The "central dogma" of retroviruses is most accurately described as
A) DNA ? protein.
B) RNA ? protein.
C) DNA ? RNA ? protein.
D) protein ? RNA ? DNA ? protein.
E) RNA ? DNA ? RNA ? protein.
E) RNA ? DNA ? RNA ? protein.
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Archaeopteris, the first known tree, had what characteristics?
_____ It occurred in forests. _____ It possessed wood. _____ It reproduced by seeds. _____ It had a eustele. _____ It had a vascular cambium.
The final electron acceptor of aerobic respiration is ________
A) ATP B) oxygen C) lactic acid D) NAD+
Of the following list, flagellated (swimming) sperm are generally present in which groups?
1. Lycophyta 2. Bryophyta 3. Angiosperms 4. Chlorophyta 5. Pterophyta A) 1, 2, 3 B) 1, 2, 4, 5 C) 1, 3, 4, 5 D) 2, 3, 5 E) 2, 3, 4, 5
You are a forensic biologist and have been asked to review the files of an old, unsolved murder case. The autopsy report is missing a lot of important information, but you read that the victim had a thymus gland that was just starting to shrink
Based on this information alone, what can you conclude about the victim? A) He died of natural causes, most likely an autoimmune disease. B) His lymphatic system was infected and being destroyed by an unknown virus. C) He was between 12 and 16 years old. D) He was between 1 and 6 years old.