Where do the reactions of cellular respiration occur?
A) in the nucleolus of the nucleus
B) in the ribosomes of the rough endoplasmic reticulum
C) in the matrix of the mitochondria
D) in the hydrophobic core of the plasma membrane
C
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A change in nucleotide sequence that results in a change to a stop codon is known
A) nonsense mutation. B) silent mutation. C) missense mutation. D) frameshift mutation. E) transversion mutation.
Lymphoid tissues are always highly organized cellular complexes.
Answer the following statement true (T) or false (F)
Imagine in lemmings, that gray fur color (G) is dominant over white (g). There is another gene, called color, and individuals must have at least one color (C) allele for gray color to be expressed. A lemming that is heterozygous at both loci is crossed with a white lemming that is heterozygous for gray fur color. Which of the following is correct regarding their offspring?
A. All will be gray B. All will be white C. 3/8 will be gray, 5/8 will be white D. 1/4 will be gray, 3/4 will be white E. They will have a ratio of 9 gray:7 white
In early experiments to understand the control of the cell cycle, researchers fused HeLa cells that were at different
stages of the cell cycle. What did the results of these experiments suggest?
a. The concentrations of cyclin dependent kinases (Cdks) fluctuate throughout the cell cycle. b. The concentrations of cyclins fluctuate throughout the cell cycle. c. The cell cycle has three checkpoints through which the cell must pass in order to progress through to mitosis. d. Microtubules play an essential role in the progression of the cell cycle. e. Molecules in the cytoplasm control the progression of the cell cycle.