Prezygotic reproductive isolation can occur ____.
A. during fertilization
B. during embryo development
C. during fetal development
D. after birth
E. during meiosis
Answer: E
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Which of the following factors is LEAST likely to attract pollinators to a flower?
A. the amount of nectar B. odor C. color of the flower in visible light D. color of the flower in UV light E. taste of the ovules
You have inoculated a Clostridium species into a tube of media. After incubation, you observe that there is no growth, and you remember that Clostridium is an obligate anaerobe. What is the best explanation for the observed lack of growth?
A. There is not enough oxygen for use when toxic oxygen is present. B. There is not enough water in the environment for Clostridium to grow. C. Oxygen in the medium destroys the enzymes needed by Clostridium to undergo aerobic respiration. D. Clostridium does not have enzymes to process toxic oxygen.
anion or cation? potassium
What will be an ideal response?
Lymphocytes ignore which of the following in most
instances? a. cells coated with complement proteins b. cells with antigens on their surface c. “self” cells with MHC markers d. cells with both antigen and self-MHC markers e. cells with damaged or mutant self-MHC markers