During protein synthesis in eukaryotes, which molecule passes from the nucleus to the cytoplasm and specifies the sequence of amino acids in the new polypeptide?
A. rRNA
B. tRNA
C. mRNA
D. DNA
E. RNA polymerase
Answer: C
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Infertility and spontaneous abortion increase with age primarily due to
A) uterine fibroids. B) endometriosis. C) highly acidic or basic vaginal secretions. D) higher production of oocytes with abnormal chromosome numbers.
The ability of bacteria to transfer DNA from one individual to another in the same generation is called ________
a. vertical gene transfer b. mitosis c. meiosis d. horizontal gene transfer e. binary fission
The first level of compaction of DNA consists of
A) DNA winding around histones to form small nucleosomes. B) tight coiling of DNA with nucleosomes into higher order structures. C) compaction into metaphase chromosomes. D) histone, DNA, and nonhistone covalent bonding.
Which of the following ideas was most commonly held in the eighteenth century?
A. the fixity of species B. genetic change through mutation C. changes in a species through adaptation to the environment D. evolution by natural selection over time