Bees may pick up pollen of one species on a certain place on their bodies; if this area does not come into contact with the receptive structures of the flowers of another plant species, the pollen is not transferred. This is an example of
A. ecological isolation.
B. temporal isolation.
C. geographical isolation.
D. mechanical isolation.
Answer: D
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The frequency of sound waves reaching the ear determines:
A. intensity of sound B. loudness C. pitch D. tone
What are the properties of DNA probes?
I. They are labeled with a radioactive tracer. II. They are short chains of nucleotides. III. They match the targeted DNA sequence.
a. I and II b. II and III c. I only d. I, II, and III e. III only
Crossing over is one of the most important
events in meiosis because a. it produces new combinations of alleles on chromosomes. b. homologous chromosomes must be separated into different daughter cells. c. the number of chromosomes allotted to each daughter cell must be halved. d. homologous chromatids must be separated into different daughter cells. e. all of these reasons are true
Diana has been fasting for a few days and decides to go for a short run before breaking her fast. The glucose she needs for her run will come from________.
A. cellular respiration B. insulin C. glycolysis D. breaking glycogen down to small molecules E. breaking starch down to small molecules