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

Biology & Microbiology

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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.

Biology & Microbiology

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.

Biology & Microbiology

The beating flagellae of ____ maintain a constant flow of water through sponges

a. amoeboid cells b. choanocytes c. sperm d. porocytes e. pinacoderm

Biology & Microbiology

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

Biology & Microbiology