Enzymes work to speed up a chemical reaction by:
A) increasing the activation energy of the reaction.
B) lowering the activation energy of the reaction.
C) heating up the substrate.
D) attaching coenzymes to the substrate.
E) supplying the energy needed for the reaction.
Answer: B
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Compare and contrast the nuclear envelope and the plasma membrane.
a. The nuclear envelope consists of two concentric phospholipid bilayers while the plasma membrane is only one phospholipid bilayer. Both membranes are selectively permeable and have pores. b. The nuclear envelope consists of two concentric phospholipid bilayers while the plasma membrane is only one phospholipid bilayer. Neither membrane is selectively permeable or has pores. c. Both membranes consist of two concentric phospholipid bilayers, are selectively permeable, and have pores. d. Both membranes consist of two concentric phospholipid bilayers and neither is selectively permeable or has pores.
Retaining the zygote on the living gametophyte of land plants _____
A) protects the zygote from herbivores B) evolved concurrently with pollen C) helps in dispersal of the zygote D) allows it to be nourished by the parent plant
What would be the valence number of electrons in the sulfur atom 3216S?
A. 32 B. 2 C. 8 D. 6 E. 16
Important members of the intestinal microbiota are the strictly anaerobic
A) Enterobacter. B) Bacteroides. C) Pseudomonas. D) Bordetella. E) Legionella.