Question
Which cell component arose first during the formation of the earliest cells?
A. Chloroplast
B. Plasma membrane
C. Mitochondria
D. Cell wall
Answer/Explanation
Question
In the chimpanzee (Pan troglodytes), the haploid number of chromosomes is 24. How many
sister chromatids are present in the G2 phase of a somatic cell, such as a cell in the bone marrow
of the chimpanzee?
A. 12
B. 24
C. 48
D. 96
Answer/Explanation
Question
What are linked by hydrogen bonds?
A. Hydrogen and oxygen within a water molecule
B. Phosphate and sugar within a DNA molecule
C. Base and sugar between DNA nucleotides
D. Hydrogen and oxygen in different water molecules
Answer/Explanation
Question
Pasteur used swan-necked flasks and a nutrient broth to demonstrate that spontaneous generation
of organisms does not occur on Earth. Some students performed a similar experiment using two
swan-necked flasks, one containing broth which had been previously boiled and another containing
broth which had not been boiled.
The flasks were left in the school laboratory and observed after one week. What is the evidence
against the spontaneous generation theory?
A. Microorganisms died in flask F due to high temperatures.
B. No microorganisms grew in either flask.
C. Microorganisms grew in flask G.
D. No microorganisms grew in flask F but many grew in flask G.