Which statement is NOT true of diffusion?
a. The process requires a concentration gradient.
b. The particles diffuse faster when the concentration gradient is steep.
c. The uncharged particles also move down electrical gradients.
d. Each particle moves down its own concentration gradient.
e. The process requires ATP.
ANSWER: e
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In the United States, most newborns undergo a test for primary congenital hypothyroidism, a condition where people are unable to produce enough thyroid hormone. On a nationwide basis, this is an example of
A. genetic testing. B. genetic screening C. amniocentesis. D. preimplantation genetic diagnosis.
The Hardy-Weinberg principle shows that if the population is large, inheritance alone does not cause changes in allele
frequency. _______ Indicate whether the statement is true or false.
If the diploid number of chromosomes in mouse somatic cells is 40, how many chromosomes are present during
prophase I?
a. 40, each comprised of a single paternal or maternal chromosome b. 80, each comprised of a pair of homologous chromosomes c. 20, each comprised of a single sister chromatid d. 80, each comprised of a single sister chromatid e. 40, each containing a pair of sister chromatids
Cardiac muscle cells
a. do not contract by a sliding filament mechanism. b. are similar to those of smooth muscle in being nonstriated. c. have fewer mitochondria than skeletal muscle cells do. d. possess numerous gap junctions on their sides, favoring rapid spread of excitation. e. have intercalated disks with tight junctions at their branching ends.