As an embryo develops, cells become specialized and form different types of tissues and organs by expressing different subsets of their DNA. This process is called:
a. growth
b. development
c. differentiation
d. maturation
e. cloning
c
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Which of the following statements is false regarding amphibolic pathways?
A. Glyceraldehyde-3-phosphate is used as a precursor for amino acid, lipid, and carbohydrate synthesis. B. Glucose is broken down in glycolysis; however, not all of the intermediates in the pathway are utilized as an energy source. Many leave the pathway to serve as precursors for complex molecules. C. Metabolic pathways are amphibolic, that is, catabolism and anabolism are intertwined in order to conserve energy in the cell. D. All organisms use metabolic pathways to synthesize the 20 amino acids necessary for protein synthesis using precursors from catabolic processes. E. Glucose is broken down during glycolysis to pyruvate; however, when glucose is in short supply, pyruvate is used as a precursor in the process of gluconeogenesis.
All DNA sequences are transcribed into RNA
A. true B. false
What is the importance of the Miller-Urey experiment?
a. It showed that molecules crucial to life could be produced biotically. b. It showed that molecules crucial to life could be produced abiotically. c. It showed that molecules not crucial to life could be produced biotically. d. It showed that molecules not crucial to life could be produced abiotically
Shade-tolerant plant species are generally found early in succession and are replaced by hardier, shade-intolerant species
Indicate whether the statement is true or false