QuestionOwl
Sign In Ask Questions

Biology

How are rna hairpin turns related to transcriptional termination in e. Coli?

The fruit fly Drosophila melanogaster has an allele that confers resistance to DDT and related insecticides. Laboratory strains of D. melanogaster were derived from wild-caught flies in the 1930s (before the widespread use of insecticides) and the 1960s (after 20 years of DDT use). Strains established in the 1930s lack the DDT resistance allele. In contrast, strains from the 1960s show a 37% frequency of the DDT-resistance allele. Which statement is correct? A. Some fruit flies evolved resistance to DDT, allowing them to survive. B. The DDT resistance alleles arose by mutation during DDT use because of selection for pesticide resistance. C. The evolutionary fitness associated with the heritable trait of DDT resistance changed with the widespread use of DDT.

Which short description best describes the body plan of modern sponges? a gel-like consistency with cells interspersed, making up a semi-solid structure an aggregation of cells built around a water canal system a complete gut with an anterior mouth and posterior anus a mouth connected to a blind sac in which digestion occurs a complete gut with one opening serving as both mouth and anus

Which of the following is a true statement? Mucus protects the stomach lining from digestive secretions. Protease breaks down lipids into fatty acids and glycerol. Lipase breaks down proteins in the small intestine. Pepsin is an antibacterial agent that kills some bacteria.

What information can not be obtained from the sequence of a gene?A) Relationship between two species.B) Effects of a mutation on gene function.C) Whether the gene is methylated.D) Amino acid sequence of a gene.

Some photosynthetic bacteria contain the protein bacteriorhodopsin, which absorbs light and pumps protons out of the cell directly. Briefly describe how such a cell could use bacteriorhodopsin and an H+ATPase to make ATP using light.

in what way does carbon water and nitrogen cycle affects climate change

The quest for a physical basis of memory involves a search for a(n) a. flashbulb memory. b. spacing effect. c. mnemonic device. memory trace. e. iconic memory.

You are studying an individual with very low levels of insulin in her blood. Further analysis indicates that cells of her pancreas are producing normal levels of this protein, but it is accumulating in the cytoplasm rather than being secreted from the cells. Which hypothesis makes the most sense to explain this observation?

is a disease that affects the voluntary muscles (those controlled by one's will) in which nerve impulses are impaired, resulting in fatigue, weakness, and difficulties controlling muscles.

3251 - 3260 of 3569