The most common source of genetic variation in sexually reproducing organisms is
A. recombination of alleles through meiosis and fertilization.
B. duplication of genes.
C. duplication of chromosomes.
D. mutation.
Answer: A
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Short-day plants are those that flower only when the night period of a plant is:
A. longer than a defined period B. shorter than 12 hours C. followed by short periods of light interruptions D. less than that in summer E. longer than 12 hours
What is a limitation of mass-spectrometry in proteomics?
a. Mass spectrometry requires access to a particle accelerator. b. Mass spectrometry requires large quantities of protein for accurate results. c. Variations in protein structure caused by disease can be difficult to identify. d. Proteins are destroyed in the process, making results impossible to verify.
In mammals, X chromosome inactivation results in _____
a. a total inactivation of both female X chromosomes b. only the inactivation of the paternal X chromosome in females c. only the inactivation of the maternal X chromosome in females d. the random inactivation of either the paternal or the maternal X in females e. the inactivation of the maternal X chromosome in males
A scientist performs a controlled experiment. This means that
A) the experiment is repeated many times to ensure that the results are accurate. B) the experiment proceeds at a slow pace to guarantee that the scientist can carefully observe all reactions and process all experimental data. C) two versions of the experiment are conducted, one differing from the other by only a single variable. D) one experiment is performed, but the scientist controls the variables.