The offspring from each cross done in Mendel's pea experiments always looked like one of the two parental varieties because:
a) many different genes interacted to produce the parental phenotype.
b) the alleles blended together to produce the phenotype.
c) many different genes interacted to produce the F1 phenotype.
d) each allele affected phenotypic expression.
e) one allele showed complete dominance over the other.
Ans: e) one allele showed complete dominance over the other.
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Which of the following adaptations increase(s) the amount of oxygen that a fish can extract from the surrounding seawater?
A. All of the answer options are correct. B. gills with a large surface area C. very thin lamellae D. countercurrent exchange E. ventilation of the gills with the aid of an operculum
Cilia are built of
A) microorganisms. B) microfilaments. C) micronutrients. D) microtubules.
The enzyme carbonic anhydrase catalyzes the formation of carbonic acid from carbon dioxide and water. Imagine that you have two sealed tubes with carbon dioxide gas above a buffer containing water and carbon dioxide
One tube has carbonic anhydrase and the other does not. After 24 hours, both tubes are at equilibrium. Which statement below accurately describes the conditions in the tubes? A) The tube with carbonic anhydrase will have a lower concentration of carbon dioxide and a higher concentration of carbonic acid than the tube with any enzyme. B) The tube with carbonic anhydrase will have a higher concentration of carbon dioxide and a lower concentration of carbonic acid than the tube with any enzyme. C) The tubes will have equal concentrations of carbon dioxide and carbonic acid. D) The tube with carbonic anhydrase will have a higher concentration of carbonic acid than the tube with any enzyme, but the concentration of carbon dioxide will be the same in both tubes. E) It is not possible to determine the relative concentrations of the products and reactants without more information about carbonic anhydrase, such as the Km. What will be an ideal response?
African sleeping sickness is caused by which pathogen?
A) Giardia lamblia B) Plasmodium falciparum C) Toxoplasma gondii D) Trypanosoma bruceii