In the spring before the leaves come out, maple trees are often tapped to collect sap to make syrup. The sugars were stored in the wood of the tree as starch and then released as temperatures rise above freezing in late winter. The resulting sucrose is released into the vessels that transport water. Which of the following would a person tap to collect sap from a maple tree?
A. phloem
B. collenchyma tissue
C. xylem
D. parenchyma tissue
E. roots
Ans: C. xylem
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A particular triplet of bases in the template strand of DNA is 5' AGT 3'. The corresponding codon for the mRNA transcribed is _____
A) UCA B) UGA C) TCA D) ACU E) either UCA or TCA, depending on wobble in the first base
Translation ends when a stop codon is at the ____ site, allowing a ____ to bind there
a. P; release factor b. A; terminator tRNA c. E; terminator tRNA d. A; release factor e. P; terminator tRNA
A higher protein concentration within the distal portion of capillaries draws water into them through the process of
A. diffusion. B. facilitated diffusion. C. active transport. D. filtration. E. osmosis.
Which of the following is a zoonosis caused by a spirochete?
A) bejel B) leptospirosis C) pinta D) syphilis E) yaws