A group of genes, a promoter, and an operator that control transcription, in prokaryotes, is a(n)
a. translational unit.
b. chromosome.
c. ribosome.
d. envelope.
e. operon
Answer: e. operon
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Which muscles contract during a restful expiration?
(a) external intercostals. (b) diaphragm. (c) abdominal. (d) both b and c.
Which of the following was the likely origin of chloroplasts?
a. cyanobacteria b. mitochondria c. extremophiles d. prokaryotes
Methods for determining the linkage group and genetic map in humans involve which of the following?
A) chiasma-type and classical analyses B) DNA markers C) twin spots and tetrad analysis D) zygotene and pachytene DNA syntheses E) tetrad analysis and bromodeoxyuridine
In organelle heredity, which of the following is TRUE?
A) In a reciprocal cross, the offspring will have different phenotypes depending on which phenotype the father has. B) In a reciprocal cross, the offspring will have varied phenotypes depending on which X chromosome is converted into a Barr body. C) In a reciprocal cross, the offspring will always have the phenotype that the mother (egg) has. D) In a reciprocal cross, the offspring will have the phenotype of the mother's genotype. E) In a reciprocal cross, the imprinted gene will always come from the mother.