Which description best describes the cell wall of a Gram-positive bacteria?
A. It is composed of a thick inner layer of peptidoglycan and a double layer of plasma membrane on the outside.
B. It is composed of a single plasma membrane and a thick outer layer of peptidoglycan.
C. It is composed of a single plasma membrane and a thin outer layer of cellulose.
D. It is composed of a double layer in the plasma membrane and a thin outer layer of peptidoglycan.
E. It is composed of a single plasma membrane and a thin outer layer of peptidoglycan.
Answer: B
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In human oogenesis, how many chromosomes does a secondary oocyte carry?
A) 22 B) 23 C) 44 D) 46 E) 92
The earliest photosynthesis probably occurred among ________
a. land plants b. prokaryotes in stromatolites c. prokaryotes at hydrothermal vents d. cyanobacteria floating in shallow seas
Which process results in microevolution without any form of natural selection?
a. genetic drift b. mutation c. development of new characteristics during an individual's lifetime d. genetic variation e. nonrandom mating
The bivalves and worms have red flesh due to presence of:
a. pigments absorbed from their prey items. b. hemoglobin. c. chromatophores. d. pigments similar to other deep-sea organisms due to a lack of light. e. structural colors for camouflage.