When amino acids are broken down for energy, ammonia is created, which is converted into _____ and excreted in urine.
a. ammonium
b. uranium
c. urea
d. phosphatase
c. urea
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A signal sequence
A) directs RNA nucleotides to a particular gene. B) attracts tRNAs to an mRNA. C) is the first part of a protein's amino acid sequence that helps to direct it to a certain part of the cell. D) is a coding codon that mutates into a stop codon.
Which of the following respiratory control centers allows you to hold your breath before diving into a
swimming pool?
a. aortic bodies b. carotid bodies c. receptors of the medulla d. the limbic center of the brain e. higher brain centers of the cerebrum
What type of bond is formed between the hydroxyl group of one nucleotide and the phosphate group of an adjacent nucleotide, forming the sugar-phosphate backbone of DNA?
A) glycosidic bond B) phosphodiester bond C) ester linkage D) hydrogen bond E) ionic bond
What is the common name for single celled fungi?
What will be an ideal response?