A gene mutation
a. is a change in the nucleotide sequence of DNA.
b. may be caused by environmental agents.
c. may arise spontaneously.
d. can occur in any organism.
e. is described by all of these.
Answer: e
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The ectoderm, mesoderm, and endoderm are formed during the ____ stage of embryogenesis
A. fertilization B. cellular blastoderm C. syncytial blastoderm D. gastrulation
Which statement is NOT true about the founder effect?
A. Founding members contain a tiny fraction of the alleles found in the original population. B. It is a form of genetic drift. C. It produces a high frequency of some rare alleles in a small isolated population. D. The founder effect occurs when a population is subjected to near extinction and then recovers so that only a few alleles are left in survivors.
________ are chemicals secreted into the space between two nerve cells to transmit a message.
A. Synapses B. Neurotransmitters C. Hormones D. Glia
A nucleolus is
A) the area in a prokaryote where DNA is concentrated. B) an extra nucleus in the cell. C) an area in the nucleus of eukaryotic cells where ribosomes are synthesized and assembled. D) a membrane-bound organelle. E) an area where the nucleus is synthesized.