A decrease in heart rate and blood pressure results when drugs such as propranolol block or inhibit, receptors in the heart
Answer: beta or adrenergic
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Which of the following contributes to asymmetric cell division in a developing embryo?
A. diffusible molecules secreted from one cell detected by another cell B. developing gradients of mRNA that define critical axes C. cell division occurring perpendicular to the mRNA gradient D. All of the choices are correct.
In a genetic cross, there are n classes of data. What would the degrees of freedom be for a chi-square test on this data?
A. n B. n + 1 C. n - 1 D. 2n + 1 E. x(n) where x equals the number of individuals in the cross
Thyroxine is released from the thyroid gland in response to the presence of
A) ACTH. B) TSH. C) FSH. D) LH. E) GH.
Phylogenetic trees are built using:
a) similarities in the physical structure of organisms. b) similarities in the embryological development of organisms. c) similarities in the DNA sequences of organisms. d) tissue samples. e) a), b), and c) are all correct.