Arrange the following in the correct sequence, from earliest to most recent, in which these plant traits originated
1. sporophyte dominance, gametophyte independence
2. sporophyte dominance, gametophyte dependence
3. gametophyte dominance, sporophyte dependence
A) 1 ?? 2 ? 3
B) 2 ? 1 ? 3
C) 3 ? 2 ? 1
D) 3 ? 1 ? 2
D
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The process of transcription in eukaryotes ends when
a. exon shuffling mixes mRNA pieces. b. enzymes recognize a polyadenylation signal in the trailing RNA sequence. c. the RNA introns are cut out by the spliceosome. d. an enzyme adds a guanine-containing cap. e. the RNA exons are spliced together.
At what week of development does the offspring begin to be called a fetus?
a. Week 16 b. Week 8 c. Week 2 d. Week 4 e. Week 32
A large proportion of archaeans are extremophiles, so called because they inhabit extreme environments with high acidity, salinity, and/or temperature. Such environments are thought to have been much more common on the primitive Earth
Thus, modern extremophiles survive only in places that their ancestors became adapted to long ago. Which of the following is, consequently, a valid statement about modern extremophiles, assuming that their habitats have remained relatively unchanged? A) Among themselves, they should share relatively few ancestral traits, especially those that enabled ancestral forms to adapt to extreme conditions. B) On a phylogenetic tree whose branch lengths are proportional to the amount of genetic change, the branches of the extremophiles should be shorter than the non-extremophilic archaeans. C) They should contain genes that originated in eukaryotes that are the hosts for numerous species of bacteria. D) They should currently be undergoing a high level of horizontal gene transfer with non-extremophilic archaeans.
The three components of a neuron include:
A) Dendrites, myelin, cell body B) Dendrites, cell body, axon C) Dentition, cell body, axon D) Dentition, myelin, cell body