Unikonta is a supergroup that includes all of the following except _____
A) fungi
B) protists
C) animals
D) plants
D
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In a mutant E. coli strain, there was a mutation in the malate dehydrogenase gene that resulted in a stop codon at amino acid position 14. From subcultures of this strain, a colony was obtained that was capable of making malate dehydrogenase. Your approach to examining this phenomenon should be to examine
A) the DNA sequence to see if a reversion has occurred. B) the DNA sequence to see if a suppresor mutation has occurred. C) other proteins to see if other stop codons are ignored, indicating the presence of a suppresor tRNA. D) the DNA and plasmids for the incorporation of a second complete copy of the malate dehydrogenase gene. E) all of the above
Signal-recognition particle RNA is involved in directing the ribosome-mRNA-polypeptide complex to
the rough ER. __________________ Indicate whether the statement is true or false.
In DNA,
a. G pairs with T and A pairs with C. b. G pairs with A and C pairs with T. c. G pairs with C and A pairs with T. d. G pairs with C and U pairs with A.
Organisms that are resident microbiota are best described as
A. microorganisms that remain with the person throughout life. B. any microorganisms that cause disease. C. organisms that are present in or on the body for a short time without causing harm. D. microorganisms that may cause a disease under certain circumstances. E. microorganisms that never cause disease.