The main center for homeostatic control of the internal environment is the ____.
A. pons
B. medulla oblongata
C. hypothalamus
D. thalamus
E. cerebellum
Answer: C
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Which one of the following is nottrue of tRNA molecules?
A. tRNA molecules are single-stranded RNA. B. The 3'-terminal nucleotide of tRNA is the site of amino acid attachment. C. The anticodon arm of tRNA contains a three nucleotide sequence that is identical to a specific mRNA codon. D. tRNA molecules contain the unusual nucleotides dihydrouridine, pseudouridine, and ribothymine.
Answer the following statements true (T) or false (F)
1. Adult stem cells are always unipotent. 2. A cell's fate is determined while the cell is differentiating. 3. The molecular structure of invertebrate homeotic genes differs significantly from that of mammals. 4. The bicoid gene is a homeotic gene that encodes a transcription factor.
The beating flagellae of ____ maintain a constant flow of water through sponges
a. amoeboid cells b. choanocytes c. sperm d. porocytes e. pinacoderm
A specific stretch of DNA that codes for the amino acid sequence of a polypeptide is called a __________.
A. polypeptide B. gene C. nucleic acid base D. nucleotide