The mechanism of DNA synthesis differs between the two new daughter strands during replication. This is due to the fact that
A. the DNA strands run antiparallel to each other and the DNA polymerase can only add nucleotides to the 3' end of the growing strand.
B. both daughter strands can't extend toward the replication fork because there would not be room for two DNA polymerase enzymes.
C. one RNA primer attaches to the 5' end of the parent strand and the other primer to the 3' end.
D. both RNA primers attach to the 3' end of the template strands, which are at opposite ends from each other.
Answer: A
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Which of the following represents the correct sequence of events for sexual reproduction in most vertebrates?
A) mitosis ? zygote ? meiosis ? gametes ? embryo B) meiosis ? zygote ? mitosis ? gametes ? embryo C) mitosis ? gametes ? meiosis ? zygote ? embryo D) meiosis ? gametes ? mitosis ? zygote ? embryo E) meiosis ? gametes ? zygote ? mitosis ? embryo
____ are cells that lay the framework for new phloem and xylem in vascular plants. Prior to the differentiation of these cells, their precursors transported auxin out of immature leaves
Fill in the blank with the appropriate word.
A multigene family is composed of _____
A) multiple genes whose products must be coordinately expressed B) genes whose sequences are very similar and that probably arose by duplication C) a gene whose exons can be spliced in a number of different ways D) a highly conserved gene found in a number of different species
When the DNA in a cell is uncoiled and spread throughout the nucleus, it is called
A) a chromosome. B) a centromere. C) chromatin. D) a chromatid.