The cavity of the sac that will directly enclose
the embryo is indicated by
a. A.
b. B.
c. C.
d. D.
e. E.
B
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Which is a factor in determining which plant type becomes the pioneer species in a primary succession event?
a. the species of plants that preceded it b. the animals that occupy the area c. chance events that affect the order in which pioneer species arrive d. the nature of the existing soils e. the type of disturbance
During the Cambrian,
a. animals started a great adaptive radiation. b. all major groups of animals originated in the seas. c. changes in land masses, climate, and sea level contributed to animal evolution. d. coevolution of predators and prey and of parasites and hosts was a factor in evolution. e. all of these occurred.
A cell that has 36 chromosomes at the start of interphase will have __________ following the conclusion of mitosis in a eukaryote
(A) 18 replication chromosomes (B) 36 single-stranded chromosomes (C) 72 single-stranded chromosomes (D) 18 single-stranded chromosomes
What would happen if snRNAs did not recognize the branch point within an intron?
A. A 3' poly A tail would not be added to the transcript. B. A lariat would not form. C. snRNAs would not base pair with the 5' end of the intron. D. A 5' cap would not be added to the transcript.