In mollusks, ctenidia are necessary for which function?
a. breathing
b. excretion
c. reproduction
d. locomotion
a. breathing
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What are some diseases associated with imprinting?
A. Angelman Syndrome B. LHON C. Alzheimer's Disease D. All of the answers are correct
Proteinacious projections from the surface of a bacterium that are used to mediate conjugation are called sex ________, whereas projections that mediate attachment to surfaces such as host cells are called ________.
Fill in the blank(s) with the appropriate word(s).
Why is the protein-first hypothesis not accepted by most scientists?
a. Proteins cannot be catalysts. b. There is no known mechanism of protein self-replication. c. Of all of the macromolecules, only DNA can self-replicate. d. There is no evidence that proteins can store information. e. Proteins are too complex to have been the first "polymers of life."
The octameric histone core is composed of four different histone proteins, assembled in a stepwise manner. Once the core octamer has been formed, DNA wraps around it to form a nucleosome core particle
Which of the following histone proteins does not form part of the octameric core? (a) H4 (b) H2A (c) H3 (d) H1