Stopping transcription in prokaryotes requires
a. generation of a stop codon.
b. copying a terminator sequence in mRNA.
c. splicing introns out and pasting exons together.
d. activation of gene repressors.
e. generation of a poly-A tail.
B
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It appears that eukaryotic diversity took off around 800 million years ago. Which of the following is thought to be responsible for this?
A. By 800 million years ago, enough time had passed since the arrival of eukaryotes for evolutionary adaptation to take place. B. Eukaryotic organisms first arrived 800 million years ago, so when they did, they quickly diversified. C. Chloroplasts first arrived 800 million years ago. D. Environmental conditions changed 800 million years ago, namely an increase in oxygen and a decrease in sulfide. E. All of the answer options are correct.
What is an example of the inefficient use rather than the waste of a catch? a. Dolphins as a tuna bycatch
b. Overfishing of large fish. c. Catching sharks for their fins only. d. Drift net bycatch.
An ecosystem
a) consists of all of the living and non-living things functioning together in an area b) consists of all the living organisms in a given area c) is composed of all of the abiotic factors that influence living organisms in a given area d) consists of all of the living animals in a given area e) is composed of the plant life and climate of a given area
You are researching the adaptations of a newly discovered mammal that is active mostly at night. Which adaptation to the eye would you expect to find?
A) A reflective choroid behind the retina B) Thicker vitreous humor behind the lens C) Crustacean flattened cornea resulting in farsightedness D) Many individual light-sensitive subunits in each eye E) An eyespot that can only discern light from dark