Which of the following nucleotide triplets best represents a codon?
A) a triplet separated spatially from other triplets
B) a triplet that has no corresponding amino acid
C) a triplet at the opposite end of tRNA from the attachment site of the amino acid
D) a triplet in the same reading frame as an upstream AUG
E) a sequence in tRNA at the end
Answer: D
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Which of the following is a typical example of mRNA editing?
A. deamination of cytidine to thymine B. insertion of one or more A residues C. deletion of one or more U residues D. guanosine deaminated to inosine
What is true of the corpus luteum?
A. Secretions of the corpus luteum stimulate LH and FSH secretion. B. Secretions of the corpus luteum prepare the uterus for implantation of the embryo. C. Secretions of the corpus luteum induce maturation of primary oocytes. D. The major hormone secreted from the corpus luteum is estradiol. E. The major hormone secreted from the corpus luteum is LH.
Mammals fill their lungs using a negative pressure mechanism.
Answer the following statement true (T) or false (F)
What group dominated the Carboniferous period and is now burned as coal?
A) Seedless vascular plants B) Algae C) Angiosperms D) Conifers E) Cycads