Four of the five molecules listed below are amino
acids. Select the exception.
a. glycine
b. adenine
c. phenylalanine
d. valine
e. tyrosine
Answer: b
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Which of the following statements about DNA replication is false?
A. The two strands are separated. B. Each existing strand is used as a template for making a new strand. C. Synthesis of both new strands is in the 5' to 3' direction. D. The newly synthesized DNA is packaged into one nucleus, and the original DNA is packaged into another nucleus.
A drawback of the biological species concept is that it cannot be applied to:
A. extinct organisms (e.g., fossils). B. asexual organisms such as bacteria. C. polymorphic species. D. extinct and asexual organisms. E. all of the answer options are correct.
What limits the length of a food chain? What will be an ideal response?
RNA contains the nitrogenous base ________ instead of ________, which is found only in DNA
A) a deoxyribose sugar... a ribose sugar B) uracil... thymine C) uracil... guanine D) thymine... uracil