In allosteric enzyme regulation, which of the following is false about the molecules that can inhibit enzyme activity?
A) They can increase substrate binding.
B) They can cause the active site to have a poor shape for binding substrate.
C) They can bind to a site other than the active site.
D) They cause a change in the enzyme's shape.
Answer: A
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What accounts for the lysis of a bacterial cell in the presence of a membrane attack complex?
A. loss of cytoplasm due to the presence of large channels in the membrane B. unregulated signaling due to the addition of novel proteins to the cell's membrane C. increased osmosis leading to swelling and rupture of the cell D. apoptosis due to the loss of DNA
A protein called actin consists of 376 amino acids. The mRNA for actin must be longer than
A. 125 nucleotides. B. 376 nucleotides. C. 1128 nucleotides D. 3384 nucleotides.
These molecules can directly convert extracellular signals into intracellular signals.
A. G proteins B. Adapter proteins C. Scaffolds D. Second messengers E. Membrane receptors
Which of these statements is true of meiosis?
(A) Meiosis plays a role in growth, reproduction, and repair (B) Meiosis produces gametes that contain one complete haploid set of chromosomes (C) Meiosis occurs after DNA replication (D) Meiosis, followed by cytokinesis, produces two genetically identical daughter cells