What is the leading hypothesis for what might have brought about the extinction of the dinosaurs?
A) A new disease
B) Competition from mammals
C) An asteroid impact
D) Massive volcano eruptions
C
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Which statement about gene mutations is FALSE?
a. All mutations are transmitted to the next generation. b. Mutations are rare but their rates can be predicted. c. Mutations with beneficial effects will be favored by natural selection. d. Many mutations reduce an individual's chance of surviving and reproducing. e. Mutations with neutral effects neither help nor hurt the individual.
Which of the following is NOT essential to
reproduction? a. ovary b. oviduct c. clitoris d. vagina e. uterus
Catalysts will ______________ activation energy of a reaction.
Fill in the blank(s) with the appropriate word(s).
____ carries protein assembly instructions from the nucleus to the cytoplasm.
A. Template DNA B. Messenger RNA C. Transfer RNA D. Ribosomal RNA E. Total RNA