In an Rh incompatability during pregnancy, the
mother
a. must be positive and her first and second fetuses
positive.
b. must be negative and her first and second fetuses
positive.
c. must be negative and her first and second fetuses
negative.
d. must be positive and her first and second fetuses
negative.
e. and the father must both be negative and the
fetus positive.
Answer: b
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Density-dependent mortality describes a situation in which:
A. seedlings of common species are less likely to be eaten. B. seedlings of rare species are more likely to be eaten. C. seedlings of rare species are more likely to be infected by pathogens. D. seedlings of common species are more likely to be infected by pathogens. E. seedlings have an equal chance of being infected or eaten regardless of density.
The type of bond that exists between amino acids in a protein is a(n) ____ bond
a. peptide b. hydrogen c. ionic d. glycosidic e. primary
Which structural motifs found in transcriptional regulatory proteins is thought to interact with DNA only through the minor groove?
A. homeodomain B. leucine zipper C. ?-barrel D. helix-turn-helix
Which of the following statements is TRUE of small effector molecules?
A. Small effector molecules cause a conformational change in a regulatory protein. B. Small effector molecules can prevent a repressor from binding a gene region. C. Small effector molecules regulate gene transcription. D. Small effector molecules regulate gene transcription by binding a regulatory protein. E. All of the choices are correct.