Nitric oxide is a signal molecule that can
a. bind to surface receptors and activate second messengers.
b. bind to surface receptors and open ion channels.
c. diffuse across cell membranes and bind to receptors that regulate transcription.
d. diffuse across cell membranes and directly alter the activity of intracellular enzymes.
Ans: d. diffuse across cell membranes and directly alter the activity of intracellular enzymes.
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The greater fitness seen in species that reproduce sexually can be contributed to what?
a. Sexually reproducing species are typically born into stable environments so have greater fitness. b. Fewer offspring are born, so more care can be given to each offspring. c. Genetic diversity is created through sexual reproduction. d. Sexual reproduction has greater energy requirements. n
Only birds have _____
a. a cloaca c. feathers b. a four-chambered heart d. amniote eggs
Proteins are made up of many
a. RNA molecules only. b. DNA molecules only. c. RNA and DNA molecules. d. nucleotides. e. amino acids.
Some archaea can live in boiling water
Indicate whether the statement is true or false