Which of the following would not be a study of an organism in its natural environment?
a. a copperhead snake in an eastern deciduous forest
b. a fruit fly at a picnic
c. a child in a park
d. a clown fish in an aquarium
e. a lion on the African savanna.
D
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A friend who is not a biologist tells you that she grows irises from iris roots. You explain to her that the "root" she is planting is not a root, but instead is called a rhizome. "Why?" she asked. You explain:
A. "A root grows vertically, not horizontally." B. "A rhizome has nodes and internodes and is really a modified stem that can exist underground." C. "A root stores nutrients, but rhizomes are underground stems that do not store nutrients." D. "A rhizome, although a modified stem, acts as a root does. In other words a rhizome is a stem-root combination." E. "A rhizome is a modified root that is able to grow leaves."
Mutation of a mouse gene results in mice that lack heart muscle. What characteristic would you expect to find in a human gene that has a common origin with this mouse gene?
A) The DNA sequence of the human gene will be identical to the DNA sequence of the mouse gene. B) The human and mouse genes will specify proteins with similar amino acid sequences. C) The human and mouse genes will specify unrelated sequences of amino acids, but both proteins will function to prevent the formation of heart muscle. D) The human and mouse genes will specify unrelated sequences of amino acids, and the human gene will not be involved in heart muscle formation.
Which of the following statements is true?
a. Although hormones are carried to all parts of the body, they produce effects only in cells with proper receptors. b. Hormones are limited to steroid compounds. c. Hormones are secreted by specialized exocrine glands. d. Most hormones are controlled by positive feedback mechanisms involving the pituitary gland. e. Target cell response to the secretion of a hormone is as rapid as an effector response in the nervous system.
What type(s) of bonds link together the components of a ribosome?
A.) only the types of bonds that involve the sharing of electrons between atoms B.) both the types of bonds that involve the sharing of electrons between atoms and the types of bonds that involve electrostatic interactions between atoms C.) neither the types of bonds that involve the sharing of electrons between atoms nor the types of bonds that involve electrostatic interactions between atoms D.) only the types of bonds that involve electrostatic interactions between atoms