Ancestors of the Galapagos finches had two different types of seeds to eat on some islands. Some seeds were very small, and required small beaks to handle. Other seeds were very large and required large strong beaks to crack. This led to ____ among the Galapagos finches.
Answer: disruptive selection
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Multiple alleles are common because
A) RNA is an informational molecule, and many sequences are possible for a particular gene. B) proteins are informational molecules, and many amino acid sequences are possible. C) a gene sequence can vary in different ways and still encode a functional protein. D) there are many humans on the planet.
What are the two major types of chromosomes in many eukaryotic organisms?
a. sex and non-sex b. XY and ZZ c. sex and autosomes d. autosomes and ZZ
Please choose the one BEST response for each.
A. neuroglia B. detects a stimulus C. both receives and sends signals from other neurons D. neurotransmitter molecule E. controls muscles and glands F. sodium-potassium pump G. gray matter H. voltage difference across a cell membrane I. voltage difference across a cell membrane that is not receiving stimulation J. dendrite K. brief reversal of the voltage difference across a cell membrane L. a response intensifies the conditions that caused its occurrence M. neuron membrane potential at which gated sodium channels open N. electroencephalography O. positron-emission tomography
A newly sequenced gene is cloned and expressed in a bacterial cell. The bioinformatics databases suggest that this gene produces an enzyme that catalyzes the conversion of carbon dioxide to bicarbonate. After weeks of experiments, a scientist determined
the enzyme has a completely different function. This is an example of ________. A) incorrect qPCR B) incorrect enzyme experiments C) incorrect annotation D) incorrect sequencing E) incorrect BLAST parameters