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

Biology & Microbiology

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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.

Biology & Microbiology

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.

Biology & Microbiology

Which vascular tissue is responsible for conducting water and dissolved minerals in plants?

a. phloem b. xylem c. stems d. roots e. sori

Biology & Microbiology

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

Biology & Microbiology