Which of the following does NOT describe modern, living cells?
a. a semi-permeable membrane keeping the internal environment of the cell separate from
the external environment
b. nucleic acids linked in a sequence to form at least one large molecule
c. a requirement for the nucleic acids to be contained behind a nuclear membrane
d. multiple pathways for converting energy from one form into another
e. a method of converting the nucleic acid sequences into proteins
C
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Which of the following statements best compares the pedicel and receptacle?
A. The pedicel and receptacle are identical, merely two names for the same structure. B. The pedicel is haploid and the receptacle is diploid. C. The pedicel is a reproductive part of a flower and the receptacle is a vegetative part. D. The receptacle is the part of the flower that receives the pollen whereas the pedicel relays sperm to the ovule. E. The pedicel is the tip of the stem bearing the flower and the receptacle is the base of the flower.
When does the human body produce the most lactic acid?
a. after falling into a deep sleep b. during prolonged exercise c. after eating a large meal d. while drinking a glass of milk
The presence of a contractile vacuole indicates that a single-celled protist _____
a. is marine c. is photosynthetic b. lives in fresh water d. secretes a toxin
In a cell membrane, the phospholipid heads are ____
a. hydrophobic b. nonpolar c. dissolved in the cell’s watery interior d. sandwiched between the phospholipid tails e. formed by fatty acids