The emergence of our ancestors' use of fire occurs around 1.8 million years ago
a. true
b. false
Answer: b. false
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Direct selection involves inoculating cells onto growth media on which
A. the mutant but not the parental cell type will grow. B. the mutation will be reversed. C. the nutrients necessary for mutation to occur are present. D. the mutagen is present.
Guard cells
a. surround the stoma. b. control the flow of gases between the interior of a leaf and the atmosphere. c. become turgid when it becomes light if environmental conditions are not too hot or too dry. d. may absorb water from surrounding epidermal cells. e. do all of these.
Consider a population with a constant size Ne = 5,000 that experiences a mutation rate of 0.00005, with an initial F value of 0.15
What is the probability that two alleles selected at random from the offspring of this population will be identical by descent? a. 0 b. 0.15 c. 0.30 d. 0.40 e. None of the above
The lateral movement of transmembrane proteins can be restricted by several different mechanisms. Which mechanism best describes the process by which neutrophils are recruited by endothelial cells?
(a) proteins are tethered to the cell cortex (b) proteins are tethered to the extracellular matrix (c) proteins are tethered to the proteins on the surface of another cell (d) protein movement is limited by the presence of a diffusion barrier