Matthew noticed that his house plants were wilting badly. Which cell structure had most likely contracted?
A. cytoplasm
B. cell wall
C. plasma membrane
D. vacuole
D
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As scientists were unraveling the mysteries associated with transcription and translation in eukaryotes, they discovered there was not a one-to-one correspondence between the nucleotide sequence of a gene and the base sequence of the mRNA it codes for
They proposed the genes-in-pieces hypothesis. How can the genes-in-pieces hypothesis be explained? A) Introns are noncoding segments of DNA that are present in the initial transcript, but are removed by splicing. B) Introns are noncoding segments of DNA that are not read or transcribed by RNA polymerase II. C) Exons are noncoding segments of DNA that are not read or transcribed by RNA polymerase II. D) Exons are noncoding segments of DNA that are present in the initial transcript, but are removed by splicing.
Two molecules with identical molecular formulas but that have different structures are called
A. polymers. B. isomers. C. carboyhydrates. D. hydrocarbons. E. ring structures.
Exposure to light _____ melatonin levels
a. raises c. does not affect b. lowers
In India, which age structure category holds the least number of individuals?
a. pre-reproductive b. early reproductive c. late reproductive
d. early post-reproductive e. late post-reproductive