The segments of a tapeworm that contain female and male sex organs are called
A. glycocalyxes.
B. scolexes.
C. proglottids.
D. sporocysts.
E. cercariae.
Answer: C
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Which of the following accurately gives the distribution of phenotypes produced from a cross of purple dwarf pea plants that are heterozygous for flower color and plant height?
A. 63 purple dwarf; 28 purple tall; 27 white dwarf; 7 white tall B. 132 purple dwarf; 138 white tall C. 54 purple dwarf; 6 white tall D. 100% purple dwarf E. 27 purple dwarf; 28 purple tall; 31 white dwarf; 29 white tall
After a plasmid has been inserted into a section of DNA and hydrogen bonds have formed between complementary bases, what enzyme ensures the DNA fragments are permanently bonded together with covalent bonds?
a. plasmids b. helicase c. ligase d. restriction enzymes
Humpbacks sometimes employ a unique method of feeding which entails: a. filtering amphipods from the mud
b. head-lunging. c. creating bubble nets. d. constantly skimming the surface of the ocean.
The letter âFâ from the above figure represents
a. complement. b. MHC markers with antigen expressed to the surface of a cell. c. lysosome fusing with a phagosome. d. plasma membranes fusing. e. MHC recycling.