Which of the following is an example of active transport across a membrane?
A. The movement of water from a nephron into the collecting duct of the kidney
B. The movement of glucose by facilitated diffusion into a liver cell
C. The movement of water from the inside of a cell into a surrounding hypertonic medium
D. The movement of Na+ into a neuron as a nerve impulse is generated
E. The movement of H+ into a thylakoid disc during photosynthesis
Ans: E. The movement of H+ into a thylakoid disc during photosynthesis
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Upper respiratory infectious agents are commonly transmitted from person to person
Indicate whether the statement is true or false.
What cytoskeletal protein is important to the function of the sperm cells illustrated in Figure 11.13?
A. microfilaments B. intermediate filaments C. microtubules D. All of the above are correct.
A major biological paradox is that genes are generally highly conserved and yet
A. there is very little difference among life forms existing today. B. there is so much diversity among life forms existing today. C. there are a huge number of ancestral genomes no matter how far back we look. D. there are essentially identical development patterns in all species. E. there is very little research into genomic sequences.
Males tend to be affected in greater numbers by X-linked recessive genetic disorders than are females
because a. females have two dominant genes for the disorder. b. males have only one X chromosomes. c. males have a double dose of the gene. d. Y chromosomes are not as strong as X chromosomes. e. females have two dominant genes for the disorder and males have only one recessive gene for the disorder.