Cells that are located between the seminiferous tubules of the testis and whose function is to produce androgens are called ________
Fill in the blank(s) with correct word
interstitial cells
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Blood vessels that return blood from capillaries back to the heart are
(a) arteries. (b) veins. (c) portal veins. (d) arterioles
Imagine you are entering a darkened cavern. You are excited, but also a little nervous. Your heart rate quickens, your blood pressure rises slightly, and your digestive system activity decreases as blood is diverted to your muscles—all changes that prepare you should you need to move rapidly. This type of change is an example of:
A. positive feedback control. B. negative feedback control. C. a failure of homeostasis. D. feedforward regulation. E. open loop feedback.
In 1964, Nirenberg and Leder used the triplet binding assay to determine specific codon assignments. A complex of which of the following components was trapped in the nitrocellulose filter?
A) ribosomes and DNA B) sense and antisense strands of DNA C) free tRNAs D) charged tRNA, RNA triplet, and ribosome E) uncharged tRNAs and ribosomes
Changes in tool-kit gene expression (i.e. Hox genes) has been important in what events?
A. The diversification of body plans in arthropods. B. The development of the vertebrate jaw. C. The diversification of mollusk body plans. D. All of the above.