One strand of a section of DNA isolated from the bacterium E. coli reads:
5?-GTAGCCTACCCATAGG-3?
A. Suppose that an mRNA is transcribed from this DNA using the complementary strand as a template. What will be the sequence of the mRNA in this region (make sure you label the 5? and 3? ends of the mRNA)?
B. How many different peptides could potentially be made from this sequence of RNA, assuming that translation initiates upstream of this sequence?
C. What are these peptides? (Give your answer using the one-letter amino acid code.)
A. 5?-GUAGCCUACCCAUAGG-3?
B. Two. (There are three potential reading frames for each RNA. In this case, they are
GUA GCC UAC CCA UAG …
UAG CCU ACC CAU AGG …
AGC CUA CCC AUA GG? …
The center one cannot be used in this case, because UAG is a stop codon.)
C. VAYP
SLPIG
Note: PTHR will not be a peptide because it is preceded by a stop codon.
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Some major changes that occurred in horse body size, foot anatomy and tooth morphology are hypothesized to be due to natural selection because of ...
A. changes in global climates which resulted in changing environments from forest to grasslands. B. changes in global climates which resulted in changing environments from grasslands to forests. C. changing climates from dry to wet. D. changing climates from wet to dry. E. increase in reproduction of larger animals due to lack of water in the dry environment.
Birds are considered homeothermic
Indicate whether the statement is true or false
Alternative or different forms of the same gene
are called
a. homozygous. b. chromatids. c. alleles. d. homologous. e. karyotypes
What is the name given to determining evolutionary relationships by looking at one characteristic at a time?
What will be an ideal response?