Which of the following are fishes characterized by a bony skeleton?
a. Ostracoderms
b. Gnathostomes
c. Chondrichthyes
d. Osteichthyes
d. Osteichthyes
Osteichthyes are fishes characterized by a bony skeleton. Gnathostomes include the bony fishes but also the cartilaginous fishes (Chondrichthyes).
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Most of the molecules in cell membranes are
a. proteins. b. carbohydrates. c. lipids. d. phospholipids. e. nucleic acids.
Homologous chromosomes can be matched by their similar structure and function within a nucleus. Which chromosomes making up a genome do not follow the same characteristics of homology?
What will be an ideal response?
Which of the following activities uses microbial biotransformation?
A. Yogurt production B. Sewage treatment C. Production of antibiotics D. Alcohol production
Answer the following questions true (T) or false (F)
1. It is desirable for a classification system to be based on the evolutionary history of the organisms being studied. 2. The earliest evidence of life on Earth dates to about 3.8 billion years ago. 3. The metabolism-first model suggests that a self-replicating RNA molecule was responsible for driving the evolution of the first forms of life.