Plant stem cells are able to do which of the following?
A. They grow into leaves.
B. They are mature cells.
C. They are located in the developed part of the vascular tissue.
D. They are undifferentiated cells that can produce new tissues.
E. They are mostly found at the tip of leaves.
D. They are undifferentiated cells that can produce new tissues.
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An enzyme catalyzes a substrate into a final product. When the concentration of the final product is high enough, it binds to a regulatory site on the enzyme
This binding at the regulatory site changes the shape of the enzyme, which prevents it from binding the substrate and prevents formation of more final product. This is an example of a(n) _______________. A. posttranslational modification B. allosteric enzyme C. translational repressor D. methylation
In the United States, most thyroid disorders are caused by ____
a. iodine deficiency b. iron deficiency c. an autoimmune disorder d. insecticides e. a combination of more than one of these
One way to reduce density dependence is
A) dispersal. B) via reduced resources. C) via increased density. D) via increased stress.
Karyotyping
A) shows chromosomes as they appear in metaphase of meiosis II. B) can reveal alterations in chromosome number. C) examines points of crossing over. D) reveals the presence of cancerous genes.