7. Which of the following is the key factor driving cellular differentiation in the body? A. Chemical gradients in the c

[answerhappygod]

7. Which of the following is the key factor driving
cellular differentiation in the body?
A. Chemical gradients in the cellular environment
B. Systemic hormonal influences
C. Rate of transcription
D. Cellular nutritional status
41. A researcher decides to repeat experiments and
reassess results first established in the 1930s for why plants grow
toward light. Which of the following is the best reason for
conducting this experiment?
A. Plant behavior could have modified due to evolutionary
processes since the experiment was first done
B. New breeds of plants discovered since the 1930s have not yet
been shown to have the same light responses
C. Shifts in average temperatures produced by global warming may
affect plants in ways that are not yet understood
D. Equipment and methods developed since the 1930s may produce
better data and provide mechanistic detail
49. Steps involved in natural selection
include:
1. Preservation of genes of best-adapted offspring
2. Overproduction of offspring with variation in traits
3. Differential survival in the face of environmental
challenges
Which of the following is the sequence in which these steps take
place?
A. 3, 2, 1
B. 1, 3, 2
C. 2, 1, 3
D. 2, 3, 1
51. Which of the following is the role of adenosine
triphosphate (ATP) in human cells?
A. Transporting chemical energy within cells for metabolism
B. Carrying enriched oxygen from the cell membrane to the cell
nucleus
C. Catalyzing the release of calcium in muscle cells
D. Preventing the reabsorption of CO2 during cell metabolism