Which of the following best explains why bees aren't attracted to red flowers?
A. Bees perceive red as a warning signal.
B. Bees can't see red.
C. Red flowers usually are odorless.
D. Red flowers do not produce nectar.
E. Red flowers are imperfect and do not produce pollen.
B. Bees can't see red.
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It is estimated that humans can produce over 1.5 million different types of antibodies. Which of the following statements regarding this extraordinary variation is INCORRECT?
A. We inherit over 1.5 million different and distinct immunoglobulin genes from our parents at fertilization. B. V and J domains of antibody light chains are randomly joined. C. Random segments of DNA can be removed from antibody genes. D. V and J domains of antibody heavy chains are randomly joined. E. Cytosines in the variable regions of antibody genes can be converted to uracils via hypermutation.
Over ____% of the U.S. population lives within 50 miles of a coastline
a. 10 b. 25 c. 40 d. 50 e. 70
Human cases of complete myostatin deficiency ____
a. are very common b. are quite rare c. have never been identified d. are easy to study e. result from nutritional deficiencies
The structural integrity of bacteria is to peptidoglycan as the structural integrity of plant spores is to _____
A) lignin B) cellulose C) secondary compounds D) sporopollenin