The designation his- refers to
A. the genotype of a bacterium that lacks a functional gene for histidine synthesis.
B. the genotype of a bacterium that has a functional gene for histidine synthesis.
C. the opposite of a hers gene.
D. bacteria that are auxotrophic for histidine.
E. the genotype of a bacterium that lacks a functional gene for histidine synthesis AND bacteria that are auxotrophic for histidine.
E
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Protists and bacteria are grouped into different domains because _____
A) protists eat bacteria B) bacteria are not made of cells C) protists have a membrane-bounded nucleus, which bacterial cells lack D) bacteria decompose protists E) protists are photosynthetic
You are examining the effect of maturation-promoting factor (MPF) in sea urchin cells, which have a diploid number of 36. If you fuse a dividing sea urchin cell with a G1 arrested oocyte, what would be the outcome?
A. The G1 cell would first go through S phase and then mitosis. Its daughter cells would have 36 chromosomes. B. The G1 cell would undergo mitosis and its daughter cells would each have 18 chromosomes. C. The G1 cell would undergo mitosis and its daughter cells would each have 36 chromosomes. D. The G1 cell would enter mitosis, but would likely arrest at the spindle checkpoint because the chromosomes have not been properly replicated.
Which of the following is not a modification to the mRNA?
A) Intron removal B) Promoter binding C) End capping D) Exon splicing
Bronchioles differ from bronchi in that they
A) warm air to body temperature.
B) contain only smooth muscle.
C) filter and humidify air.
D) can have alveoli attached to them.
E) are lined by a ciliated epithelium.