A phosphate group is a compound containing phosphorus ____
a. and calcium attached to a base
b. and sodium attached to a sugar
c. chemically bonded to thymine
d. chemically bonded to four oxygen molecules
e. chemically bonded to three nitrogen molecules
d
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The spiracle in conjunction with a ventral gill in skates and rays is an adaptation that allows them to:
a. be nekton. b. have a bottom existence. c. position their mouth ventrally. d. avoid detection by predators. e. filter feed on plankton.
To make a transgenic Huntington Disease mouse, a copy of the mutant human HD gene was cloned into a vector, and the next step was to _____
1.transfer the vector directly into the foster mother mouse 2.microinject the vector into the nucleus of a fertilized mouse egg 3.transform bacteria using the engineered plasmid 4.insert the sequence into the genome of a virus and infect a mouse with the virus
Which of the following forms the insoluble layer of aromatic alcohols found primarily in woody tissues?
A) hyaluronates B) cadherins C) proteoglycans D) lignins E) pectins
Which of the following help(s) maintain the pressure driving fluid into Bowman's capsule?
a. the renin-angiotensin-aldosterone system b. antidiuretic hormone c. the diameters of the afferent and the efferent arterioles d. the diameters of the proximal and distal tubules