In trying to determine whether DNA or protein was the genetic material, Hershey and Chase made use of which of the following facts about these two types of molecules?
A. DNA contains phosphorus, whereas protein does not.
B. DNA contains nitrogen, whereas protein does not.
C. DNA contains sulfur, whereas protein does not.
D. DNA contains purines, whereas protein includes pyrimidines.
Ans: A. DNA contains phosphorus, whereas protein does not.
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Imagine a red blood cell leaving the right ventricle of your heart. To which chamber of the heart will that cell return first?
A. right atrium B. right ventricle C. left atrium D. left ventricle E. impossible to say from information given
The Casparian strip of the endodermis stops water from the ____ before it reaches the stele
a. symplastic pathway only b. transmembrane and symplastic pathways c. transmembrane pathway only d. apoplastic, transmembrane, and symplastic pathways e. apoplastic pathway only
Sexual reproduction
a. leads to uniform characteristics in a population. b. results in new combinations of genetic traits. c. produces genetic clones. d. requires less tissue differentiation than asexual reproduction. e. produces genetic clones and requires less tissue differentiation than asexual reproduction.
The breakup of Pangaea probably caused sympatric speciation in many animals.
a. true b. false