Which of the following statements best describes RNAi techniques for gene silencing?
A) siRNAs block DNA replication.
B) siRNAs inhibit transcription of a gene.
C) siRNAs inhibit mRNA splicing.
D) siRNAs trigger degradation of mRNAs to prevent their translation.
E) siRNAs prevent transport of mRNA from the nucleus to the cytoplasm.
D
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The crown of the tooth is covered by _____, the hardest substance in the human body
a. enamel b. calcium c. bone d. dentin
In most flowering plants, one sperm nucleus fuses with an egg forming a zygote that develops into an embryo. Another sperm nucleus fuses with ____
a. the endosperm mother cell to produce three cells, each with one nucleus b. the endosperm mother cell, forming a diploid cell c. the endosperm mother cell, forming a triploid (3n) cell d. one of the smaller megaspores to produce what will eventually become the seed coat e. one of the smaller megaspores to produce a diploid endosperm
Distinguish between sense and nonsense mutations and describe the characteristics of a protein affected by each type
of mutation. What will be an ideal response?
The part of the brain that regulates the internal environment of the body by linking the endocrine and nervous systems is the
A. thalamus. B. pineal gland. C. hypothalamus. D. amygdala.