Which term about nucleosomes is false?
A.) found only in mitotic chromosomes
B.) they can be seen in the electron microscope
C.) they represent the first and most fundamental level of chromatic packing
D.) consists of DNA wrapped around 8 histone proteins, plus a short segment of linker DNA
E.) they convert a DNA molecule into a a chromatic thread about one third the length of the initial DNA
Ans: A.) found only in mitotic chromosomes
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Destiny has distal symphalangism - her fingers and toes are stiff, with tiny nails. She looks it up and finds it is an autosomal dominant trait. Since her parents do not have it, she reasons that she has a new mutation. However, if she has children, each of them, assuming her partner does not have the condition, has a(n) ________ probability of inheriting the condition.
A) 1/8 B) 1/4 C) 1/2 D) 0
The division of a bacterial cell occurs as the
A. actin and microtubules constrict the cytoplasm. B. chromosomes are pulled toward the ends of the cell. C. cell wall develops cracks around the equator of the cell. D. new membrane and cell wall materials begin to grow and form a septum.
Diploid means having
a)one complete set of chromosomes. b)three complete sets of chromosomes. c)two complete sets of chromosomes. d)two chromosomes in each somatic cell. e)two chromosomes in each gamete.
Which one of the following incorrectly pairs a vertebrate group with its major evolutionary innovation?
A. Ostracoderms-cartilaginous endoskeleton B. Sharks-teeth C. Dinosaurs-bipedalism D. Placoderms-jaws E. Amphibians-paired lateral fins