Ras mutations involving amino acid 12 may be oncogenic if they
a) Destabilize the protein causing it to fall apart
b) Increase the cleavage rate of bound GTP back to GDP
c) Stabillize the binding of GTP to Ras
d) Block the ability of Ras to interact with its normal downstream targets
Answer: c) Stabillize the binding of GTP to Ras
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Which cell type is responsible for a major component of tissue rejection following an organ transplant?
a. B cells b. plasma cells c. memory cells d. T helper cells e. cytotoxic T cells
Refer to Figure 38-2. The photoperiodic response of the plant in row a suggests:
a. a brief dark period is the light cue that induces flowering.
b. a brief daylight period is the light cue that induces flowering.
c. a long uninterrupted daylight period is the light cue that induces flowering.
d. a long uninterrupted dark period is the light cue that induces flowering.
e. Cannot be determined from the data provided.
In feedback inhibition of a metabolic pathway, where does the inhibitor bind?
- to a substrate or the product of the last reaction - to the enzyme of the first reaction - to the enzyme of the last reaction - to the substrate of the first reaction - to the product of the first reaction
Frederick Griffith discovered
A. transformation. B. transposons. C. the lac operon. D. DNA. E. conjugation.