Rice and its grain relatives, maize, barley, and wheat, diverged from a common ancestor 50 million years ago. However, the chromosomes of these plants demonstrate extensive conserved arrangements of segments. This phenomenon is called
A. expressed sequence equilibrium.
B. contig.
C. synteny.
D. single nucleotide polymorphisms.
E. linkage disequilibrium.
Answer: C
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A point mutation alters
A) a single base. B) a chromosome tip. C) a centromere. D) only a purine.
Of these 4 genotypic classes of offspring, which arose from a parental gamete produced by the F1 females? (Select all that apply.)
In Drosophila, singed bristles (sn) and cut wings (ct) are both caused by recessive, X-linked alleles. The wild type alleles (sn+ and ct+) are responsible for straight bristles and intact wings, respectively. A female homozygous for sn and ct+ is crossed to a sn+ct male. The F1 flies are interbred. The F2 males are distributed as follows:
A) sn+ ct+
B) sn ct
C) sn+ ct
D) sn ct+
Which feature is not characteristic of all living organisms?
A. All have requirements for energy. B. All must participate in one or more nutrient cycles. C. All have ultimate dependence upon the sun. D. All interact with other forms of life. E. All must reproduce inside of organisms of other species.
True or False: Antibiotics inhibiting peptidoglycan synthesis will negatively affect both bacterial and host cells.
What will be an ideal response?