Select the statement that describes the stability of DNA and RNA under typical cellular conditions.
A) Double-stranded DNA in the nucleus and single-stranded RNA in the cytoplasm are equally stable.
B) Double-stranded DNA in the nucleus is more stable than single-stranded RNA in the cytoplasm.
C) Single-stranded RNA in the cytoplasm is more stable than double-stranded DNA in the nucleus.
D) Both RNA in the cytoplasm and double-stranded DNA in the nucleus can never be degraded within a cell.
B) Double-stranded DNA in the nucleus is more stable than single-stranded RNA in the cytoplasm.
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What features of meiosis allow for independent assortment of chromosomes?
A. random alignment of homologous sister chromatids on the metaphase plate B. separation of sister chromatids C. reduction of chromosome number from diploid to haploid D. both the separation of sister chromatids and the reduction of chromosome number from diploid to haploid E. All of these features allow for the independent assortment of chromosomes.
Evidence of a direct relationship between genes and enzymes, including development of the one geneone
enzyme hypothesis, came from studies conducted by ____ of arginine biosynthesis in mutant stains of Neurospora.
a. Beadle and Tatum b. Griffith c. Watson and Crick d. Garrod e. Nirenberg and Leder
Plants that reproduce asexually might produce identical progeny from all of the following except
A. portions of roots B. portions of stem C. portions of leaves D. pollen grains
There are two properties of phospholipids that affect how tightly they pack together: the length of the hydrocarbon chain and the number of double bonds
The degree of packing, in turn, influences the relative mobility of these molecules in the membrane. Which of the following would yield the most highly mobile phospholipid (listed as number of carbons and number of double bonds, respectively)? (a) 24 carbons with 1 double bond (b) 15 carbons with 2 double bonds (c) 20 carbons with 2 double bonds (d) 16 carbons with no double bonds