Allele frequencies are always expressed as numbers between
1.2 and 4.
2.1 and 2.
3.3 and 5.
4.1 and 10.
5.0 and 1.
5
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Which of the following is true of the humoral immune response and not true of the cell-mediated immune response? Only the humoral immune response _____
A) involves T cells at some level B) require CD8+ cells for activation C) involves destroying entire cells and not just the pathogen D) uses antibodies as its main weapon
Answer the following statements true (T) or false (F)
1. The movement of DNA polymerase continues unimpeded if a thymine dimer is present in the DNA double helix. 2. Cells are normally limited to one DNA repair system that corrects DNA mistakes. 3. Patients who suffer from xeroderma pigmentosum (XP) have a defective mismatch repair system. 4. Cancers originate from a single cell.
Which of the following is found in both archaeal and eukaryotic genomes?
A) chromatin fibers B) histones C) heterochromatin D) euchromatin E) nuclear envelope
A plant stem would be considered to be
a. a shoot system. b. a tissue. c. a root system. d. a meristem. e. an organ.