ZPA cells of the chick embryo produce which morphogen?
A) bicoid B) chicken wing factor
C) sonic hedgehog D) sonic chicken
Answer: C
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Which of the following properties are shared by both bacteria and archaea?
A. Method of DNA compaction B. Ester linkages in fatty acids C. Single, circular chromosome D. Cell wall polysaccharides
Decomposing organic material that releases nutrients into the soil is known as ____
a. clay b. humus c. silt d. hyphae
e. fungusFor which discovery are Watson and Crick famous?
a. determining the presence of nuclein (DNA) in pus cells b. determining the three-dimensional structure of DNA c. determining the role of DNA as the genetic material d. determining what chemical components are in DNA
Which of the following is an antiphagocytic factor of Staphylococcus?
A) protein A B) catalase C) hemolysin D) protein M E) hyaluronidase