What is the photopigment in rod cells called?
A. Photopsin
B. Melanin
C. Rhodopsin
D. Opsin
E. Carotene
Answer: C
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Refer to the figure above. The mRNA is smaller than the length of the DNA that codes for it because _____
A) the regulatory regions (exons) of the gene are not transcribed B) post-transcriptional modification removes the introns C) post-transcriptional modification removes the exons D) bases are added to the tail of the primary transcript
A road that dichotomizes is
a. an intersection of two crossroads. b. a road that forks into two roads. c. a road that has numerous entrances and exits. d. a road that leads nowhere.
The specific process by which a caterpillar becomes a butterfly is called
A. cellular differentiation. B. gastrulation. C. metamorphosis. D. involution. E. epigenesis.
What is the last structure that a sperm travels through as it leaves the body?
A. Ureter B. Urethra C. Vas deferens D. Ejaculatory duct E. Epididymis