What happens to the coelom as each phyla of protostomes evolve?
What will be an ideal response?
Protosome ancestors evolved a coelom (body cavity lined with mesodermally derived tissue). The coelom is thought to be lost in flatworms, reduced in mollusks and joint-legged animals, and modified so that it is incompletely lined with mesoderm in rotifers and roundworms.
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Answer the following statements true (T) or false (F)
1. Glycolysis involves 10 enzyme-catalyzed steps, that can be grouped into three phases: energy investment phase, cleavage phase, and the energy liberation phase. 2. The electron transport chain consists of a series of redox reactions in which electrons are transferred to oxygen as the final electron acceptor. 3. Oxygen is an excellent final electron acceptor because of its low electronegativity. 4. NADH and FADH2 donate their electrons to protein complex I. 5. Ubiquinone is also known as coenzyme Q.
Fleshy fruits with hard seed coats, such as cherries,
are more likely to be dispersed by __________ than by other means. a. wind b. adhering to animal fur c. passing through animal guts d. falling to the ground, rotting, and releasing their seeds e. water currents
Which statement is characteristic of endocrine glands?
a. They release chemical signals into synapses. b. They produce chemical signals that are always stimulatory. c. They are controlled by only negative feedback mechanisms. d. They secrete chemical signals in small amounts over short periods of time. e. Their activity is limited to brain tissue.
Both DNA and RNA
A) contain phosphate groups. B) contain the same four types of nitrogen-containing bases. C) are single-stranded molecules. D) have the same five-carbon sugars. E) cannot be present in a cell simultaneously.