How do mitogen-activated protein kinases become inactive?
A. Ras hydrolyzes GTP to GDP.
B. Ligand diffuses away from the ligandbinding
site.
C. Phosphatases remove phosphate groups.
D. Receptor kinases move apart in the
membrane.
C
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A cell has a defect in polyadenylation. The RNA transcripts encoding which type of protein would not be affected by this defect because they are not polyadenylated?
A) histone proteins B) transcription factors C) transmembrane proteins D) DNA binding proteins E) SR proteins
What is the function of the midpiece on a sperm cell?
A) to contain the haploid nucleus B) to propel the sperm forward C) to aid the sperm's penetration of the egg D) to provide energy for movement
Vascular tissue extends through the roots, stems, and leaves of the entire plant.
Answer the following statement true (T) or false (F)
Answer the following questions true (T) or false (F)
1. Reverse transcriptase synthesizes a DNA molecule from an RNA template. 2. The goals of recombinant DNA technology include production of new organisms with useful combinations of traits. 3. Restriction enzymes are useful only on synthetic DNAs.