Which of the following statements is FALSE?
A) Sister chromatids of the same chromosome are identical.
B) Sister chromatids can be nonhomologous chromosomes.
C) Homologous chromosomes are not necessarily identical.
D) An example of a nonhomologous chromosome pair is paternal chromosome 1 and paternal chromosome 2 in a human.
B) Sister chromatids can be nonhomologous chromosomes.
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Answer the following statements true (T) or false (F)
1. Gamma aminobutyric acid (GABA) is the most common inhibitory neurotransmitter in vertebrates. 2. Ionotropic receptors act by activating G proteins in target cells. 3. Metabotropic receptors act by initiating changes in second messenger systems in target cells. 4. Meningitis is solely a bacterially caused disease. 5. Synaptic vesicles discharge their contents at the axon hillock region.
Death from botulism is usually due to respiratory paralysis
Indicate whether this statement is TRUE or FALSE.
Which branch of this phylogenetic tree identifies Archaea?
a. A b. B c. C d. D e. E
At a certain genetic loci, there are only 3 alleles in a given population. The frequencies of the 3 alleles are represented by p, q and r. If 36% of this population is homozygous for p and 4% homozygous for q, what is the frequency of r in this population?
a) 0.36 b) 0.04 c) 0.2 d) 0.44 e) 0.56