All of the following tumor-suppressor genes inhibit cell division EXCEPT
A. BRCA1.
B. Rb.
C. NF1.
D. p16.
E. Rb and p16.
A. BRCA1.
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Except for a shallow surface layer, the earth's crust is known to be free of microorganisms.
Answer the following statement true (T) or false (F)
Which of the following determines the force production in muscle contraction?
a. the amount of acetylcholine released into the synapse b. the speed of the acetylcholinesterase acting to break down acetylcholine c. the number of myofibers receiving an action potential from the neuron d. the length of the sarcomeres involved in the contraction
The above figure represents which of the following
chromosomal changes:a. inversion b. deletion c. duplication d. translocation e. aneuploidy
You are given a sample of plant tissue and asked to identify the type of tissue and its location in the plant. Using your microscope, you notice two distinct layers of cells. One layer contains cells that are tightly compacted together while the other layer has loosely arranged cells. The cells in both layers contain many chloroplasts. Based on this information, you determine the tissue is
A. vascular tissue from a root. B. vascular tissue from a leaf. C. mesophyll tissue from a leaf. D. ground tissue from a stem. E. mesophyll tissue from a stem.