The white cliffs of Dover are composed mostly of foraminiferans shells. These organisms move by pseudopodia and feed by phagocytosis. Foraminiferan shells are made of which of the following?
a. Cellulose
b. Calcium carbonate
c. Chitin
d. Peptidoglycan
e. Silica
Answer: b. Calcium carbonate
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The type of genetic engineering that involves isolating genes from one species and introducing them into another is called _____ technology
A. Sanger sequencing B. palindromic C. recombinant DNA D. DNA hybridization E. Sanger recombination
In the sweet pea crossing experiment by Bateson and Punnet, the F2 generation had many more offspring with the phenotypes of purple flowers P, long pollen L and red flowers p, round pollen l than expected from independent assortment. This is because
A. in sweet peas, there are always more PL gametes than Pl ones. B. in sweet peas, the alleles for flower color and pollen shape are on the same chromosome. C. there were few recombination events between these genes during meiosis. D. flower color and pollen shape are within the same linkage group. E. All of the statements given are true.
Experiments involving the peptide known as CLAVATA3 were carried out to determine which of the following?
A. the binding properties of CLAVATA3 B. the size of the peptide C. the influence of CLAVATA3 on peripheral zone cell development D. the role of auxin in cell elongation E. None of these choices is correct
In the fossil record, there is evidence that feathers were produced by which of the following?
A. mammals B. birds and some dinosaurs C. birds and some mammals D. birds E. dinosaurs