What causes the furrow during cleavage?
A) It is a depression caused by the formation of a new cell wall.
B) A ring of contractile protein fibers pinches the cell in two.
C) Connecting proteins that had been binding adjacent cells together now dissolve.
D) A loss of water occurs.
B
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Mosses and ferns produce gametes by the process of
A) binary fission. B) mitosis. C) meiosis. D) cloning. E) gene conversion.
A genetic disease that causes death in infancy and has an autosomal recessive inheritance pattern can persist in a population because: Check all that apply.
_____ it can be passed on to the next generation by a heterozygous carrier. _____ if both parents are carriers, they have a 50% chance of having normal children. _____ only homozygotes for the abnormal allele will have the disease. _____ individuals with one abnormal allele do not show symptoms of the disease.
Which vascular tissue is responsible for conducting water and dissolved minerals in plants?
a. phloem b. xylem c. stems d. roots e. sori
What substance is used in medicine to produce various images of organs and tissues?
A. a colloid B. a tracer C. an emulsion D. a mixture E. a sensor