When making a karyotype, what is the effect of placing lymphocytes in a low-salt solution?
A. It makes the chromosomes more visible.
B. It initiates cell division.
C. It stops the cells in metaphase.
D. It helps separate the chromosomes.
E. It causes the cells to swell.
E
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A plant seedling bends toward sunlight because _____
A) auxin migrates to the lower part of the stem due to gravity B) there is more auxin on the light side of the stem C) auxin is destroyed more quickly on the dark side of the stem D) auxin is found in greatest abundance on the dark side of the stem E) gibberellins produced at the stem tip cause phototropism
The DNA of two different viruses, A and B, are isolated and the melting point determined as shown here. Which one of the following is a conclusion consistent with the data?
A. Virus A is an animal virus and virus B is a bacterial virus (bacteriophage). B. Virus B is triplex DNA and virus A is duplex DNA. C. Virus B is an RNA-DNA duplex. D. Virus B has a higher percentage of guanine nucleotides compared to virus A. E. Virus A has a greater amount of methylated cytosines than virus B.
Assuming a single cross-over event, the completion of meiosis produces ____
a. three daughter cells with parental chromosomes and one daughter cell with a recombinant chromosome b. four daughter cells with recombinant chromosomes c. two daughter cells with parental chromosomes and two daughter cells with recombinant chromosomes d. one daughter cell with parental chromosomes and one cell with recombinant chromosomes e. two daughter cells, each with recombinant chromosomes
Honeybees have an incredible ability to distinguish thousands of different odorant molecules, using their large repertoire of olfactory receptors. A wide variety of different types of chemicals can be detected as odorants; they simply require olfactory neurons with a receptor that can bind the chemical and transduce that stimulus into a receptor potential.Because small quantities of powerful explosives can be hidden easily, a sensor that could detect trace amounts of illicit chemicals would be a useful tool. What animal sensory modality is exquisitely sensitive to minute quantities of airborne chemicals?
A. Taste B. Vision C. Touch D. Olfaction E. Hearing