Which of the following statements is false?
a. Cell migration during embryonic development is
an example of chemotaxis.
b. Embryonic neurons follow adhesive cells as they
migrate.
c. Cells continue migrating throughout the entire
embryonic process.
d. Morphogenesis depends upon local growth.
e. Controlled cell death can be involved in
morphogenesis.
Answer: c
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In the United States, about __________ teenagers
join the ranks of habitual smokers each day. a. 1,000 b. 2,000 c. 3,000 d. 4,000 e. 5,000
In a reflex arc, where does the synapse between a sensory neuron and a motor neuron occur?
a. in the brain b. between the receptor and the spinal cord c. within a muscle d. within the spinal cord e. in the nerve leading to the spinal cord
A woman is diagnosed to have a gene for the genetic
disorder known as Huntington disease. It is a rare defect caused by an autosomal dominant allele. The chance for any one of her children to inherit the gene is a. dependent on the sex of the child. b. 1/3. c. 1/2. d. 3/4. e. 1.00 (or 100 percent).
How do researchers in the metagenomics sector operate?
A) They study Mendelian traits in children. B) They link diseases by shared gene expression. C) They detect mutations in the protein encoding part of an individual's genome by using powerful algorithms. D) They collect and sequence DNA, then consult databases of known genomes to imagine what the organisms to which the DNA belongs might be like.