Which of the following statements correctly describes some aspect of protein secretion from prokaryotic cells?
A) Prokaryotes cannot secrete proteins because they lack an endomembrane system.
B) The mechanism of protein secretion in prokaryotes is probably the same as that in eukaryotes.
C) Proteins secreted by prokaryotes are synthesized on ribosomes bound to the cytoplasmic surface of the plasma membrane.
D) Prokaryotes cannot secrete proteins because they lack ribosomes.
C
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Which of the following can be sensed by plants?
I) gravity II) pathogens III) wind IV) light A) only I and III B) only III and IV C) only I, II, and IV D) only II, III, and IV E) I, II, III, and IV
Chromosome segregation in metaphase I
refers to which of the following statements? a. The position where crossing over occurs is random. b. The pole that any one chromosome moves toward is completely independent of the movement of the other 45 chromosomes in humans. c. Either partner of a homologous pair of chromosomes may end up at either spindle pole. d. The sperm that fertilizes the egg is selected at random. e. None of these refer to independent assortment.
Which of the following is NOT one of the types of variation that occurs within individuals?
A) genetic variation B) environmental variation C) normalizing variation D) genotype-by-environment variation
All of the following were produced in experiments on primitive Earth conditions conducted by Miller-Urey and others, except for
A. prokaryotes. B. amino acids. C. organic molecules. D. urea. E. hydrogen cyanide.