In a DNA double helix, each loop of the helix
a. is wound around histone proteins.
b. consists of 10 nucleotides.
c. always contains equal amounts of G and T.
d. contains the sugar-phosphate backbones in the interior of the helix.
e. represents one nucleotide.
A
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A water sample from a hot thermal vent contained a single-celled organism that had a cell wall but lacked a nucleus. What is its most likely classification?
A) Eukarya B) Archaea C) Animalia D) Protista E) Fungi
An example of a pathogen that undergoes rapid changes resulting in antigenic variation is _____
A) the influenza virus, which expresses alternative envelope proteins B) the strep bacteria, which can be transmitted from patient to patient with high efficiency C) human papilloma virus, which can remain latent for several years D) the causative agent of the autoimmune disease known as rheumatoid arthritis E) multiple sclerosis, which attacks the myelinated cells of the nervous system
In general, microtubules disassemble and consequently pull the chromatids to the ends of the spindle
during ____.
a. prophase b. interphase c. anaphase d. metaphase e. telophase
What phylum posses a stomochord?
a. Chordata b. Echinoidea c. Hemichordata d. Holothuroidea e. Urochordata