Which of the following is not a general mechanism that cells use to maintain stable patterns of gene expression as cells divide?
(a) a positive feedback loop, mediated by a transcriptional regulator that activates transcription of its own gene in addition to other cell-type-specific genes
(b) faithful propagation of condensed chromatin structures as cells divide
(c) inheritance of DNA methylation patterns when cells divide
(d) proper segregation of housekeeping proteins when cells divide
(d)
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New world monkeys have all of the following features except
A. they have flat spreading noses. B. they grasp objects with long prehensile tails. C. they evolved in isolation in South America. D. they are all arboreal. E. they have ischial callosities (thickened rump pads).
What are hydrogen bonds?
What will be an ideal response?
Most DNA-based phylogenetic analyses place humans and chimpanzees (including bonobos) as each other's closest relatives, but a persistent minority of studies place gorillas and chimpanzees as sharing a common ancestor that was not a human ancestor
The reason is incomplete lineage sorting, which simply means that ________. A) the ancestral species of all great apes was genetically variable at some loci, and each descendant species lost different random combinations of ancestral alleles B) the labs that sequenced great ape DNA made a simple procedural error C) mitochondrial genes can become unlinked and be inherited by independent assortment D) primate lineages are not completely reproductively isolated and can hybridize E) coding regions of the primate genome are more likely to give false results than noncoding regions such as SINEs
Formation of menisci, such as occurs in a tube filled with water, is an important factor in plant water movement. A meniscus is created by _____
A) the upward pull of gravity on the water column in the tube B) downward pressure from the atmosphere on the topmost layer of water molecules C) the water molecules being pulled upward by adhesion to the air D) the topmost layer of water molecules being pulled downward by the hydrogen bonds to the water molecules below