Phylogenetic trees are usually constructed using either a distance-based ________ approach, or a characteristic ________ approach.
Fill in the blank(s) with the appropriate word(s).
phenetic, cladistic
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PFK-1 is _________ by ATP and _________ by ADP
A. activated; activated B. activated; inhibited C. inhibited; activated D. inhibited; inhibited
Which of the following is not true of X-inactivation?
A) It is necessary for dosage compensation. B) It is the cause of calico color in cats. C) The mechanism includes transcription of the XIST gene and chromatin remodeling. D) The XIST RNA is non-coding. E) The master regulatory gene for X-inactivation is sxl or sex-lethal.
In older men, the inability to get or keep an erection firm enough for sexual intercourse is usually the result of injury, disease, or the side effects of medication and is called
A. erectile dysfunction. B. infertility. C. sterility. D. menopause.
Which part of the mitochondrion shown enhances its ability to produce ATP by increasing the surface area of a mitochondrial membrane?
 A) structure A B) structure B C) structure C D) structure D