Gnetophytes are of great interest to plant biologists because they have many traits more typical of angiosperms, such as:
A. living xylem cells.
B. wind pollination.
C. double fertilization.
D. few, slow-growing leaves.
E. cones.
C
You might also like to view...
What would happen to a cell if it failed to complete meiosis II?
a. The cell would have the incorrect number of chromosomes to function properly. b. Crossing over would not occur. c. Independent assortment would not occur. d. Cells do not undergo meiosis II.
Exotoxins are ________.
A. antiphagocytic factors B. lipopolysaccharides C. proteins secreted by living bacterial cells D. secretions that always target nervous tissue E. only released after a cell is damaged or lysed
A 9-month-oId infant is seen by a physician because of a persistent skin infection. His white and red blood cell counts are normal. However, immunofixation electrophoresis indicates a low level of IgG. When the infant returns to the physician for a follow-up visit in a month, his IgG level has increased. What condition do these results indicate?
A. Severe combined immunodeficiency B. Transient hypogammaglobulinemia C. Common variable immunodeficiency D. DiGeorge anomaly
An advantage of (attenuated/inactivated/subunit) vaccines is that they usually elicit cell-mediated immune responses.
Fill in the blank(s) with the appropriate word(s).