In Arabidopsis, the floral meristem is organized into four concentric whorls of cells, each of which gives rise to a specific organ of the mature flower. The floral meristem is therefore analogous to what cells or tissues in animals?
A. totipotent stem cells
B. cells in the morula
C. the inner cell mass of the blastula
D. the germ layers of the gastrula
E. None of these choices is correct.
D
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What is the pH of a solution that contains 0.2 M H2CO3 (carbonic acid) and 0.2 M NaHCO3? The pKa of carbonic acid is 6.4
A. 6.7 B. 6.4 C. 6.0 D. 5.8 E. 5.3
Select the correct sequence (beginning to end) for the multi-step process of gene expression:
a. transcription, gene, mRNA, protein b. RNA, transcription, protein, gene c. RNA, translation, protein d. gene, translation, protein e. gene, transcription, mRNA, translation, protein
Who played the most influential role in discovering the importance of the nucleus?
a. Matthias Schleiden b. Theodor Schwann c. Robert Hooke d. Rudolf Virchow
The anterior pituitary produces hormones that stimulate other endocrine glands to produce their secretions. What stimulates the anterior pituitary to release its hormones?
What will be an ideal response?