Which of the following is mostly performed by bacteria living within the roots of plants in the legume family?
a. nitrification
b. ammonification
c. nitrogen cycling
d. nitrogen fixation
e. nitrogen assimilation
D
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Which of the following is a defining feature of vertebrate nervous system development?
a. Oraganogenesis b. Ectoderm develops into organs c. Ectoderm and endoderm develop into organs d. Ectoderm, endoderm and mesoderm develop into organs e. Neural crest
If Hypothesis 1 (traits are linked) had been correct, what offspring ratios would Mendel have predicted in the F2 generation?
A: All round yellow B: 3 round yellow: 1 wrinkled green C: 3 round green: 1 wrinkled yellow D: 9 round yellow: 3 round green: 3 wrinkled yellow: 1 wrinkled green
Animal diversity is due to variations in the expression of ancient genes in addition to the evolution of new and different genes.
Answer the following statement true (T) or false (F)
Bone marrow is a site where mature immune cells are found.
a. true b. false