The Pacinian corpuscle is important to:
A) sight. B) hearing.
C) information about the position of the joints. D) the sense of touch.
Answer: D
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In a one D process, how many D values would it take to reduce a population of 1010 cells to one survivor?
A. 2 B. 4 C. 5 D. 10
The ____ provides evidence that RNA molecules generated the first proteins
a. redundancy of the genetic code b. ability of rRNA to catalyze the formation of peptide bonds between amino acids c. polymerase activity of some ribozymes d. cleavage of mRNA molecules by rRNA e. physical structure of polypeptides
Which cells are held in reserve to be used for a rapid response to subsequent intruders of the same type?
a. NK cells b. helper T cells c. cytotoxic T cells d. memory cells e. B cells
The strobilus of a spike moss contains:a
an apical meristem. b. both microsporangia and megasporangia. c. microsporangia only. d. megasporangia only. e. a plant embryo.