The longer two species have been evolving on their own, the greater the number of _____________________ that accumulate between them.
a) homologous structures
b) genes
c) genetic differences
d) genetic similarities
e) convergences
Answer: c) genetic differences
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Which of the following is part of the innate immune response?
a. antibodies b. vaccines c. natural killer cells d. T cells and B cells
Describe how microtubules and cohesion work together to align the chromosomes along the metaphase plate during the process of sister chromatid cohesion
What will be an ideal response?
An unlabeled signaling diagram for steroid hormones: Fig. 11.8 p. 213, Campbell 8e. A steroid hormone, like estrogen, passes through the plasma membrane and binds to an intracellular protein as shown in the diagram below
This activates a signal-transduction pathway which results in an increased production of a specific protein. Which of the following statements would explain what would occur as a result of the signal pathway represented by the diagram? A) Transfer RNA (t-RNA) would accumulate in high levels because it is not required for protein synthesis. B) Ribosomal RNA (r-RNA) levels would increase because ribosomes are specific for the messenger RNA (m-RNA) with which they bind during transcription of the polypeptide. C) DNA levels would increase in the nucleus as a result of the binding of the hormone-receptor complex with the DNA. D) Messenger RNA (m-RNA) levels would increase in order to be translated into the protein required by the cell.
Which of the following would produce an ecosystem with a small number of trophic levels?
A) an ecosystem with short growing seasons B) coldwater ocean ecosystems C) an ecosystem small in size and biomass D) an ecosystem in which insects are absent