What two tissues transport materials throughout the entire plant body?
a. sclerenchyma and xylem
b. phloem and xylem
c. parenchyma and xylem
d. sclerenchyma and collenchyma
e. epidermis and xylem
b
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NAD+ contains the B vitamin ________ as part of its structure, whereas FAD contains another B vitamin, ________, as part of its structure.
Fill in the blank(s) with the appropriate word(s).
________ can usually repair DNA damage caused by ultraviolet light.
A) Photoreactivation B) Ionizing radiation C) DNA replication D) Chromatin remodeling
During a cough, what is responsible for constricting the size of the trachea?
A) closure of the soft palate B) cartilage C) smooth muscle D) epiglottis E) skeletal muscle
The class of antibody known as IgA is
A. Found in the mucous found in the respiratory, intestinal and genito-urinary tracts B. capable of crossing the placenta from mother to fetus C. It is formed of a single unit (monomer) of antibody molecule D. It works only against viruses infecting the upper respiratory tract