A villus are indicated by the letter ____
a. A
b. B
c. C
d. D
e. E
ANSWER: a
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Myofibrils are subdivided along their length by repeating units called ________, which are the fundamental contractile units of the muscle cell.
Fill in the blank(s) with the appropriate word(s).
Which of the following would not inhibit a cell preparing to undergo mitosis?
A) chromosomal abnormalities B) Cdc-activating kinase activity C) Chk1 inhibtion of Cdc25 D) p21 inhibition of G1 E) environmental signals that no new cells are needed
Which of the following is used to help protect the lungs from infection?
A. The mucociliary escalator moves trapped organisms away from the lungs by ciliary action. B. Coughing and sneezing forcefully expel organisms away from the lungs. C. Turbulent airflow deposits airborne pathogens on sticky mucosal surfaces. D. All of the choices are correct.
Which of these types of chemical bonds would you not expect to find in biological molecules?
a. covalent bonds b. van der Waals forces c. ionic bonds d. hydrogen bonds e. all of these types of bonds are found in biological molecules