What is the name of the muscle that helps move air in and out of the lungs?
A) trachea
B) alveolus
C) diaphragm
D) bronchus
Answer: C
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Giant cells are
A. a fusion of B cells. B. a fusion of T cells. C. used to contain bacterial infections. D. activated T helper cells. E. a fusion of T cells AND used to contain bacterial infections.
Four of the five answers listed below are portions of the theory of natural selection. Select the
exception. a. variation is heritable b. heritable traits vary in adaptability c. more organisms are produced than can survive d. the largest and strongest always contribute more genes to the next generation e. natural selection is the result of differential reproduction
Pollen likely evolved in response to plants moving to drier land
Indicate whether the statement is true or false
For each of the following sentences, fill in the blanks with the best word or phrase selected from the list below. Not all words or phrases will be used; each word or phrase should be used only once
The cell cycle consists of an alternation between __________________, which appears as a period of dramatic activity under the microscope, and a preparative period called __________________, which consists of three phases called __________________, __________________, and __________________. During M phase, the nucleus divides in a process called __________________, and the cytoplasm splits in two in a process called __________________. The cell-cycle control system relies on sharp increases in the activities of regulatory proteins called __________________, or __________________, to trigger S phase and M phase. Inactivation of __________________ is required to exit from M phase after chromosome segregation. APC G2 phase metaphase Cdks interphase microtubules condensation intraphase mitosis cyclin-dependent kinases kinesins myosins cytokinesis M phase S phase G1 phase M-Cdk S-Cdk G1-Cdk meiosis Fill in the blank(s) with correct word