Which disease CANNOT be prevented via the use of a vaccine generated from an attenuated pathogen?
A) malaria
B) measles
C) mumps
D) rubella
Answer: A
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Gastrulation is an important event in early embryonic development. Which of the following is NOT a result of gastrulation?
A) formation of three embryonic cell layers B) movement and alignment of many embryonic cells C) the formation of a gastrula D) the formation of specialized adult tissues
Trait SpeciesABCDE111011210010310011411111511111600010The table shows the distribution of traits (A-E) in six extant species (1-6). A "0" indicates the ancestral condition, and a "1" indicates the derived condition. Which species has the greatest number of ancestral character states (plesiomorphies)?
A. 1 B. 2 C. 3 D. 4 E. 5 F. 6
Which statement is false?
a. Chaperones are involved in folding proteins, assembling multiprotein complexes, and incorporating cofactors into enzymes. b. The Sec system processes unfolded proteins, and proteins that are already folded are translocated by the Tat system. c. Gram-positive bacteria have more complicated secretion systems than gram-negatives. d. Protein secretion systems are targets for vaccine development.
Although often single celled, protists are clearly different from bacteria because _____.
A) protists can move using extensions of the cell B) the cells of all protists have a nucleus C) protists sense their external environment and respond accordingly D) protists can reproduce E) protists organize into populations