Offspring are produced when male and female gametes combine. Which process produces the gametes used for reproduction?
A) binary fission
B) fertilization
C) mitosis
D) meiosis
Answer: D) meiosis
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The linkage of one amino acid to another amino acid in a protein is most accurately referred to as a(n):
a. peptide bond b. glycosidic bond c. ionic bond d. R-group e. phosphodiester bond
How many different species of organisms do scientists believe exist on earth today?
A. 10 million B. 1.5 million C. 1 billion D. 10,000
DNA is composed of four nucleotides, A, C, G and T. Each codon is composed of three nucleotides. The number of possible codons is
A) 16. B) 4. C) 12. D) 64. E) 32.
Why is ATP needed for muscle contraction?
A) It's needed for calcium release from the sarcoplasmic reticulum. B) Myosin must contact the actin filament and move to pull it toward the midline of the sarcomere. C) It causes calcium to bind to troponin. D) It causes tropomyosin to slide off the myosin-binding sites of actin.