During translation, a (3-nucleotide) codon in an mRNA transcript is recognized by a(n) ________ that carries with it the corresponding amino acid
a. rRNA anticodon
b. rRNA codon
c. tRNA anticodon
d. tRNA codon
Answer: C
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Sea otters have been used as an example of the "Keystone Species" concept. This means that sea otters
A. are the base of the food chain in their ecosystem. B. are the dominant species in their ecosystem. C. exert a strong influence on the structure and functioning of their ecosystem. D. have been recently introduced and are recruiting other new species to the ecosystem.
Mechanoreceptors are excited by:
a. tissue damage b. temperature change c. chemical energy of specific substances d. light e. pressure, a change in position, or acceleration
The ___________ nuclei are masses of gray matter deep within each cerebral hemisphere, that integrate motor commands to ensure that the proper muscle groups are stimulated or inhibited.
Fill in the blank(s) with the appropriate word(s)
The nematode Caenorhabditis elegans _____
A) is composed of about 1000 cells, in which the developmental origin of each cell has been mapped B) has only a single chromosome, which has been fully sequenced C) has about 1000 genes, each of which has been fully sequenced D) uniquely, among animals, utilizes programmed cell death during normal development