At the end of cellular respiration, oxygen combine with electrons of a very low energy level. How are the specific
properties of oxygen beneficial to the organism that uses it as a final electron acceptor?
a. Oxygen is highly reactive and readily accepts electrons.
b. Oxygen is strongly electronegative and helps pull the electrons through the electron transport chain.
c. Oxygen allows a maximum output of energy for ATP synthesis.
d. Oxygen is the only molecule that can act as a final electron acceptor.
e. Oxygen is highly reactive and readily oxidizes methane.
ANSWER: c
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Comparisons of genetic information from various invertebrate groups has ____
a. confirmed nearly all classifications that were based on phenotypic resemblances b. provided a complete and final picture of animal phylogeny c. led to a decision to forgo formal classification of animals d. led to a reshuffling of the classification of animals that is still being refined e. confirmed that some invertebrates should be classified as vertebrates
In prokaryotes, the production of a single RNA transcript for a group of related genes is under the control of ________
A) an operon B) enhancers C) a signal transduction pathway D) transcription factors
The final product of transcription, after modifications, is called __________
a. complementary gene sequence b. pre-mRNA c. mature mRNA d. remodeled mRNA e. primary mRNA
Which of the following is characteristic of a eukaryotic ribosome?
A) it contains rRNA B) it consists of large and small subunits C) it functions only to translate mRNA D) all of the choices