Oligodendrocytes are responsible for myelinating central nervous system axons
Indicate whether the statement is true or false.
T
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Male peacocks have tail feathers that make up about 60% of their body length. During the mating season they shake these feathers in front of females
Longer feathers produce a larger volume of rustling sound for a given shaking rate, but they are also heavier, and thus require more energy to shake at a given rate than shorter feathers. This suggests that ______________. A. selective pressures will continue selection for longer and longer peacock tails B. selective pressures will always result in shorter peacock tails to reduce the energetic cost of shaking C. there are selective pressures against too long or too short of a tail, which results in the variable tail lengths D. tail length is completely random because there are selective pressures both for and against longer tails
Which of the following is most probable at a metaphase I alignment?
a. All maternal chromosomes are on the same side. b. All paternal chromosomes are on the same side. c. Each side has a mixture of maternal and paternal chromosomes. d. Each side consists of half paternal and half maternal chromosomes. e. All of these are equally probable.
Which value(s) would be required to calculate how long ago the most recent ancestor of ungulates lived?
I) the number of base pairs that differ among species in a certain genetic sequence II) the total number of base pairs in the genetic sequence examined III) the age of a fossil ancestor for calibration A) I B) II C) III D) I, II, and III
The polypeptide-making organelles, which consist of protein combined with RNA, are called
A. centrosomes. B. Golgi bodies. C. mitochondria. D. ribosomes. E. lysosomes.