21
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According to the endosymbiotic theory, which cellular process was involved in the evolution of mitochondria and chloroplasts?
A
symbiosisB
phagocytosisC
endosymbiosisD
photosynthesis22
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Which best defines a diploid cell during meiosis?
A
a cell that has double the number of chromosomes as the parent cellB
a cell that has half the number of chromosomes as the parent cellC
a cell that has double the number of chromosomes as the daughter cellD
a cell that has half the number of chromosomes as the daughter cell23
Which series of diagrams correctly represents the order of mitosis?
A
The steps of mitosis are shown. In step 1, the cell starts to break down structures. In step 2, the chromosomes line up at the center. In step 3, the chromatids separate from each other and are pulled to opposite ends of the cell. In step 4, the cell is divided.
B
The steps of mitosis are shown. In step 1, the cell starts to break down structures. In step 2, the cell is divided. In step 3, the chromatids separate from each other and are pulled to opposite ends of the cell. In step 4, the chromosomes line up at the center.
C
The steps of mitosis are shown. In step 1, the cell starts to break down structures. In step 2, the cell is divided. In step 3, the chromosomes line up at the center. In step 4, the chromatids separate from each other and are pulled to opposite ends of the cell.
D
The steps of mitosis are shown. In step 1, the cell starts to break down structures. In step 2, the chromatids separate from each other and are pulled to opposite ends of the cell. In step 3, the chromosomes line up at the center. In step 4, the cell is divided.
24
What purpose does the peptide bond serve in protein synthesis?
A
It connects amino acids.B
It adds a water molecule to the amino acid chain.C
It releases the protein from the tRNA.D
It makes a strand of mRNA.25
A lion eating a zebra is an example of which characteristic of life?
A
having cellsB
responding to the environmentC
using energyD
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