Which germ layer forms first?
a. They all form at the same time
b. Mesoderm
c. None of these choices.
d. Endoderm
e. Ectoderm
e
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A particle that consists of nucleic acids surrounded by protein and requires a host organism to replicate is
A. a bacteria. B. a viroid. C. a plasmid. D. a virus. E. a prion.
Chromatin consists of about
A) 10% histones, 30% DNA binding proteins, 30% DNA, and 30% RNA. B) 25% histones, 25% DNA binding proteins, 25% DNA, and 25% RNA. C) 30% histones, 30% DNA binding proteins, 30% DNA, and 10% RNA. D) 10% histones, 10% DNA binding proteins, 70% DNA, and 10% RNA.
A heterozygous organism
A) always shows a recessive trait. B) can't produce gametes. C) has two identical alleles of a gene. D) has two different alleles of a gene.
You are conducting a genetic screen using Caenorhabditis elegans embryos to isolate mutations affecting anaphase (A). Therefore, you need to look for embryos in which
A. sister chromatids are mismatched and therefore fail to separate. B. the centromeres do not move toward the poles. C. the spindle apparatus does not disassemble. D. the poles do not move apart.