In autumn, leaves fall from deciduous trees as the trees go into a type of hibernation. What is the environmental trigger for these changes?
A) the presence of the harvest moon
B) a decrease in temperature
C) the high temperatures of summer
D) a decrease in the amount of sunlight
Ans: D) a decrease in the amount of sunlight
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Analysis of the genome of Mycobacterium tuberculosis has revealed all the following EXCEPT
A. it has 99.5% homology with the genome of M. bovis. B. it is significantly larger than the genome of M. leprae. C. it is more closely related to M. leprae than to M. bovis.
A consequence of asexual reproduction in a plant is that __________.
A. gametes are produced in large numbers B. a partner is needed for reproduction C. pollen dispersal is critical to survival D. its entire genetic legacy can remain intact
The voice box is also known as the ____
a. pharynx b. trachea c. bronchus d. larynx e. epiglottis
In phi X 174 phage, whose genome is a single-stranded, circular DNA known as the – strand, replication occurs by the rolling circle method. In which order must the events of replication occur?
A) nicking of the – strand, binding of relaxase protein to the 5? end, DNA synthesis of a + strand, separation of + from – strands, circularization of both strands B) synthesis of a + strand, nicking at the origin, binding of protein to the 5? end, DNA synthesis, displacement of the + strand when replication passes the origin, circularization of the + strand C) synthesis of a + strand, nicking of both strands to separate them, recircularization of both strands D) binding of a protein at the origin of the – strand, synthesis of a + strand, release of the + strand