Which of the following genera of the Planctomycetales have a stalk as part of their mechanism for attachment to surfaces?
A. Gemmata
B. Planctomyces
C. Priullela
D. All of the choices are correct.
Answer: B
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Why is there free oxygen in the air?
A. Organisms need oxygen to manufacture ATP. B. Free oxygen has been present since the formation of the earth's atmosphere. C. Evaporation of the oceans liberated oxygen. D. It is a by-product of photosynthesis. E. Free oxygen has seeped from cracks in the earth's crust.
In a developing embryo, different cells begin to transcribe different master genes, depending on where they fall within a gradient of ________
a. protein products of embryonic mRNAs b. homeodomains c. temperature d. protein products of maternal mRNAs
The most common use of DNA evidence in legal proceedings is ____________________. Fill in the blank(s) with the appropriate word(s)
Why do some evolutionary biologists have philosophical concerns about using distance methods to construct evolutionary trees?
What will be an ideal response?