If thyroid hormone levels are very high in the blood, what hormone level would be low in the blood?
a. parathyroid hormone (PTH)
b. calcitonin
c. thyroid-stimulating hormone (TSH)
d. inhibin
e. cortisol
c
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Refer to the figure above. Which structure is responsible for stabilizing DNA in its single-stranded form?
A) A B) B C) C D) D
Which of the following is common to both extracellular and intracellular digestion?
A. the ability to phagocytose food particles B. a slow speed of digestion C. the presence of a digestive cavity D. the ability to consume both large and small food items E. None of these characteristics are common to both extra- and intracellular digestion.
Sexual reproduction introduces more genetic variation than does asexual reproduction.
Answer the following statement true (T) or false (F)
Why are mitochondria present in the sperm?
a. To provide energy for the movement of the flagellum b. To provide energy for the acrosome to penetrate the egg c. To provide nutrients for the sperm d. To provide nutrients for the developing embryo e. To provide energy for the maturation of the sperm