Which U.S. regulatory agency oversees guidelines and laws that govern environmental applications of biotechnology and other sciences?
A) USDA
B) EPA
C) FDA
D) NIH
E) NSF
B
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In the traditional phylogeny (A), the phylum Platyhelminthes is depicted as a sister taxon to the rest of the protostome phyla and as having diverged earlier from the lineage that led to the rest of the protostomes
In the molecular phylogeny (B), Platyhelminthes is depicted as a lophotrochozoan phylum. What probably led to this change? A) Platyhelminthes ceased to be recognized as true protostomes. B) The removal of the acoel flatworms (Acoela) from the Platyhelminthes allowed the remaining flatworms to be a monophyletic clade clearly tied to the Lophotrochozoa. C) All Platyhelminthes must have a well-developed lophophore as their feeding apparatus. D) Platyhelminthes' close genetic ties to the arthropods became clear as their Hox gene sequences were studied.
Has this cell undergone meiosis?
a. yes, because there are no duplicated chromosomes b. no, because homologous chromosomes are present c. yes, because homologous chromosomes are not present d. no, because the diploid number is 2
Rank the following one-base point mutations (from most likely to least likely) with respect to their likelihood of affecting the structure of the corresponding polypeptide
1. insertion mutation deep within an intron 2. substitution mutation at the third position of an exonic codon 3. substitution mutation at the second position of an exonic codon 4. deletion mutation within the first exon of the gene A) 1, 2, 3, 4 B) 4, 3, 2, 1 C) 2, 1, 4, 3 D) 3, 1, 4, 2
During _______________, the nuclear envelope disappears, and the chromosomes become distinct.
a) telophase. b) metaphase. c) interphase. d) anaphase. e) prophase.