How do archaea differ from bacteria? What will be an ideal response?
ANSWER: For one, archaea are for more likely to be anaerobic. Second, archaea are more closely
related to eukaryotes. Third, archaea are more apt to prefer extreme environments.
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The mechanism by which antigen-reactive cells respond to foreign antigens while ignoring self-antigens is called clonal
A) selection. B) deletion. C) anergy. D) expansion.
The chemical bonds in DNA by which the sugar components of adjacent nucleotides are linked are called
A. hydrogen bonds. B. peptide bonds. C. phosphodiester bonds.
Which of the following statements is not true about phloem transport of sugars?
A. Active transporters move the sucrose into the phloem. B. Removing sugars from phloem increases turgor pressure at the sink. C. Increased sugar concentration causes water to flow into the sieve tube. D. Sugars are transported out of the phloem at the sink. E. Loading of sugars at the source is powered by ATP.
During an allergic reaction, IgE antibodies bind to ____
a. B cells b. T cells c. plasma cells d. mast cells e. neutrophils