Which of these may show enzymatic activity?
a. lipids
b. proteins
c. DNA
d. lipids and proteins
e. proteins and carbohydrates
b
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Erica is taking birth control pills that have high levels of estrogen. Which of the following is
true about estrogen?
a. Having high levels of estrogen is a risk factor associated with breast cancer. b. Estrogen moves into the DNA to signal cell division. c. The production of estrogen decreases when females reach puberty. d. All of these are true.
Four of the five answers listed below are targets of the immune system. Select the exception
a. virus b. normal cells c. cancer cells d. bacteria e. debris and dead cells
The thick layers of cells covering and protecting the delicate apical meristem is called the:
a. root cap. b. root hairs. c. pericycle. d. adventitious root. e. radicle.
What is the function of tight junctions?
a. to seal the spaces between cells b. to give the cell its shape c. to allow ions and small molecules to pass between cells d. to allow cells to communicate with each other