In what way do birds differ from mammals?

a. They lack clavicles and pectoral muscles.
b. They have 12 pairs of cranial nerves.
c. They have unidirectional airflow through the lungs.
d. They have a closed circulatory system.


c. They have unidirectional airflow through the lungs.

Biology & Microbiology

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Which of the following terms represents a cell that can form any other cell of the organism?

A. Pluripotent B. Totipotent C. Unipotent

Biology & Microbiology

Based on composition similarities, actin can be divided into two major groups: the muscle-specific actins (________-actin) and nonmuscle actins (________- and ________-actin).

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Which of the following is not a type of phagocyte?

A. Lymphocyte B. Kupffer cell C. Neutrophil D. Macrophage E. Monocyte

Biology & Microbiology

What is the correct format for the scientific name of corn?

a. zea Mays b. Zea Mays c. Zea mays

d. Zeamays e. zea mays

Biology & Microbiology