When grouping organisms, which classification is most general for a particular type of organism?
A. Kingdom.
B. Phylum.
C. Order.
D. Family.
E. Species.
A. Kingdom.
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Why does mismatch repair not lead to mutation upon repair of heteroduplex DNA?
A. The incorrect base is recognized because it is methylated. B. The strand containing the misincorporated base is methylated. C. The strand containing the misincorporated base is not methylated. D. The strand containing the misincorporated base is phosphorylated. E. Actually, mismatch repair does lead to mutation about 50% of the time.
Which of the following is TRUE of both T cells and B cells?
A. They are lymphocytes. B. They recognize specific antigens on the cell surface. C. They have class I MHC molecules on their cell surface. D. They are involved in the humoral immune response. E. All of the responses are correct.
Low-nutrient, oligotrophic waters will usually become stratified and have an anaerobic hypolimnion at certain times of the year.
Answer the following statement true (T) or false (F)
A chemical reactant is one that
A. enters into a chemical reaction. B. is the newly formed molecule. C. is at a point when both sides of the equation are equal. D. during photosynthesis, is one molecule of sugar and six molecules of oxygen.