Diseases that can be transmitted from one person to another are termed
A. symptomatic.
B. clinical.
C. acute.
D. latent.
E. communicable.
E
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Where are the ribosomal subunits assembled in eukaryotes?
A. Nucleus B. Nucleoid C. Nucleolus D. Nuclear envelope
A bacteria contains two copies of the lac operon; one on the bacterial chromosome and one on a plasmid. The lacO site on the chromosomal lac operon is mutated and non-functional whereas the lacO site on the plasmid is functional. What is the most likely outcome for the bacterial cell when glucose is declining and lactose is present?
A. Expression of lac structural genes on the chromosome and plasmid will decrease because two copies of the lacO site are needed for repression of the lac operon. B. Expression of lac structural genes on the chromosome and the plasmid will increase because more repression of the lac operon occurs as glucose decreases. C. Expression of lac structural genes on the chromosome and plasmid will increase because the lacO site does not affect the CAP protein that activates the operon. D. Expression of lac structural genes will not change because the lacO site is not involved in repression of the lac operon.
In Mendel's pea plants, yellow seeds are dominant to green seeds. Purple flowers are dominant to white flowers. Use Y and y for the seed color alleles and P and p for the flower color alleles. Flower color and seed color assort independently. A plant of
unknown genotype with yellow seeds and purple flowers is crossed to a plant with green seeds and white flowers. The offspring all have yellow seeds, but some have purple flowers, and some have white flowers. What is the genotype of the yellow-seeded, purple-flowered plant? A) Yypp B) YyPp C) YYPP D) YyPP E) YYPp
What do we call the first species that invade a new island that has risen from the ocean?
A) pioneer species B) invaders C) climax communities D) commensals