In pre-mRNA processing, ____
a. exons are spliced out and used to produce ribosomal subunits
b. introns are spliced out and combined to form complete proteins
c. introns are spliced out and combined in the tRNA
d. exons are spliced out and the introns are combined in the mature mRNA
e. introns are spliced out and the exons are combined in the mature mRNA
e
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What is the role of the corpus luteum during early pregnancy?
A-The corpus luteum nourishes the rapidly growing embryo. B-The corpus luteum protects the fertilized egg during its transport to the uterus. C-It produces the hormones that will support the early pregnancy. D-The fertilized egg will implant in the corpus luteum.
Why do the purple bacteria occupy a thinner layer of the mat that than the green and the cyanobacteria?
What will be an ideal response?
Identify the five main classes of echinoderms. List their characteristics and two representatives of each
class. What will be an ideal response?
Redi concluded from his experiment that
A. maggots arise from decaying meat. B. air is a "vital element" necessary for spontaneous generation. C. living things arise from other living things. D. microorganisms are present in the air.