The viruses that can infect bacterial cells are
A. cold viruses.
B. HIV virus strains.
C. influenza viruses.
D. bacteriophages.
Answer: D
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Given that these two gene loci are very closely linked, the genotypic ratio in the F2 generation should be closest to
In Drosophila, the allele red eyes (bw+) is dominant to the allele for brown eyes (bw). At another gene locus on the same chromosome, the allele for thin wing veins (hv+) is dominant to the allele for heavy wing veins (hv). Flies homozygous for bw and hv+ are crossed to flies homozygous for bw+ and hv to obtain doubly heterozygous F1 progeny. A. 1:2:1 B. 1:1:1:1 C. 9:3:3:1 D. 3:1 Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain? Gather Content · What do you already know about genetic linkage? Consider Possibilities · Consider the different answer options. Which can you rule out? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
According to Fig 9.10, which of the following is NOT responsible for amplifying the signal in a cell responding to adrenaline signaling?
A. the binding of the receptor by adrenaline B. the production of cAMP by adenylyl cyclase C. the activation of protein kinase A by cAMP D. the phosphorylation of proteins by protein kinase A E. All of these choices amplify the adrenaline signal.
Local and long-distance signals in cells will trigger
changes in a. metabolism. b. gene expression. c. growth. d. development. e. any of these.
An element with more or fewer neutrons than the same element as it appears on the periodic table is known as which of the following?
A) isomer B) ion C) buffer D) isotope