A protective layer made of rigid or elastic protein strips surrounding the cell membrane of euglenoids is a
A. flagellum.
B. pseudopodium.
C. pellicle.
D. gullet.
E. cell wall.
C. pellicle.
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The reducing agent during the Calvin cycle is:
A. NADPH. B. ATP. C. oxygen. D. NADH. E. FADH2.
Answer the following statements true (T) or false (F)
1. Two species of three-spined stickleback fish live in a single lake in British Columbia. They are closely related but occupy different niches. They exist nowhere else. These species most likely arose by sympatric speciation from a single species of three-spined stickleback. 2. The pace of evolution may change due to sudden environmental shifts such as climate change. This may result in rapid evolution. 3. The Mexican axolotl (Ambystoma mexicanum) is an amphibian that has a derived mode of development characterized by metamorphic failure. This mode of development results in an entirely aquatic life cycle in which the animal never develops a terrestrial phase. This is an example of paedomorphosis. 4. A modern goal of systematics is to create taxa based on similarity of form and function, regardless of evolutionary relationships. 5. An assumption used for molecular clocks is that neutral mutations accumulate at a rapidly increasing rate over time between two species.
Which of the following is not one of the seven main groups of odors that humans can detect?
a. musk b. floral c. herbaceous d. putrid e. peppermint
The Casparian strip is:
A. a layer of endodermal cells B. a layer of epidermal cells C. the apoplast D. the symplast E. the waxy layer between endodermal cells