Giardia intestinalis and Trichomoniasis vaginalis lack ________ and have ________
A) a flagellum / cilia instead
B) mitochondria / an anaerobic metabolism
C) a cell wall / a rigid cell membrane
D) cysts / sporozoites instead
Answer: B
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Which of the following is NOT a characteristic of most animals?
A. They have Hox genes. B. They are heterotrophic. C. They have an extracellular matrix of proteins such as collagen. D. They have cell walls. E. They have a nervous system.
Companion cells function to ________
a. form living tubes for sugar transport b. load sugar into sieve tubes c. photosynthesize and produce sugar d. transport water throughout the plant
The place where pollination occurs is the
a. stigma. b. micropyle. c. anther. d. receptacle. e. style.
DNA consists of two antiparallel strands of nucleotides held together by
A. peptide bonds. B. ionic bonds. C. covalent bonds. D. hydrogen bonds.