How are processed mRNAs exported from the nucleus to the cytoplasm?
a. Eukaryotic transcription mechanically ejects mRNA from the nucleus.
b. After the 5’ cap is added, it migrates to the cytoplasm by diffusion.
c. After the poly-A tail is added, it binds to a protein for transport.
d. mRNA is released into the cytoplasm when the nuclear envelope dissolves.
c. After the poly-A tail is added, it binds to a protein for transport.
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Ambiguously worded answer choices _____.
Fill in the blank(s) with the appropriate word(s).
The muscle pictured above would most likely be found where in the body?
A. attached to the skeleton B. in the heart C. in the walls of the blood vessels D. in the intestines E. in the lungs
There are nine coat colors known in foxes. If a red
fox were crossed with a double-black fox, all the hybrids would be red above and black below in a pattern known as blended cross. If two blended crosses were mated, the F2 ratio would be as follows: 1 red, 2 smoky red, 2 cross red, 4 blended cross, 1 standard silver, 2 substandard silver, 1 Alaskan silver, 2 sub-Alaskan silver, and 1 double black. (a) Using the letters A/a and B/b to serve as the genes for these animals, develop a genotype for each variety listed. (b) Two crosses will produce all blended-cross offspring. One is used above (red fox x double black); what is the other? (c) List the genotype and phenotype of all the pure-breeding foxes. (d) Give the genotypic and phenotypic ratio of a cross between two substandard silvers. (e) Give the genotype and phenotype of the offspring produced in a cross of a sub-Alaskan silver and a cross red. What will be an ideal response?
Mitochondria are thought to have evolved from ancient bacteria. Which characteristics of a free-living bacteria have mitochondria lost over time?
A) an independent genome B) ribosomes C) phospholipid membranes D) motility E) ribosomes, phospholipid membranes, motility, and an independent genome