Which was common to experiments done by Avery and colleagues as well as Hershey and Chase?
A. Bacterial cells
B. Escherichia coli
C. Virulent bacteriophage
D. Radioactive DNA
E. Radioactive protein
Answer: A
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____ is the most common form of food capture by animals
Fill in the blank with the appropriate word.
Which of the following is a milestone prokaryotic transcription initiation?
a. polymerase synthesizing mRNA in the 5’ to 3’ direction b. formation of a stable hairpin c. opening of the transcription bubble d. polymerase stalling in a region that is rich in A-T nucleotides
Which statement concerning a scientific theory is FALSE?
a. It may suggest practical applications. b. It predicts new facts. c. It is based on a number of hypotheses. d. It is unchangeable. e. It is supported by many observations.
In a well-stratified lake in summer, the subsurface layer of water, which is characterized by a steep and rapid decline in temperature with depth, is called the
A) epilimnion. B) metalimnion. C) hypolimnion. D) benthic zone.