Match the protist with the supergroup it belongs in
Cryptosporidium
A) Amoebozoa
B) Excavata
C) Chromalveolata
D) Archaeplastida
C) Chromalveolata
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Countercurrent exchange allows for the removal of ____ percent of O2 from water flowing over gills
a. 50?60 b. 60?70 c. 70?80 d. 80?90 e. 90?100
Through a microscope, paired chromosomes are visible within the nuclei of an unidentified cell sample. Which statement about these cells is true?
a. They cells have been damaged by prolonged dehydration and are beginning to die. b. The cells must be prokaryotes because eukaryotic nuclei are opaque to visible light. c. The cells were preparing to undergo cell division when the slide was prepared. d. The cells were collected from a patient suffering from acute celiac disease.
Which of the following contributes to the stability of the DNA double helix?
A) hydrophobic interactions between aromatic bases at the center of the double helix B) hydrogen bonding between the phosphate and sugar groups in the backbone of the double helix C) covalent bonding between complementary purine and pyrimidine bases. D) ionic bonds between the negatively charged phosphate groups and the positively charged pyrimidine bases. E) hydrophobic interactions between aromatic bases at the center of the double helix and ionic bonds between the negatively charged phosphate groups and the positively charged pyrimidine bases
Which substance is most likely an enzyme?
A) proline B) stearic acid C) endopeptidase D) acetylcholine