What structural feature of a leaf enables it to obtain CO2 from the air?
A) Chloroplast B) Stomata C) Epidermis D) Cuticle E) Mesophyll
B
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The polymerase chain reaction (PCR) is a lab technique which ultimately results in which of the following?
a) the ability to transfer genes using plasmids b) a large clone library c) the isolation of a particular gene from a donor species d) the use of a radioactive probe to isolate a gene from a gene library e) duplication of a small strand of DNA into billions of copies
Hip dysplasia is a common ailment in large dog breeds including Rottweilers in the United
States. One breeder decides to import several females from Germany where the disease is less common to mate with his male dogs. This introduction of new alleles into his dog population is an example of __________.
a. natural selection b. adaptation c. gene flow d. dispersal
Why is fission likely to be a method of reproduction in early cells?
a. The easiest way to divide genetic material is to split it in two. b. Hypercycles that become unstable split apart. c. Modular genomes transfer well between cells. d. Physical constraints of a sphere cause it to become unstable and break when it becomes too big.
You examine cells with a microscope and detect two Barr bodies in each cell. What is the most likely genotype of the cells?
A) XX B) XY C) XO D) XXY E) XXX