Genes in eukaryotic cells often have intronic sequences coded for within the DNA. These sequences are ultimately not translated into proteins. Why?
(a) Intronic sequences are removed from RNA molecules by the spliceosome, which works in the nucleus.
(b) Introns are not transcribed by RNA polymerase.
(c) Introns are removed by catalytic RNAs in the cytoplasm.
(d) The ribosome will skip over intron sequences when translating RNA into protein.
(a)
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The rusts of grain crops are good examples of ________.
A. basidiomycetes B. zygomycetes C. ascomycetes D. Rusts fall in several different fungal groupings.
Sister chromatids are best described as two chromosomes having
a. the same genes in the same order but possibly having different alleles of those genes. b. the same alleles of the same genes in a different order. c. different genes in the same order and possibly having different alleles of some genes. d. different alleles of the same genes arranged in a different order. e. an identical DNA sequence.
The teacher and class were especially saddened when the colonial hydrozoan died. They had watched it carefully, and the unfortunate creature never even got to produce offspring by budding
Yet, everyone was elated when one of the students noticed a small colonial hydrozoan growing in a part of the tank far from the location of the original colony. The teacher was apparently unaware that these hydrozoans exhibit _____. A) spontaneous generation B) abiogenesis C) alternation of generations D) a medusa stage
What is the relationship of bone marrow to the cardiovascular system?
A) Bone marrow breaks down old blood cells. B) Bone marrow produces red blood cells. C) Bone marrow helps keep the blood moving through the body. D) Bone marrow produces chemicals that help carry carbon dioxide in the blood.