What can result in speciation within a few generations?
A. Development of a physical barrier
B. Polyploidy arising in a plant species
C. Postzygotic isolating mechanisms
D. Change in environmental conditions
E. The introduction of a new predator into an area
Answer: B
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Select the pairing that is incorrect
a. disaccharide – two sugar subunits b. monosaccharide – one sugar subunit c. polysaccharide – three (only) sugar subunits d. polysaccharide – three or more sugar subunits
Which of the following describes how facilitated diffusion is powered?
a. Facilitated diffusion is "free of cost." b. Energy is required to do the work of establishing and maintaining a concentration gradient. c. ATP is required directly. d. The sodium-potassium pump powers facilitated diffusion. e. Facilitated diffusion is powered by endocytosis
Alpha helices and beta sheets are characteristic of protein
A) primary structure. B) secondary structure. C) tertiary structure. D) quaternary structure. E) enzymatic structure.
Ligase enzymes are used to covalently bind together pieces of DNA
Indicate whether the statement is true or false