The progression of your garden from sunflowers to birch trees is an example of:
A. succession.
B. evolution.
C. ecology.
D. competition.
E. None of the responses is correct.
A
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A molecular biologist is interested in purify a recombinant protein by His-tagging, but the protein and vector both lack histidine residues. In this case, the molecular biologist could use which of the following technique(s) to achieve purification?
A. Amplify the histidine-encoding sequence by PCR and add it to the gene of interest. B. Add a 6xHis-tag to the C-terminus of the protein. C. Add a series of histidine residues to the N-terminus of the protein. D. All of the choices are correct.
Muscle samples are taken from two groups of men. One group performs regular intense aerobic exercise. The second group is sedentary and does not exercise. When you compare their muscle samples at the microscopic level, you expect to find that the exercising men show increases in
A. Golgi apparatus. B. capillary density. C. smooth endoplasmic reticulum. D. mitochondria. E. mitochondria and capillary density.
Which of the following characteristics of genetic material accounts for the need to get a flu vaccine every year, but a polio vaccine once in a life time?
A. Information. B. Replication. C. Transmission. D. Replication and Transmission. E. Variation.
In human chromosomes, satellite DNA sequences of about 170 base pairs in length are present in tandem arrays of up to 1 million base pairs. Found mainly in centromere regions, these DNA sequences are called ________
A) telomere-associated sequences B) euchromatic regions C) telomeres D) primers E) alphoid families