Which of the following occurs during systole?
A. Both ventricles contract.
B. Both atria contract.
C. The left ventricle contracts.
D. The ventricles fill with blood.
E. The atria fill with blood.
A
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Cnidocytes are stinging cells that are characteristic of the phylum:
a. Porifera. b. Annelida. c. Echinodermata. d. Cnidaria. e. Ctenophora.
The type of contraception technique that prevents implantation (even after successful fertilization) is
a. tubal ligation. b. spermicidal jelly. c. birth control pills. d. intrauterine device. e. a diaphragm.
In one strand of a DNA molecule, adjacent nucleotides are joined by a(n) phosphodiester linkage
__________________ Indicate whether the statement is true or false.
Attached earlobes are recessive to free earlobes. What is the probability of having a child with attached earlobes when an individual with attached earlobes mates with an individual heterozygous for free earlobes?
A) 0% B) 25% C) 50% D) 75%