The toxins of stingrays are destroyed with hot water, therefore they are a type of:
a. protein.
b. carbohydrate.
c. fat.
d. lipid.
e. DNA.
A
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Two extant species of coelacanths and six species of lungfish are members of the ___ lineage
a. Petromyzontoidea b. Chondrichthyes c. Actinopterygii d. Myxinoidea e. Sarcopterygii
Resolution improves when the wavelength of the illuminating light decreases.
Answer the following statement true (T) or false (F)
Lateral meristems
a. are groups of dividing cells. b. are responsible for increases in the width of a stem or root. c. are also called cambia. d. produce secondary growth only. e. include all of these characteristics
Which of the following facts did Hershey and Chase make use of in trying to determine whether DNA or protein is the genetic material?
a) DNA contains phosphorus, whereas protein does not b) DNA contains nitrogen, whereas protein does not c) DNA contains purines, whereas protein includes pyrimidines d) DNA contains sulfur, whereas protein does not