DNA is found in its condensed form known as a chromosome in which of the following stages of the
cell cycle?
a. prophase only
b. prophase and metaphase
c. interphase
d. throughout the cell cycle
e. throughout mitosis until late telophase
E
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Plant cells permit ions and small molecules to move between adjacent cells by means of cytoplasmic channels in their
cell walls known as ____.
a. gap junctions b. plasmodesmata c. desmosomes d. cell junctions e. tonoplasts
Which of the following statements concerning cancer
cells is most accurate? a. Oncogenes are part of the regulatory section of a chromosome. b. Tumor cells have lost their inhibition to stop dividing. c. Oncogenes help control runaway cell division. d. Benign tumors usually spread to other body parts. e. Metastasis is the spread of benign tumors.
Which of the following is not an example of goods and services provided by the environment?
A) Raw materials for goods we use every day, such as wood B) Water treatment C) The control of erosion D) All of the above are examples of goods and services provided by the environment.
Nondisjunction in humans can result in
A. 22 pairs of autosomes, an X chromosome and a Y chromosome. B. 22 pairs of autosomes, and two X chromosomes. C. 47 chromosomes. D. 46 chromosomes.