The miR-200 class of miRNAs have what effect on human health?
A. They contribute to Alzheimer's disease.
B. They regulate the heartbeat.
C. They reduce tumor growth.
D. They contribute to cancer formation.
Answer: C
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A breeding experiment that checks for the relationship between the alleles of a single trait is called a ________. a. Punnett square b. None of these choices
c. dihybrid cross d. test cross e. monohybrid cross
The scrotum is a sac-like structure outside the abdomen in which the testes are suspended. Why is this structure essential?
A. Sperm must be closer to the penis to be ejaculated. B. There is not enough space in the abdomen to grow properly. C. Lower temperature is required for normal development of sperm. D. There is too much hormonal influence if they remain in the abdomen.
Oral infections with herpes simplex virus 1 can lie dormant in nerve cells for years, and when a patient becomes stressed, the virus is released, forming cold sores on the lips. Where will the virus be while dormant in the nerve cell?
a. Floating in the nerve cell cytoplasm b. Integrated in the nerve cell chromosomes c. In the nerve cell membrane d. Floating outside of the nerve cell, waiting to reinfect it e. In the blood
Which of the following represents the lowest degree of certainty?
a. hypothesis b. conclusion c. fact d. principle e. theory