In a particular DNA sequence, nonsynonymous substitutions occurring at a lower rate than synonymous substitutions would be evidence for
a. neutral evolution.
b. negative selection.
c. genetic hitchhiking.
d. positive selection.
e. mutational bias.
Ans: b
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Complete the following sentence. An intron is _______________________
A. a protein that is clipped out post- translationally B. RNA that is removed during the processing of an RNA molecule and remains inside the nucleus C. part of an intact, mature mRNA that leaves the nucleus D. a transfer RNA that binds to the codon E. a series of amino acids at the end of a new polypeptide that directs transcription to the ER
A(n) ____________________ is made up of a sugar, a phosphate, and a nitrogenous base
Fill in the blank(s) with correct word
Colchicine is an alkaloid derived from plants. What is its effect on chromosome behavior?
What will be an ideal response?
Which statement is TRUE?
A. The lateral swellings form the anterior 2/3 of the tongue, with the sensory innervation from CN V (GVA) and VII (SVA; taste). B. The posterior 1/3 of the tongue (arches 2-4) innervated by CN VIII (sensory; both somatic and taste) and X (SVA and GVA). C. Pharyngeal Arch I forms the copula. D. Pharyngeal Arches II-IV form the tuberculum impar. E. Pharyngeal Arches III and IV form the two lateral and one medial swelling.