Evolution by natural selection, as conceived by Darwin, is based on all of the following EXCEPT
a. excess growth of populations
b. limitation of resources in the environment
c. Mendel's experiments with peas
d. variation within populations
e. some individuals have hereditary characteristics that allow them to survive and reproduce
more than others
C
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What is the role of the spindle fibers during mitosis?
A) They help separate the chromosomes. B) They break down the nuclear membrane. C) They duplicate the DNA. D) They make the chromosomes visible.
The combination of DNA and protein in the nucleus of a eukaryotic cell is called:
a. nucleoplasm b. plasmids c. nucleoids d. chromatin
Transfer RNA (tRNA) differs from other types of RNA because it:
A) carries the codons for amino acid sequence of a particular protein. B) carries an amino acid at one end of the molecule and binds with the mRNA with the anticodon at the other end. C) transfers genetic instructions from the cell nucleus to the cytoplasm. D) is made up of amino acids instead of nucleotides.
Which of the following statements most correctly describes meiosis?
(a) Meiosis involves two rounds of DNA replication followed by a single cell division. (b) Meiosis involves a single round of DNA replication followed by four successive cell divisions. (c) Meiosis involves four rounds of DNA replication followed by two successive cell divisions. (d) Meiosis involves a single round of DNA replication followed by two successive cell divisions.