13. In a developing human embryo, the hands and feet resemble mittens, with cells and tissues present between the fingers and toes. When a baby is born, these cells are not present, resulting in distinct fingers and toes. In the development of fingers and toes these cells were lost by (A) cell division. (B) cell connections. (C) cell morphology. (D) apoptosis.

13. In a developing human embryo, the hands and feet resemble mittens, with cells and tissues present between the fingers and toes. When a baby is born, these cells are not present, resulting in distinct fingers and toes. In the development of fingers and toes these cells were lost by
(A) cell division.
(B) cell connections.
(C) cell morphology.
(D) apoptosis.

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統計： A(0), B(0), C(1), D(0), E(0) #4041834

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考試核心觀念本題測驗的是**胚胎發育中...

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17. Wild type bread mold can grow in a minimal medium without supplements, while certain mutated strains can only grow in a minimal medium that is supplemented with specific intermediates. See the figure below for an overview of the arginine biosynthetic pathway. A strain that can grow in a minimal medium containing arginine, but NOT in minimal media containing citrulline nor in minimal media containing ornithine would have a mutation in the gene that encodes for ________. Precursor $\xrightarrow{\text{Enzyme 1}}$ Ornithine $\xrightarrow{\text{Enzyme 2}}$ Citrulline $\xrightarrow{\text{Enzyme 3}}$ Arginine(A) enzyme 1. (B) enzyme 2. (C) enzyme 3. (D) both enzymes 1 and 3.

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