Which of the following is included in the lariat structure?
a. the intron
b. the exon
c. the snRNP
d. the mRNA
Ans: a. the intron
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A scientist is researching a population of blue jays in her city. In order to completely define this blue jay population, she must:
A. determine the size, range, and density of the blue jay population. B. determine the predators and parasites of the blue jay population. C. determine the climates in which the blue jays can survive. D. determine whether the blue jays are r- or K -strategists. E. determine the typical life history for an individual blue jay.
The diameter of a blood vessel will be reduced by the contraction of ________
a. cardiac muscle b. smooth and cardiac muscles c. skeletal and cardiac muscles d. smooth muscle e. skeletal muscle
"I bands" in skeletal muscle are composed of
a. discs to which thin filaments are anchored. b. stacked thick filaments along with parts of thin filaments that overlap both ends. c. thin filaments but no thick filaments. d. thick filaments but no thin filaments. e. discs to which thick filaments are anchored.
Which of the following is a predicted consequence of kinetochores not achieving the correct level of tension from the mitotic spindle?
A) Sister chromatids will no longer be held together at their centromeres. B) All chromosomes will migrate to one pole instead of to two opposite poles. C) Mitosis will not progress beyond metaphase. D) No prediction can be made.