The protein of the bicoid gene in Drosophila determines the _____ of the embryo
A) anterior-posterior axis
B) anterior-lateral axis
C) posterior-dorsal axis
D) posterior-ventral axis
Answer: A
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A toxin that binds specifically to voltage-gated sodium channels in axons would be expected to _____
A) prevent the hyperpolarization phase of the action potential B) prevent the depolarization phase of the action potential C) prevent graded potentials D) increase the release of neurotransmitter molecules E) have most of its effects on the dendritic region of a neuron
Insertions and deletions of single nucleotides:
A. cause nonsense mutations. B. cause frameshift mutations. C. add or delete amino acids to/from the normal polypeptide. D. shorten chromosomes. E. cause cancer.
When did the Earth and other planets of our solar system form?
a. 1.2 billion years ago b. 4.6 billion years ago c. 7.2 billion years ago d. 5 billion years ago e. 13 billion years ago
The tentacles of squids bear hooks, while those of octopus do not
Indicate whether the statement is true or false