When a signal needs to be sent to most cells throughout a multicellular organism, the signal most suited for this is a ___________
(a) neurotransmitter.
(b) hormone.
(c) dissolved gas.
(d) scaffold.
(b)
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In a certain breed of chicken, two genes control color. A dominant allele (I) inhibits the expression of any color gene
(C). The recessive allele (c) results in albinism when homozygous (cc). Give the F2 phenotypic ratio of a cross between a colored chicken (ii CC) with a white chicken (II cc). What will be an ideal response?
Which of the following is a character in
phylogeny? a. number of digits b. DNA sequence for a gene c. amino acid sequence of an enzyme d. number of petals e. all of these
Archaea and bacteria diverged approximately:
A) 3 billion years ago. B) 2 billion years ago. C) 4 billion years ago. E) 10,000 million years ago.
The ____ is not part of the middle ear.
A. incus B. soma C. stapes D. malleus