In a particular system, what kind of energy is considered available to do work? Which of the following is correct?
a. Entropy
b. Gibbs energy
c. Willard energy
d. Kinetic energy
Answer: b. Gibbs energy
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Why is DNA sequencing the gold standard for measuring genetic variation?
A. It is the easiest method of identifying genetic variation. B. It uses mutations to detect differences in amino acid sequence. C. It relies on proteins instead of genetic sequence. D. It determines the exact genetic sequence, and thus the absolute variation in a population. E. It is the least accurate, and is not the gold standard.
Which of the following lycophytes is not properly matched to its description?
A. lycopodium: grow low to the ground, have branching stems and leaves that grow in a helical pattern B. selaginella: leaves are held in a single plane giving their branched stems a distinctive appearance; many grow as epiphytes C. quillworts (isoetes): small plants that live along the margins of lakes and streams D. tree-sized lycophytes: possess a vascular cambium; these can still be found today in tropical forests in Africa
Amanda is curious to know how many chromosomes are in each somatic cell of a chicken she was relishing. She looks it up and finds that it has 78 chromosomes. Therefore, a sperm or an unfertilized egg from a chicken would contain ________ chromosomes.
A) 23 B) 39 C) 46 D) 78
Which group of molecules is involved in stopping the cell cycle?
a. positive regulators b. monitory regulators c. negative regulators d. cessation regulators