Homeostasis is the ability of the organisms to maintain a stable internal environment.
a. true
b. false
Ans: a. true
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X inactivation is controlled by
A) the SRY gene. B) the XIST gene. C) the XTASY gene. D) the location of the spindle in mitosis.
Which of the following describes the gel electrophoresis technique?
a. Separating molecules based on their size and charge b. Making multiple copies of DNA for further analysis c. Creating multiple copies and expressions of genes d. Modifying an organism’s DNA to achieve certain traits
The endodermis of a root
a. regulates the transport of water and minerals into the vascular system. b. produces root hairs for the absorption of water and minerals. c. produces lateral roots in woody dicotyledons. d. transports starch to parenchyma cells for storage. e. produces starch in the roots of dicotyledons.
Why might an HIV test be negative within the first two to three weeks of an HIV infection?
A. because there are no symptoms B. because there is no HIV in the blood C. because there are no opportunistic infections yet D. because the CD4 T-cell count is above 500 cells/mm3 E. because there are no detectable levels of HIV antibodies in the blood