What is characteristic of adult frogs?
a. gills
b. sucking air into their lungs
c. countercurrent exchange
d. pushing air into their lungs
e. drawing water by inhalation across their gills
ANSWER: d
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Adult stem cells are usually
A. differentiated. B. totipotent. C. pluripotent. D. multipotent.
The width of a DNA double helix ____
a. is constant b. is narrower where adenine is present than where cytosine is present c. is wider where purines are present than where pyrimidines are present d. varies randomly e. is wider where pyrimidines are present than where purines are present
Which of the following molecules can be used to generate ATP energy?
A. Carbohydrates B. Amino acids C. Fats D. All of the choices are correct.
Most basidiomycetes are autotrophs that decompose plant debris, especially cellulose and lignin.
Answer the following statement true (T) or false (F)