Which of the following does not accurately describe events in the movement of mRNA from the nucleus to the cytoplasm?
A. Processed mRNA transcripts are
recognized and transported to the cytoplasm
through nuclear pores.
B. Processed mRNA transcripts diffuse
passively down their concentration gradient
across the nuclear membrane.
C. Nuclear pores are large protein complexes
that traverse the nuclear membrane and
control the inflow and outflow of
macromolecules.
D. Primary transcripts must be processed to
mRNA before leaving the nucleus.
B
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A divergence from _____ gave rise to tetrapods
a. ray-finned fishes c. cartilaginous fishes b. lizards d. lobe-finned fishes
Under a microscope you see a tissue consisting
of flattened cells that is a single layer thick, has a basement membrane, tight junctions, and it lines the inner surface of the lungs. This tissue type is
a. simple squamous epithelium. b. simple columnar epithelium. c. stratified squamous epithelium. d. simple cuboidal epithelium. e. stratified cuboidal epithelium
Early primates arose
a. in tropical forests of East Africa. b. in temperate savanna and grassland habitats. c. near rivers, lakes, and streams in the East African Rift Valley. d. in caves with abundant supplies of insects. e. in all of these places.
Protozoa are susceptible to viral attack.
Answer the following statement true (T) or false (F)