In cloning a fragment of DNA, why is a vector necessary?
What will be an ideal response?
Ans: The vector allows a DNA insert containing the region of interest to be replicated and propagated to daughter cells following cell division. The vector may also contain regions that allow selection of successfully transformed cells, or that allow detection of the presence of a DNA insert.
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Seedless vascular plants of the ________ period formed the world's coal, oil, and natural gas deposits.
A. Carboniferous B. Cambrian C. Cretaceous D. Jurassic E. Quaternary
Which of the following types of information would be most useful in an effort to move a DNA fragment from one plasmid vector to another, using molecular cloning techniques?
A. Data from cloning of Dolly the sheep B. DNA fingerprint data C. Restriction maps of the plasmids D. Sequence of PCR primers
In some human populations, the proportion of individuals who are heterozygous for the sickle cell allele is much higher than would be expected by chance alone. Why?
A. Individuals with two harmful alleles have an advantage over individuals with two normal alleles. B. Heterozygous individuals have an advantage over individuals with two normal alleles. C. Individuals with two normal alleles have an advantage over heterozygous individuals. D. Individuals with two harmful alleles have an advantage over heterozygous individuals.
Which two cell structures work together in the process of protein synthesis
(1) nucleus and chloroplast (2) ribosome and vacuole (3) nucleus and ribosome (4) mitochondrion and cell membrane