The total number of different three-base combinations of the four nucleic acid bases is:
a. 12.
b. 16.
c. 20.
d. 64.
e. 256.
d
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Consider the structure of a trophic pyramid when answering the following questions:
As shown in Figure 25.16, animals only appear in the fossil record about 580 million years ago, which coincides with atmospheric oxygen levels reaching a threshold needed by animals to breathe. How did the evolution of photosynthetic and heterotrophic organisms change over the last 2 billion years to support the diversity of life seen on Earth today? What will be an ideal response?
Deuterostomes are split into the Ecdysozoa and the Lophotrochozoa
____________________ Indicate whether the statement is true or false.
Which of the following statements is true about specialized transduction?
A) Specialized transduction occurs in all bacteriophage except the temperate phages. B) A bacteriophage may at some point become reactivated, excise itself and surrounding bacterial genes from the genome, and begin to build new phage particles. C) Specialized transduction requires that bacteriophage infect at least two different cells to be carried out. D) Bacteriophage undergoing specialized transduction integrate their DNA into a random region of the host cell's genome. E) Specialized transduction always directs the production of new phage particles immediately upon infecting the host bacterium.
Which of the following mechanisms is not directly involved in inactivating an activated RTK?
(a) dephosphorylation by serine/threonine phosphatases (b) dephosphorylation by protein tyrosine phosphatases (c) removal of the RTK from the plasma membrane by endocytosis (d) digestion of the RTK in lysosomes