Some prokaryotes attach to other substrates by hairlike outgrowths, which are shorter than flagella. These are called
A. fission products.
B. endospores.
C. plasmids.
D. pili.
E. flagellin.
Answer: D
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All the cells in a cancerous tumor are ____________________ directly descended from one cell
Fill in the blank(s) with correct word
Molecular evidence points to __________ as an
explanation for the great diversity of hormones and hormone receptors in vertebrates. a. polyploidy and nondisjunction b. gene duplications followed by mutations c. continental drift d. chromosomal translocations e. homeotic genes
_______ describes a chromosome that has a centrally-placed centromere. Fill in the blank(s) with the appropriate word(s)
Which of the following structure of a eukaryotic cell is not likely derived from endosymbiotic bacterium?
A. mitochondria DNA B. mitochondria ribosomes C. inner membrane D. outer membrane