What is a main function of the structure in the accompanying figure labeled "A"?
a. It controls cell shape.
b. It separates DNA during cell division.
c. It helps nerve cells lengthen.
d. It is found in hair.
e. It helps regulate DNA replication.
ANSWER: b
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The stomach secretion that aids in vitamin B12 absorption is ____
a. pepsinogen b. amylase c. HCl d. gastrin e. intrinsic factor
Which of the following is an appropriate description of a nucleosome?
a) DNA wrapped around a histone octamer b) DNA wrapped around a kinectochore octamer c) DNA wrapped around a shelterin octamer d) DNA wrapped around a binding protein octamer e)DNA wrapped around a histone octamer + linker DNA
Taxol, a secondary metabolite from the bark of the Pacific yew tree, is used as a treatment for
A. high blood pressure. B. breast cancer. C. diabetes. D. headaches. E. indigestion.
Staphylococcus bacteria are commonly present in the human nasal cavity but rarely cause disease of the upper respiratory system. This situation is an example of (commensalism/mutualism/parasitism).
Fill in the blank(s) with the appropriate word(s).