Through what process do deciduous plants drop their leaves?
A) thigmotropism
B) gravitropism
C) abscission
D) photoperiodism
C
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Which of the following best explains why bees aren't attracted to red flowers?
A. Bees perceive red as a warning signal. B. Bees can't see red. C. Red flowers usually are odorless. D. Both because red flowers are odorless and because bees can't see red. E. All of the other choices provided are incorrect.
The stomatal opening and closing are under the control of ____
a. ethylene b. cytokinins c. auxins d. abscisic acid e. gibberellins
Modern humans (Homo sapiens) coexisted in Europe for thousands of years with which other hominin?
A) Homo neanderthalensis B) Homo erectus C) Homo ergaster D) Homo heidelbergensis
Which of the following statements about PCR is false?
(a) PCR uses a DNA polymerase from a thermophilic bacterium. (b) PCR is particularly powerful because after each cycle of replication, there is a linear increase in the amount of DNA available. (c) For PCR, every round of replication is preceded by the denaturation of the double-stranded DNA molecules. (d) The PCR will generate a pool of double-stranded DNA molecules, most of which will have DNA from primers at the 5? ends.