Ricin is toxic because it
a. binds to eukaryotic DNA.
b. binds to eukaryotic mRNA.
c. blocks food from entering the cell.
d. inactivates ribosomes.
e. binds to nerve tissue and causes paralysis.
ANSWER: d
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Answer the following statements true (T) or false (F)
1. Most transcription factors active in early development are morphogens. 2. Adult stem cells are always unipotent. 3. The shoot meristem is totipotent. 4. A cell's fate is determined while the cell is differentiating. 5. The molecular structure of invertebrate homeotic genes differs significantly from that of mammals.
A change in nucleotide sequence that results in a change to a stop codon is known
A) nonsense mutation. B) silent mutation. C) missense mutation. D) frameshift mutation. E) transversion mutation.
Carbon 14 radioisotopes decay into stable
a. carbon 13 isotopes. b. nitrogen atoms. c. carbon atoms. d. nitrogen 15 isotopes. e. sodium atoms.
Over 90% of all cells in the nervous system are ____
a. motor neurons b. sensory neurons c. integrator neurons d. interneurons e. glial cells