Animal groups differ in the mechanisms by which heartbeats are initiated. Most arthropods have a
A. neurogenic heart while vertebrates have a myogenic heart.
B. myogenic heart while vertebrates have a neurogenic heart.
C. autonomous heart while vertebrates have a neurally controlled heart.
D. cardiogenic heart while vertebrates have a myogenic heart.
E. neurogenic heart while vertebrates have a cardiogenic heart.
Answer: A
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The obvious advantage of the lactose operon system is that
a. lactose is not needed as energy for bacteria. b. lactose-metabolizing enzymes need not be made when lactose is not present. c. the bacteria will make lactose only in the presence of the proper enzymes. d. milk is not needed for the adult human diet. e. glucose can substitute for lactose in the diet of intolerant persons.
The organisms shown here are examples of _____
1.fruiting bodies of club fungi
2.diploid ascospores resulting from mitosis
3.branching haploid mycelium
4.a multicelled body consisting of fungus and an alga or bacterium
All of the products of the light-dependent
reactions of photosynthesis listed below are used in the light-independent reactions EXCEPT for a. O2. b. electrons. c. NADPH. d. ATP. e. hydrogen protons contributed by NADPH.
The area in the figure marked “A” is likely to
become a. vacuoles. b. Golgi bodies. c. mitochondria. d. chloroplasts in some cells. e. endoplasmic reticulum.