Researchers in England found that, for three out of four habitat types they were studying, the most efficient strategy was to create a system of stepping stones linking existing habitat clusters. "Stepping stones" are a type of corridor.
Answer the following statement true (T) or false (F)
True
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Which of the following diseases is NOT normally spread by a common source?
A) measles B) foodborne diseases C) waterborne diseases D) cholera
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 cell type is unique to vertebrates, and distinct from endoderm, mesoderm, and ectoderm?
a. pharyngeal b. neural crest c. oral hood d. notochordal e. cranial
Which types of bacteria are inhibited from growing on Endo agar?
A) Gram-positive bacteria B) Gram-negative bacteria C) Lactose fermenting bacteria D) Nonlactose fermenting bacteria