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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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
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