A male is tested for cellular abnormalities. The technician notes that there are two Barr bodies present within each of the patient's cells. This indicates that his chromosome complement is most likely
A) XY.
B) XO.
C) XXX.
D) XXY.
E) XXXY.
Answer: E
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In order for a tumor cell to metastasize, which of the following would you expect to happen?
A. a decrease in cadherin expression and an increase of integrin expression B. an increase of cadherin expression and a decrease in integrin expression C. an increase in both cadherin and integrin expression D. a decrease in both cadherin and integrin expression
Which of the following pairs of general transcription factors are released after transcription is initiated?
A. TFIIE and TFIIH B. TFIIF and TFIIH C. TFIID and TFIIE D. TFIID and TFIIH E. TFIIE and TFIIF
Homeotic gene products _____
a. flank a bacterial operon b. map out the overall body plan in embryos c. control the formation of specific body parts
Why does the microbiota of the reproductive tract change as the female ages from childhood to adulthood to old age?
A. The microbes in the vagina change the environment, which affects the populations of microbes living there. B. The pH of the vagina changes over time. C. Post-menopausal women have a stable microbiota. D. Her estrogen and progesterone levels change over time. E. All of these statements are true.