In order to reproduce, to what type of wetland must certain species of salamanders migrate so their aquatic eggs can develop free of predatory fish that are unable to survive the annual drying up of this wetland?
A) vernal pond
B) intertidal zone
C) marsh
D) swamp
A
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The Miller and Urey apparatus produced hydrogen cyanide (HCN), formaldehyde (CH2O), and glycine (an amino acid) in their first experiment, why was it important that they use water vapor, methane, carbon monoxide, ammonia and hydrogen as their reactants and an electrical spark as their energy source?
A. They knew these reactants were available in their lab and in today's atmosphere.
B. These reactants were found in today's atmosphere therefore they should be used to try to replicate the early Earth atmosphere.
C. Each of the reactants were readily changed into proteins and DNA.
D. These reactants were useful because their products were able to be predicted before the experiment began, it is always good to know the outcome of an experiment to achieve success with the experiment.
E. These reactants were hypothesized to have made up the early Earth atmosphere, the electricity was used to emulate lightening strikes.
Increases in poly(A) tail length result in increased ____
a. transcription b. translation c. protein stability d. mRNA degradation e. alternative splicing
Chapter 11
24. The chromosomes are aligned at the spindle equator during a. anaphase. b. metaphase. c. interphase. d. prophase. e. telophase
Describe normal embryo formation and two mechanisms of nondisjunction represented in the figure and identify the consequences of these chromosomal anomalies
