In a eukaryotic cell, a gene that is initially transcribed is 1500 nucleotides in length. The mature mRNA for the product is 1200 nucleotides in length. What is the most probable reason for the discrepancy?
A) a mutation that results in a shorter product
B) removal of introns
C) removal of exons
D) mRNA breakage
E) both choices A and D
B) removal of introns
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What gland secretes fructose, which provides energy for sperm, into the seminal fluid?
a. prostate b. seminal vesicles c. bulbourethral d. vas deferens e. epididymus
The lampreys are unusual vertebrates in that they have no
a. eyes. b. jaws. c. gill slits. d. mouth.
When our ancestors were confronted by a saber tooth tiger, the ________ nervous system was responsible for "supercharging" their escape, while the ________ nervous system returned the body systems to normal after escaping the danger
Fill in the blank(s) with correct word
The distinguishing characteristic used to classify the algae into four kingdoms is
A) whether they are single celled or multicellular. B) their cell wall components. C) their storage products. D) their habitat. E) presence or absence of chlorophyll a.