How does phosphorus normally enter ecosystems?
A) cellular respiration
B) photosynthesis
C) rock weathering
D) vulcanism
E) atmospheric phosphorous gas
Answer: C
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What is a DNA library?
A. A collection of vectors, each containing a fragment of the original genome B. A complete sequence of the genetic material in an organism C. An electronic file that may be used for additional genetic analysis D. A collection of mRNA from a given cell
The two-factor crosses performed by Mendel support the observation that
A. alleles for a given trait are distributed randomly among an individual's gametes independent of the alleles for other traits. B. traits that are encoded by genes on different chromosomes are never found within the same gamete. C. the F1 generation can display phenotypes in combinations different from those seen in the P generation. D. the F2 generation will only display phenotypes in the same combinations as the P generation. E. self-fertilization of the F1 generation will produce 100% heterozygous plants at both loci.
Which hormones counteract each other in regulating calcium homeostasis?
A. antidiuretic hormone and aldosterone B. atrial natriuretic peptide and aldosterone C. parathyroid hormone and vitamin D (1,25 dihydroxyvitamin D) D. antidiuretic hormone and parathyroid hormone E. antidiuretic hormone and vitamin D (1,25 dihydroxyvitamin D)
Secondary protein structure is dependent on
a. hydrophobic interactions. b. hydrogen bonds between two amino acids. c. covalent linkages between carbons and nitrogens of adjacent amino acids. d. covalent linkages between carbons and oxygens of adjacent amino acids. e. all of these.