Which of the following statements accurately describes the impacts of sickle-cell disease on the body?
A. The misshapen hemoglobin molecules result in an increase in the blood's ability to carry iron, resulting in increased iron stores.
B. Misshapen red blood cells together in capillaries within the kidneys, causing them to swell. This causes abdominal pain.
C. Sickle-cell shaped red blood cells block capillaries surrounding the spleen, resulting in acute chest syndrome.
D. Anemia prevents the immune and lymphatic systems from working properly, resulting in decreased immunity.
Answer: D
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As many as one-half of Earth's plants
A. may already have gone extinct in the last 100 years. B. may be threatened with extinction at present. C. may be considered invasive species. D. are known to be medicinally useful. E. have been shown to be keystone species.
In your Drosophila laboratory, you find a larva that is missing segments Lb, T1, T2, and T3. This larva probably has a mutation in a ___________ gene.
A. pair-rule B. gap C. maternal effect D. segment-polarity E. gap or segment-polarity
If a species has 42 pairs of chromosomes, which value represents the number of combinations of
maternal and paternal chromosome combinations that will be sorted to the poles?
a. 422 b. 242 c. 221 d. 212 e. 842
When a mouse cell and a human cell are fused, the membrane proteins of the two cells become uniformly distributed over the surface of the hybrid cell. This occurs because
A) many proteins can move around within the bilayer. B) proteins are asymmetrically distributed within the membrane. C) all proteins are anchored within the membrane. D) different membranes contain different proteins. E) all proteins in the plasma membrane come from a membrane other than the human or the mouse.