Recessive traits are expressed only in the homozygous state
a. True
b. False
Indicate whether the statement is true or false
True
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Which of the following does not reflect the action of an effector molecule on the transcription of a gene?
A. An effector binds to a repressor to decrease the level of transcription. B. An effector binds to a repressor to increase the level of transcription. C. An effector binds to an activator to increase the level of transcription. D. An effector binds to a polymerase to increase the level of transcription.
The high diversity of pigeons in Papua New Guinea’s tropical rain forests is possible because:
1.They occupy very different niches, so have different forms.
2.Predation of one species by another has diversified their forms.
3.They are able to take advantage of the diversity of food-bearing trees in the forest.
4.They are symbiotic species so size difference does not matter.
Genetically modifying human ________ cells may directly affect future generations
A) intestinal B) immune C) gametic D) somatic
The major difference between protostome animals and deuterostome animals is _______.
a) whether or not they reproduce sexually or asexually b) the presence or absence of a gastrovascular cavity c) which opening to the digestive system forms first d) their type of symmetry