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

Biology & Microbiology

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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).

Biology & Microbiology

________ can usually repair DNA damage caused by ultraviolet light.

A) Photoreactivation B) Ionizing radiation C) DNA replication D) Chromatin remodeling

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology