Give a brief definition of a homeobox
What will be an ideal response?
a highly conserved genetic element that encodes a 60 amino acid sequence with DNA-binding characteristics
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Imagine you are entering a darkened cavern. You are excited, but also a little nervous. Your heart rate quickens, your blood pressure rises slightly, and your digestive system activity decreases as blood is diverted to your muscles—all changes that prepare you should you need to move rapidly. This type of change is an example of:
A. positive feedback control. B. negative feedback control. C. a failure of homeostasis. D. feedforward regulation. E. open loop feedback.
Which of the following is not an accurate statement describing the contributions of researchers to the structure of DNA?
A. Erwin Chargaff determined that the percent of adenine was equal to the percent of thymine and the percent of guanine was equal to the percent of cytosine. B. Watson and Crick used the work of previous researchers, including Chargaff and Franklin to determine the overall structure of DNA with sugar and phosphate components making up the strands with the nitrogenous bases in the interior. C. Rosalind Franklin used X-ray crystallography to determine that DNA was a double helix in shape. D. Alfred Hershey and Martha Chase injected viruses into mice to determine that the inheritable material was DNA and not protein.
The B-I mutation in anthocyanin (red pigments) produces pigmented corn plants, whereas the B mutation in the same gene usually produces nearly unpigmented corn plants when homozygous (B´/B´). When homozygous B-I and B plants are intercrossed, the F1 plants are essentially unpigmented, like the B homozygotes. If this outcome were due simply to the dominance of B to B-I, then a self-cross of the F1 plants (B´/B-I) should generate B-Icolored homozygotes as approximately 1/4 (B-I/B-I) of the F2 progeny. Instead, no F2 are pigmented. Intercrosses of the F2 and of further generations do not restore the pigmented phenotype. What is the term for this type of inheritance?
A) Mendelian inheritance B) organelle genome inheritance C) allelic inheritance D) epigenetic inheritance
A useful scientific hypothesis is one that is:
A) proven. B) testable. C) conclusive. D) accurate. E) abstract.