Stem cells in red bone marrow give rise to ________ and ________ blood cells
Fill in the blank(s) with correct word
red; white
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Ingested dietary substances must cross cell membranes to be used by the body. This process is known as _____
A) ingestion B) digestion C) hydrolysis D) absorption E) elimination
The protrusible rasping organ in a mollusk's mouth that is used to scrape food from the substrate is:
A. a veliger B. a visceral mass C. composed of nacre D. a radula E. an ammonite
What is true about the lymphatic system?
A. It exhibits peristaltic contractions. B. Fluid moves through the lymphatic system under high pressure. C. It carries all absorbed materials from the stomach and intestines to the liver. D. It is bi-directional. E. It collects fluid that seeps into the tissues and returns it to the blood.
The gene that encodes small-subunit ribosomal RNA is useful for reconstructing the phylogeny of all organisms, because ________
A) the gene is subject to strong stabilizing selection B) the gene's function has stayed unchanged in all organisms C) all organisms have ribosomes with similar composition and structure D) all organisms have the gene E) All of the above.