Even though the autumn may be unusually warm, the leaves from deciduous trees begin to drop during September. Which of the following is the best explanation?
A. The trees are responding to shorter days.
B. The autumn months are usually wetter because the summer rains were delayed.
C. The effects of phototropism are operating “right on schedule.”
D. There is not enough sunlight to carry on photosynthesis any longer.
E. The trees are responding to consistent temperatures.
Answer: A
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Which of the following is a characteristic of the set of genes in an operon that is not true of a regulon?
A. Transcription can produce long polycistronic mRNA that contains multiple genes in each transcript. B. Each gene of the set usually contains its own Shine-Dalgarno sequence. C. Regulation of gene expression can occur through activation or repression mechanisms. D. All of the genes in the set are controlled by a single promoter.
Vertebrae of the spinal cord are separated from each other by compressible, flat structures called ________ disks
Fill in the blank(s) with correct word
Semiconservative DNA replication means that
A. each daughter DNA molecule is composed of one original strand and one new strand. B. nucleotides are constantly being recycled as cells make DNA. C. the cell can proofread its newly synthesized DNA only part of the time. D. the sequence of a DNA molecule is preserved as it is being replicated. E. each strand of a double-stranded DNA molecule is replicated differently.
If you weigh yourself on a scale one morning, then eat four pounds of food during the day, will you weigh four pounds more the next morning? Why or why not? (Hint: What happens to the atoms from the food you ingested?)
What will be an ideal response?