__________, products of master genes, act as long-range signals that diffuse out from a source and form a
concentration gradient. Fill in the blank(s) with the appropriate word(s).
ANSWER: Morphogens
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Photoautotrophs are the only organisms that can incorporate (fix) carbon dioxide into biomolecules.
Answer the following statement true (T) or false (F)
All of the following are model organisms, except
A) Saccharomyces cerevisiae. B) Drosophila melanogaster. C) Caenorhabditis elegans. D) Arabidopsis thialana. E) Homo sapiens.
The type of viral infection in which a virus enters a host cell and then remains dormant (hidden) in a host cell's chromosome is:
a. A rare form of viral infection b. A transgenic infection c. A lytic infection d. A systematic infection e. A lysogenic infection
Water that is filtered out of the blood by the kidneys is returned to the body through the action of aquaporins. Which of the following statements about water balance disorders is scientifically accurate?
A) People with heart failure often swell due to too much water from excess numbers of aquaporins. B) Water retention (too much water) in pregnancy can be due to a decreased number of aquaporins. C) Kidney failure and decreased urine production are due to increased numbers of aquaporins. D) Small amounts of urine are produced by people who inherit a defect in the ability to make aquaporins.