Which of the following were key events in the evolution of vascular plant leaves? Select all correct choices
A. the conversion of stems (or branches) to
flattened structures
B. the development of apical meristem
identity genes
C. the development of leaf meristematic cells
D. the development of leaf identity genes
A,C,D
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Kisspeptin is a protein (coded for by the KISS-1 gene) that in humans has an important role in initiating secretion of gonadotropin-releasing hormone (GnRH),
a hormone that stimulates the anterior pituitary gland to release other hormones related to reproduction. Endocrinologists are finding that the protein kisspeptin and its receptor are central to sexual maturation at puberty. The receptor for kisspeptin is coded for by the gene GPR54. Given the information above, the product of GPR54 is: A. a steroid. B. an intracellular protein. C. an extracellular protein. D. an amine. E. a transmembrane protein.
A codon is a group of three bases that can specify more than one amino acid.
a. true b. false
________ is the process of creating an RNA copy of the information in DNA
Fill in the blank with correct word.
A microorganism grows in the lab on medium containing mineral salts but no organic compounds. The organism is likely to be a(n)
A) heterotroph. B) autotroph. C) chemotroph. D) chemoheterotroph. E) The answer cannot be determined from the information provided.