Many invertebrates have open circulatory systems and their blood is referred to as
a. bile.
b. perilymph.
c. coelomic fluid.
d. pseudolymph.
e. hemolymph.
E
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Which one of the following can lead to changes in chromatin structure and is often associated with activation of transcription?
A. methylation of RNA polymerase B. addition of methyl or acetyl groups to lysines located in the histone tail C. methylation or acetylation of the phosphodiester link between cytosine and guanine D. addition of lysine to CpG sites along the histone tail E. the presence of cytosine and guanine in a repeating sequence in the histone tail
A botanist is studying the growth rings of a redwood tree. She notices that three concentric rings are very thin compared to the surrounding growth rings. What can she deduce from the occurrence of these thin growth rings?
A. The tree developed more apical shoot meristems during that time period. B. The tree may have experienced a drought or had limited access to nutrients during that time period. C. The tree developed more secondary xylem during that time period. D. The tree had ample access to water and other resources during that time period.
Sulfanilamide is an antibacterial drug that inhibits dihydropteroate synthetase, an enzyme that converts para-aminobenzoic acid (PABA) to folic acid (which is required for the synthesis of bacterial nucleic acids)
Sulfanilamide is a structural analog to PABA so most likely is a(n)______________ inhibitor of dihydropteroate synthetase. A. analogic inhibitor B. uncompetitive inhibitor C. mixed inhibitor D. competitive inhibitor E. allosteric inhibitor
Methanogens are classified as ____
a. Crenarchaeota only b. Euryarchaeota only c. Korarchaeota d. Nanoarchaeota e. both Crenarchaeota and Euryarchaeota