How do ray-finned fish keep from sinking?
a. they are constantly swimming
b. they don’t constantly swim but their fins
are constantly moving
c. they have lungs that are always filled with
air
d. they have a swim bladder that is filled with
gas
e. they have a skeleton that is less dense than
the surrounding water
D
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All of the following occur during endospore germination except
A. binding of a small organic molecule to initiate germination. B. enzymes digest the endospore cortex. C. dehydration of the cell components. D. the cell grows out of its protein coats.
While studying chromosomes with an electron microscope, you identify a structure that resembles a tangled web of beaded strings. What are the strings in this structure?
a. histones b. nucleosomes c. DNA molecules d. transcription factors
A sterile hybrid plant can form a fertile new species if its chromosomes are doubled. This is referred
to as
a. allopatric speciation b. cladogenesis c. a hybrid zone d. anagenesis e. sympatric speciation
Labeled, known, short stretches of DNA used to detect a specific sequence of nucleotides in a mixture are known as ________.
A. biotechnology B. genetic engineering C. recombinant DNA D. gel electrophoresis E. gene probes