As a dermatologist trying to help reduce the incidence of skin cancer, which environmental agents known to be associated with skin cancer would you recommend your patients avoid?
A. cadmium
B. benzene
C. nickel
D. arsenic
E. polycyclic aromatic hydrocarbons
F. endocrine disruptors
Ans:
A. cadmium
B. benzene
C. nickel
D. arsenic
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The statement, "There are 628 gray squirrels living on campus," describes the ________ of gray squirrels on campus.
A. ecosystem B. population C. community D. species
Which of the following are characteristics of self-compatible plants?
A. They are physically isolated. B. Their pollinators are common. C. They are wind pollinated. D. Carpels and stamens are on separate plants.
Which of the following choices is a feature of mitosis but not meiosis?
a. does not make exact copies of the original cell b. favors crossing over c. produces clones of parent cell d. has two cell divisions
Which of the following is true of ALL animals?
a. They reproduce asexually. b. They are made up of single and multicellular individuals. c. They have sense organs like eyes and ears. d. They are capable of movement at some stage of their life cycle. e. They can sustain themselves exclusively by photosynthesis.