A man who does not suffer from sickle-cell anemia but is a carrier of the sickle-cell trait is married to a woman who is also a carrier for the sickle-cell trait. If they have a child, there is a ____ probability of that child suffering from sickle-cell anemia.
A. 0%
B. 25%
C. 50%
D. 100%
B. 25%
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In eukaryotic cells, chromosomes are composed of _____
A) DNA and RNA B) DNA only C) DNA and proteins D) DNA and phospholipids
Answer the following statements true (T) or false (F)
1. Sodium and potassium ions can easily diffuse through the lipid bilayer of plasma membranes. 2. Transport of salts against their concentration gradients is energetically expensive. 3. If you measured the urine concentration of a freshwater fish, you would find that it was more concentrated than its blood. 4. If you measured the urine concentration of a saltwater fish, you would find that it was more concentrated than its blood.
High species richness in the tropics is probably a result of all of the following EXCEPT ______
a. coevolution b. year-round availability of resources c. a benign climate d. high annual rainfall e. seasonality
Which process is responsible for the formation of fingers and toes?
a. gastrulation b. apoptosis c. menstruation d. cleavage e. implantation