C. Each person in the United States receives the BCG tuberculosis vaccine. This is an attenuated mycobacterium vaccine. The response to this vaccine makes us positive for the TB skin test, even though we may not have actually had a TB infection at any point in our lives. D. A positive TB skin test ALWAYS indicates a current, active infection.
In DNA replication, which type of molecule is a primer?
a. nucleic acid b. lipid c. protein d. carbohydrate e. inorganic
The pigment responsible for photoperiodism is
a. chlorophyll. b. xanthophyll. c. anthocyanin. d. phytochrome. e. phytoerythrin
Gene therapy is a technique in which DNA from one species is inserted into a different species
Indicate whether the statement is true or false